{"source":"polymarket","id":"1004187","ticker":"which-cities-face-tornado-risk-on-september-11-2026","slug":"which-cities-face-tornado-risk-on-september-11-2026","title":"Which cities face tornado risk on September 11?","description":"This market will resolve to \"Yes\" for each listed city that falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If a city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","active":true,"closed":false,"start_date":"2026-09-11T12:13:12Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":1283.8682,"volume_24hr":1283.8682,"volume_24h_change":null,"normalized_vol_24hr":18.359827041625977,"normalized_volume":11.655694961547852,"liquidity":1131.27251,"open_interest":1258.868199,"categories":["Climate and Weather"],"tags":[{"id":"84","slug":"weather","label":"Weather"},{"id":"101757","slug":"recurring","label":"Recurring"},{"id":"106118","slug":"tornado-risk","label":"Tornado Risk"}],"synthetic":false,"is_group":false,"group_key":null,"parent_event_id":null,"probability":null,"spread":null,"top_outcome":"Nashville, TN","top_outcome_probability":0.4995,"top_outcome_prob_24h_change":0.0,"top_outcome_volume_24h_change":0.0,"updated_at":"2026-09-11T23:59:45.980739Z","fetched_at":"2026-09-11T23:59:45.980739Z","added_at":"2026-09-11T12:22:45.666273Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026","chart_24h":[0.0,102.0202,102.0202,229.1322,326.0622,326.0622,535.2322,582.8522,679.7822,779.7822,839.7822,886.1022,1192.4382,1263.8682,1263.8682,1263.8682,1263.8682,1283.8682],"kind":"live","markets":[{"source":"polymarket","id":"4465941","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-columbus-oh","question":"Will Columbus, OH face tornado risk on September 11?","group_item_title":"Columbus, OH","description":"This market will resolve to \"Yes\" if Columbus, OH falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 39.9612, -82.9988 for Columbus, OH.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.499,0.501],"probability":0.499,"spread":0.978,"active":true,"closed":false,"start_date":"2026-09-11T12:13:17Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":102.112,"volume_24hr":102.112,"prob_24h_change":0.0040000000000000036,"volume_24h_change":102.112,"normalized_vol_24hr":8.740213394165039,"normalized_volume":6.305224418640137,"liquidity":3.67102,"categories":["Climate and Weather"],"countries":["United States"],"updated_at":"2026-09-11T23:40:35.868778Z","fetched_at":"2026-09-11T23:40:35.868778Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-columbus-oh","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.495,0.5,0.4995,0.4995,0.5,0.014,0.024,0.0125,0.012,0.4995,0.4995,0.013,0.012,0.499,0.0115,0.011,0.0115,0.499]},{"source":"polymarket","id":"4465955","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-tampa-fl","question":"Will Tampa, FL face tornado risk on September 11?","group_item_title":"Tampa, FL","description":"This market will resolve to \"Yes\" if Tampa, FL falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 27.9506, -82.4572 for Tampa, FL.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.4985,0.5015],"probability":0.4985,"spread":0.975,"active":true,"closed":false,"start_date":"2026-09-11T12:13:20Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":20.0,"volume_24hr":20.0,"prob_24h_change":0.4735,"volume_24h_change":20.0,"normalized_vol_24hr":3.7697110176086426,"normalized_volume":2.719484329223633,"liquidity":4.29803,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:40:35.868778Z","fetched_at":"2026-09-11T23:40:35.868778Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-tampa-fl","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.025,0.0255,0.4995,0.0255,0.0155,0.499,0.0135,0.498,0.0115,0.0115,0.012,0.498,0.4985,0.0115,0.012,0.0135,0.4985]},{"source":"polymarket","id":"4465949","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-atlanta-ga","question":"Will Atlanta, GA face tornado risk on September 11?","group_item_title":"Atlanta, GA","description":"This market will resolve to \"Yes\" if Atlanta, GA falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 33.749, -84.388 for Atlanta, GA.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.026,0.974],"probability":0.026,"spread":0.026,"active":true,"closed":false,"start_date":"2026-09-11T12:13:18Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":46.32,"volume_24hr":46.32,"prob_24h_change":-0.469,"volume_24h_change":46.32,"normalized_vol_24hr":6.0499796867370605,"normalized_volume":4.364479064941406,"liquidity":21.559,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:21:22.750357Z","fetched_at":"2026-09-11T23:21:22.750357Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-atlanta-ga","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.495,0.025,0.0255,0.026,0.0265,0.026,0.017,0.0265,0.027,0.0385,0.0385,0.026,0.0145,0.026,0.0145,0.026]},{"source":"polymarket","id":"4465951","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-omaha-ne","question":"Will Omaha, NE face tornado risk on September 11?","group_item_title":"Omaha, NE","description":"This market will resolve to \"Yes\" if Omaha, NE falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 41.2565, -95.9345 for Omaha, NE.