● Round 2026-11-13: Opens in Nov 13 00:00Z · 00:00Z (6:00 PM CST) · 0 forecasts so far
Tornado Forecast Challenge
Each day, forecast whether a tornado will occur in the continental United States, where, and when. Every forecast is checked automatically against the Storm Prediction Center's preliminary tornado reports, so you can see how your forecasting compares and how it improves over a season.
How it works
Forecast
Before 16Z, call YES or NO. For YES, place your target on the map and give your timing: a one-hour window for Spotters, a 15-minute window for Chasers, or the exact time of the day's first tornado for Forecasters.
Verify
From 1630Z to 12Z the next morning, tornado reports are matched to your target and window. A correct NO counts too.
Compare
Daily, season and all-time standings, in three divisions so players compete with others at their level.
Divisions
Spotter for players new to forecasting, Chaser for chasers, spotters and severe weather followers, Forecaster for meteorologists and meteorology students. You choose at sign-up, and promotion is automatic as your skill rating grows.
Follow it on radar
Your private My Forecast GeoFile puts your own target on RAVIN radar as soon as entries close at 16Z, so you can watch the day's storms against your call. Everyone else's targets stay private until verification ends at 12Z the next morning; then every player's target is published with the tornado reports and results. Add a link once in RAVIN (Layers → GeoFiles → Add GeoFile → From URL) and it moves to each new round by itself. Your private My Forecast link is on your profile.
https://stormchase.com/challenge/geofile/all.phphttps://stormchase.com/challenge/geofile/all.php?division=spotterhttps://stormchase.com/challenge/geofile/all.php?division=chaserhttps://stormchase.com/challenge/geofile/all.php?division=forecaster