---
title: "Which cities face tornado risk on August 20?"
canonical_url: https://betcrypto.now/events/which-cities-face-tornado-risk-on-august-20
status: ended
trading_closes_at: 2026-08-21T12:00:00+00:00
total_volume_usd: 5427.76
venues: ["Polymarket"]
categories: ["Tech & Science"]
prices_as_of: 2026-10-10T19:14:06+00:00
publisher: BetCrypto
data_api: https://betcrypto.now/api/v1/events/which-cities-face-tornado-risk-on-august-20
---

# Which cities face tornado risk on August 20?

Ended · $5,428 traded · listed on Polymarket

## Result

Delisted by every venue without a result — this event will not resolve.

## About

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 August 20, 2026. Otherwise, this market will resolve to "No".

The 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".

The 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.

Resolution 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 outlook is not published or is unavailable, the market remains open until data is available.

The resolution source for this market is the NOAA Storm Prediction Center at spc.noaa.gov.

_From Polymarket's listing._

## Chicago, IL

| Outcome | Probability | Cheapest | Polymarket |
|---|---|---|---|
| Yes | — | — | 88¢ |
| No | — | — | 56¢ |

## Other markets

- Houston, TX — 2 outcomes
- San Antonio, TX — 2 outcomes
- Dallas, TX — 2 outcomes
- Austin, TX — 2 outcomes
- Fort Worth, TX — 2 outcomes
- Columbus, OH — 2 outcomes
- Charlotte, NC — 2 outcomes
- Indianapolis, IN — 2 outcomes
- Denver, CO — 2 outcomes
- Nashville, TN — 2 outcomes
- Oklahoma City, OK — 2 outcomes
- Memphis, TN — 2 outcomes
- Louisville, KY — 2 outcomes
- Atlanta, GA — 2 outcomes
- Kansas City, MO — 2 outcomes
- Omaha, NE — 2 outcomes
- Minneapolis, MN — 2 outcomes
- Wichita, KS — 2 outcomes
- New Orleans, LA — 2 outcomes
- Tampa, FL — 2 outcomes
- St. Louis, MO — 2 outcomes
- Birmingham, AL — 2 outcomes
- Des Moines, IA — 2 outcomes
- Little Rock, AR — 2 outcomes

_Every market's prices are on the event page._

## Open on a venue

- [Polymarket](https://betcrypto.now/go/e/296831?via=md)

---

Probability is the cross-venue consensus (book midpoints, 0–100%). Venue columns are what buying costs there (the ask). Prices move constantly; re-check at the canonical URL or https://betcrypto.now/api/v1/events/which-cities-face-tornado-risk-on-august-20.

BetCrypto is an odds-comparison and information service. It accepts no wagers and gives no betting or financial advice; prediction-market availability depends on where you live.