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.026,0.974],"probability":0.026,"spread":0.026,"active":true,"closed":false,"start_date":"2026-09-11T12:13:12Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":91.43,"volume_24hr":91.43,"prob_24h_change":0.0009999999999999974,"volume_24h_change":91.43,"normalized_vol_24hr":8.332695007324219,"normalized_volume":6.0112385749816895,"liquidity":20.095,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:21:22.750357Z","fetched_at":"2026-09-11T23:21:22.750357Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-omaha-ne","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.025,0.0255,0.025,0.5,0.0265,0.026,0.0265,0.0265,0.031,0.0265,0.026,0.0265,0.026,0.026,0.0165,0.0145,0.026]},{"source":"polymarket","id":"4465937","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-san-antonio-tx","question":"Will San Antonio, TX face tornado risk on September 11?","group_item_title":"San Antonio, TX","description":"This market will resolve to \"Yes\" if San Antonio, TX falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 29.4241, -98.4936 for San Antonio, TX.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.02,0.987],"probability":0.02,"spread":0.02,"active":true,"closed":false,"start_date":"2026-09-11T12:13:16Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":102.112,"volume_24hr":102.112,"prob_24h_change":-0.475,"volume_24h_change":102.112,"normalized_vol_24hr":8.740213394165039,"normalized_volume":6.305224418640137,"liquidity":60.2069,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:21:22.750357Z","fetched_at":"2026-09-11T23:21:22.750357Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-san-antonio-tx","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.495,0.025,0.025,0.02,0.0205,0.02,0.015,0.02,0.0205,0.0205,0.0205,0.02,0.013,0.02]},{"source":"polymarket","id":"4465939","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-austin-tx","question":"Will Austin, TX face tornado risk on September 11?","group_item_title":"Austin, TX","description":"This market will resolve to \"Yes\" if Austin, TX falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 30.2672, -97.7431 for Austin, TX.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.02,0.98],"probability":0.02,"spread":0.02,"active":true,"closed":false,"start_date":"2026-09-11T12:13:15Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":86.67,"volume_24hr":86.67,"prob_24h_change":-0.475,"volume_24h_change":86.67,"normalized_vol_24hr":8.139169692993164,"normalized_volume":5.871628284454346,"liquidity":21.499,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T22:43:57.284460Z","fetched_at":"2026-09-11T22:43:57.284460Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-austin-tx","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.495,0.02,0.0205,0.0205,0.021,0.015,0.02,0.013,0.02]},{"source":"polymarket","id":"4465944","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-denver-co","question":"Will Denver, CO face tornado risk on September 11?","group_item_title":"Denver, CO","description":"This market will resolve to \"Yes\" if Denver, CO falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 39.7392, -104.9903 for Denver, CO.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.02,0.98],"probability":0.02,"spread":0.02,"active":true,"closed":false,"start_date":"2026-09-11T12:13:19Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":102.112,"volume_24hr":102.112,"prob_24h_change":-0.005000000000000001,"volume_24h_change":102.112,"normalized_vol_24hr":8.740213394165039,"normalized_volume":6.305224418640137,"liquidity":60.1669,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:21:22.750357Z","fetched_at":"2026-09-11T23:21:22.750357Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-denver-co","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.025,0.0255,0.025,0.02,0.0205,0.02,0.015,0.02,0.0205,0.0205,0.0205,0.02,0.013,0.013,0.02]},{"source":"polymarket","id":"4465946","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-oklahoma-city-ok","question":"Will Oklahoma City, OK face tornado risk on September 11?","group_item_title":"Oklahoma City, OK","description":"This market will resolve to \"Yes\" if Oklahoma City, OK falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 35.4676, -97.5164 for Oklahoma City, OK.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.02,0.98],"probability":0.02,"spread":0.02,"active":true,"closed":false,"start_date":"2026-09-11T12:13:22Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":102.112,"volume_24hr":102.112,"prob_24h_change":-0.475,"volume_24h_change":102.112,"normalized_vol_24hr":8.740213394165039,"normalized_volume":6.305224418640137,"liquidity":79.5669,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:21:22.750357Z","fetched_at":"2026-09-11T23:21:22.750357Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-oklahoma-city-ok","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.495,0.025,0.025,0.02,0.0205,0.02,0.015,0.02,0.0205,0.0205,0.0205,0.02,0.013,0.02]},{"source":"polymarket","id":"4465952","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-minneapolis-mn","question":"Will Minneapolis, MN face tornado risk on September 11?","group_item_title":"Minneapolis, MN","description":"This market will resolve to \"Yes\" if Minneapolis, MN falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 44.9778, -93.265 for Minneapolis, MN.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.0195,0.9805],"probability":0.0195,"spread":0.001,"active":true,"closed":false,"start_date":"2026-09-11T12:13:20Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":25.0,"volume_24hr":25.0,"prob_24h_change":-0.4805,"volume_24h_change":25.0,"normalized_vol_24hr":4.317154884338379,"normalized_volume":3.114412307739258,"liquidity":31.54316,"categories":["Climate and Weather"],"countries":["United States"],"updated_at":"2026-09-11T22:05:37.941682Z","fetched_at":"2026-09-11T22:05:37.941682Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-minneapolis-mn","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.5,0.015,0.016,0.016,0.0165,0.016,0.0175,0.0155,0.018,0.0195]},{"source":"polymarket","id":"4465935","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-chicago-il","question":"Will Chicago, IL face tornado risk on September 11?","group_item_title":"Chicago, IL","description":"This market will resolve to \"Yes\" if Chicago, IL falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 41.8781, -87.6298 for Chicago, IL.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.017,0.983],"probability":0.017,"spread":0.01,"active":true,"closed":false,"start_date":"2026-09-11T12:13:18Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":178.9502,"volume_24hr":178.9502,"prob_24h_change":-0.478,"volume_24h_change":178.9502,"normalized_vol_24hr":10.966116905212402,"normalized_volume":7.910999298095703,"liquidity":119.58676,"categories":["Climate and Weather"],"countries":["United States"],"updated_at":"2026-09-11T17:33:16.458201Z","fetched_at":"2026-09-11T17:33:16.458201Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-chicago-il","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.495,0.0295,0.4955,0.4955,0.017,0.017,0.017,0.017]},{"source":"polymarket","id":"4465940","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-fort-worth-tx","question":"Will Fort Worth, TX face tornado risk on September 11?","group_item_title":"Fort Worth, TX","description":"This market will resolve to \"Yes\" if Fort Worth, TX falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 32.7555, -97.3308 for Fort Worth, TX.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.017,0.983],"probability":0.017,"spread":0.014,"active":true,"closed":false,"start_date":"2026-09-11T12:13:22Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":40.0,"volume_24hr":40.0,"prob_24h_change":-0.478,"volume_24h_change":40.0,"normalized_vol_24hr":5.608586311340332,"normalized_volume":4.046056270599365,"liquidity":21.9776,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:21:22.750357Z","fetched_at":"2026-09-11T23:21:22.750357Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-fort-worth-tx","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.495,0.5,0.4995,0.5,0.017,0.015,0.017,0.0215,0.017,0.013,0.017]},{"source":"polymarket","id":"4465942","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-charlotte-nc","question":"Will Charlotte, NC face tornado risk on September 11?","group_item_title":"Charlotte, NC","description":"This market will resolve to \"Yes\" if Charlotte, NC falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 35.2271, -80.8431 for Charlotte, NC.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.017,0.983],"probability":0.017,"spread":0.014,"active":true,"closed":false,"start_date":"2026-09-11T12:13:21Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":67.62,"volume_24hr":67.62,"prob_24h_change":-0.478,"volume_24h_change":67.62,"normalized_vol_24hr":7.272096633911133,"normalized_volume":5.246119022369385,"liquidity":21.90886,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:40:35.868778Z","fetched_at":"2026-09-11T23:40:35.868778Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-charlotte-nc","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.495,0.5,0.4995,0.5,0.017,0.02,0.022,0.022,0.017]},{"source":"polymarket","id":"4465943","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-indianapolis-in","question":"Will Indianapolis, IN face tornado risk on September 11?","group_item_title":"Indianapolis, IN","description":"This market will resolve to \"Yes\" if Indianapolis, IN falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 39.7684, -86.1581 for Indianapolis, IN.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.0165,0.9835],"probability":0.0165,"spread":0.013,"active":true,"closed":false,"start_date":"2026-09-11T12:13:18Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":96.93,"volume_24hr":96.93,"prob_24h_change":-0.4785,"volume_24h_change":96.93,"normalized_vol_24hr":8.546865463256836,"normalized_volume":6.165741920471191,"liquidity":41.119,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:21:22.750357Z","fetched_at":"2026-09-11T23:21:22.750357Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-indianapolis-in","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.495,0.5,0.4995,0.0255,0.0165,0.015,0.0165,0.013,0.0165]},{"source":"polymarket","id":"4465956","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-st-louis-mo","question":"Will St. Louis, MO face tornado risk on September 11?","group_item_title":"St. Louis, MO","description":"This market will resolve to \"Yes\" if St. Louis, MO falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 38.627, -90.1994 for St. Louis, MO.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.016,0.984],"probability":0.016,"spread":0.008,"active":true,"closed":false,"start_date":"2026-09-11T12:13:23Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":20.0,"volume_24hr":20.0,"prob_24h_change":-0.4835,"volume_24h_change":20.0,"normalized_vol_24hr":3.7697110176086426,"normalized_volume":2.719484329223633,"liquidity":32.29918,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:21:22.750357Z","fetched_at":"2026-09-11T23:21:22.750357Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-st-louis-mo","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.4995,0.5,0.4995,0.5,0.0255,0.025,0.016,0.025,0.029,0.0255,0.0255,0.0255,0.025,0.025,0.0255,0.016,0.0135,0.016]},{"source":"polymarket","id":"4465959","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-little-rock-ar","question":"Will Little Rock, AR face tornado risk on September 11?","group_item_title":"Little Rock, AR","description":"This market will resolve to \"Yes\" if Little Rock, AR falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 34.7465, -92.2896 for Little Rock, AR.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.016,0.984],"probability":0.016,"spread":0.008,"active":true,"closed":false,"start_date":"2026-09-11T12:13:19Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":20.0,"volume_24hr":20.0,"prob_24h_change":-0.009000000000000001,"volume_24h_change":20.0,"normalized_vol_24hr":3.7697110176086426,"normalized_volume":2.719484329223633,"liquidity":32.63538,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:21:22.750357Z","fetched_at":"2026-09-11T23:21:22.750357Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-little-rock-ar","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.025,0.0255,0.025,0.0245,0.0245,0.0245,0.025,0.0245,0.025,0.0245,0.0245,0.014,0.016,0.0135,0.016]},{"source":"polymarket","id":"4465948","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-louisville-ky","question":"Will Louisville, KY face tornado risk on September 11?","group_item_title":"Louisville, KY","description":"This market will resolve to \"Yes\" if Louisville, KY falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 38.2527, -85.7585 for Louisville, KY.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.0155,0.9845],"probability":0.0155,"spread":0.009,"active":true,"closed":false,"start_date":"2026-09-11T12:13:16Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":82.5,"volume_24hr":82.5,"prob_24h_change":-0.4795,"volume_24h_change":82.5,"normalized_vol_24hr":7.962806224822998,"normalized_volume":5.744399547576904,"liquidity":31.4162,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:21:22.750357Z","fetched_at":"2026-09-11T23:21:22.750357Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-louisville-ky","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.495,0.025,0.025,0.025,0.0255,0.025,0.0155,0.025,0.0155,0.0135,0.0155]},{"source":"polymarket","id":"4465957","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-birmingham-al","question":"Will Birmingham, AL face tornado risk on September 11?","group_item_title":"Birmingham, AL","description":"This market will resolve to \"Yes\" if Birmingham, AL falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 33.5186, -86.8104 for Birmingham, AL.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.0155,0.9845],"probability":0.0155,"spread":0.007,"active":true,"closed":false,"start_date":"2026-09-11T12:13:14Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":20.0,"volume_24hr":20.0,"prob_24h_change":-0.484,"volume_24h_change":20.0,"normalized_vol_24hr":3.7697110176086426,"normalized_volume":2.719484329223633,"liquidity":32.40528,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:21:22.750357Z","fetched_at":"2026-09-11T23:21:22.750357Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-birmingham-al","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.4995,0.5,0.4995,0.0255,0.025,0.016,0.025,0.0255,0.0135,0.0255,0.014,0.025,0.0255,0.016,0.0135,0.0155]},{"source":"polymarket","id":"4465958","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-des-moines-ia","question":"Will Des Moines, IA face tornado risk on September 11?","group_item_title":"Des Moines, IA","description":"This market will resolve to \"Yes\" if Des Moines, IA falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 41.5868, -93.625 for Des Moines, IA.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.015,0.985],"probability":0.015,"spread":0.01,"active":true,"closed":false,"start_date":"2026-09-11T12:13:15Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":60.0,"volume_24hr":60.0,"prob_24h_change":-0.4845,"volume_24h_change":60.0,"normalized_vol_24hr":6.872868061065674,"normalized_volume":4.958113670349121,"liquidity":40.84315,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:21:22.750357Z","fetched_at":"2026-09-11T23:21:22.750357Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-des-moines-ia","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.4995,0.5,0.4995,0.0255,0.0325,0.0335,0.0325,0.0325,0.033,0.035,0.0325,0.015,0.013,0.015]},{"source":"polymarket","id":"4465936","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-houston-tx","question":"Will Houston, TX face tornado risk on September 11?","group_item_title":"Houston, TX","description":"This market will resolve to \"Yes\" if Houston, TX falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 29.7604, -95.3698 for Houston, TX.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.0135,0.9865],"probability":0.0135,"spread":0.005,"active":true,"closed":false,"start_date":"2026-09-11T12:13:13Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":20.0,"volume_24hr":20.0,"prob_24h_change":-0.4815,"volume_24h_change":20.0,"normalized_vol_24hr":3.7697110176086426,"normalized_volume":2.719484329223633,"liquidity":75.72861,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:59:46.007709Z","fetched_at":"2026-09-11T23:59:46.007709Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-houston-tx","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.495,0.025,0.5,0.5,0.017,0.017,0.017,0.0215,0.0175,0.0175,0.0175,0.017,0.017,0.0175]},{"source":"polymarket","id":"4465945","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-nashville-tn","question":"Will Nashville, TN face tornado risk on September 11?","group_item_title":"Nashville, TN","description":"This market will resolve to \"Yes\" if Nashville, TN falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 36.1627, -86.7816 for Nashville, TN.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.4995,0.5005],"probability":0.4995,"spread":0.977,"active":true,"closed":false,"start_date":"2026-09-11T12:13:16Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":0.0,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":2.59509,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:40:35.868778Z","fetched_at":"2026-09-11T23:40:35.868778Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-nashville-tn","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.4995,0.025,0.025,0.5,0.016,0.015,0.0135,0.499,0.012,0.4995,0.4995,0.012,0.012,0.012,0.4995,0.4995,0.012,0.4995]},{"source":"polymarket","id":"4465950","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-kansas-city-mo","question":"Will Kansas City, MO face tornado risk on September 11?","group_item_title":"Kansas City, MO","description":"This market will resolve to \"Yes\" if Kansas City, MO falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 39.0997, -94.5786 for Kansas City, MO.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.4995,0.5005],"probability":0.4995,"spread":0.977,"active":true,"closed":false,"start_date":"2026-09-11T12:13:13Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":0.004500000000000004,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":2.61009,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:59:46.007709Z","fetched_at":"2026-09-11T23:59:46.007709Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-kansas-city-mo","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.495,0.025,0.4995,0.0255,0.0155,0.499,0.015,0.499,0.0115,0.4995,0.4995,0.024,0.499,0.4995,0.0205,0.4995,0.0115,0.012]},{"source":"polymarket","id":"4465938","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-dallas-tx","question":"Will Dallas, TX face tornado risk on September 11?","group_item_title":"Dallas, TX","description":"This market will resolve to \"Yes\" if Dallas, TX falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 32.7767, -96.797 for Dallas, TX.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.0205,0.9795],"probability":0.0205,"spread":0.019,"active":true,"closed":false,"start_date":"2026-09-11T12:13:23Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":-0.4745,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":68.41001,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T21:25:38.641638Z","fetched_at":"2026-09-11T21:25:38.641638Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-dallas-tx","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.495,0.025,0.025,0.02,0.0205,0.02,0.015,0.02,0.0205,0.02,0.0205,0.02,0.02,0.0205]},{"source":"polymarket","id":"4465947","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-memphis-tn","question":"Will Memphis, TN face tornado risk on September 11?","group_item_title":"Memphis, TN","description":"This market will resolve to \"Yes\" if Memphis, TN falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 35.1495, -90.049 for Memphis, TN.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.0205,0.9795],"probability":0.0205,"spread":0.019,"active":true,"closed":false,"start_date":"2026-09-11T12:13:21Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":-0.479,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":98.65501,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:21:22.750357Z","fetched_at":"2026-09-11T23:21:22.750357Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-memphis-tn","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.4995,0.025,0.025,0.02,0.0205,0.02,0.02,0.0205,0.0205,0.0205,0.02,0.0205,0.0135,0.0205]},{"source":"polymarket","id":"4465953","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-wichita-ks","question":"Will Wichita, KS face tornado risk on September 11?","group_item_title":"Wichita, KS","description":"This market will resolve to \"Yes\" if Wichita, KS falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 37.6872, -97.3301 for Wichita, KS.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.011,0.989],"probability":0.011,"spread":0.002,"active":true,"closed":false,"start_date":"2026-09-11T12:13:14Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":-0.014000000000000002,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":143.12561,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:59:46.007709Z","fetched_at":"2026-09-11T23:59:46.007709Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-wichita-ks","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.025,0.5,0.4995,0.0255,0.0155,0.499,0.014,0.499,0.012,0.012,0.4995,0.024,0.012,0.4995,0.012,0.012,0.5015,0.4995]},{"source":"polymarket","id":"4465954","event_id":"1004187","slug":"which-cities-face-tornado-risk-on-september-11-2026-new-orleans-la","question":"Will New Orleans, LA face tornado risk on September 11?","group_item_title":"New Orleans, LA","description":"This market will resolve to \"Yes\" if New Orleans, LA falls within a tornado probability area rated ≥2% in the NOAA Storm Prediction Center Day 1 Convective Outlook on September 11, 2026. Otherwise, this market will resolve to \"No\".\n\nThe SPC Day 1 Convective Outlook assigns tornado probability percentages (2%, 5%, 10%, etc.) to geographic areas across the US. If the city's coordinates fall inside any area rated 2% or higher, that city resolves \"Yes\". If a city is outside all tornado probability areas, or only within areas rated below 2%, that city resolves \"No\".\n\nThe SPC outlook is published as machine-readable geographic data (GeoJSON) at spc.noaa.gov. Each city's coordinates and the polygon boundaries are publicly verifiable. Borderline cases can be independently confirmed using the polygon data (excluding the hatched SIGN overlay, which is not a probability rating) and the city's listed coordinates. The point-in-polygon test is performed on unprojected WGS84 (EPSG:4326) coordinates, which is the native coordinate system of the SPC GeoJSON data.\n\nResolution is based on the scheduled 01:00 UTC Day 1 Convective Outlook update issued on the following UTC calendar day. The SPC Day 1 outlook covers a 24-hour period from 12:00 UTC to 12:00 UTC the following day. Subsequent revisions published after that scheduled update will not be considered. If the SPC Day 1 Convective Outlook has not been published by the time the market closes, this market will resolve to \"No\".\n\nThe resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.\n\nThis market uses coordinates 29.9511, -90.0715 for New Orleans, LA.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/how-many-tornadoes-in-the-us-in-november-W7XLO0OomR-x.png","outcomes":["Yes","No"],"outcome_prices":[0.011,0.989],"probability":0.011,"spread":0.002,"active":true,"closed":false,"start_date":"2026-09-11T12:13:14Z","end_date":"2026-09-12T12:00:00Z","closed_time":null,"volume":0.0,"volume_24hr":0.0,"prob_24h_change":-0.4885,"volume_24h_change":0.0,"normalized_vol_24hr":null,"normalized_volume":null,"liquidity":143.14561,"categories":["Climate and Weather"],"countries":[],"updated_at":"2026-09-11T23:59:46.007709Z","fetched_at":"2026-09-11T23:59:46.007709Z","added_at":"2026-09-11T12:22:45.680983Z","url":"https://polymarket.com/event/which-cities-face-tornado-risk-on-september-11-2026/which-cities-face-tornado-risk-on-september-11-2026-new-orleans-la","event_title":"Which cities face tornado risk on September 11?","chart_24h":[0.4995,0.025,0.4995,0.0255,0.0155,0.499,0.015,0.499,0.012,0.0125,0.4995,0.499,0.0115,0.0115,0.0125,0.499,0.499,0.499]}],"_meta":{"attribution":"pdata.world — aggregated prediction-market data across 8 platforms","canonical_url":"https://pdata.world/events/polymarket/1004187","as_of":"2026-09-12T00:10:08.123887Z","docs":"https://api.pdata.world/docs","cite_as":"According to pdata.world (tracking Polymarket): \"Which cities face tornado risk on September 11?\" — top market at 2% probability across 25 outcomes","source_url":null}}