This alert expired on 15 March 2026 at 22:45 UTC. It is kept here as a record.
No stronger detection stands among the 205 recorded within 20 km of this point since 15 March 2026 — one other scored the same. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued March 15 at 5:05PM CDT until March 15 at 5:45PM CDT by NWS St Louis MO
An estimated 1,102,545 people live within 50 km of this point.
Nearby, since 15 March 2026
- March 16, 2026 · score 52 · 3.0 km
- March 15, 2026 · score 76 · 10.9 km
- July 11, 2026 · score 48 · 12.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 76 out of 100, at 75 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | critical |
| Calamity Score (ours) | 76 / 100 |
| Our confidence | 75% |
| Coordinates | 38.6875, -89.9956 |
| Nearest City | Collinsville (2 km) |
| Population Exposed | 1.1M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-03-15T22:05:00.000Z |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Madison, IL; St. Clair, IL |
| Headline | Tornado Warning issued March 15 at 5:05PM CDT until March 15 at 5:45PM CDT by NWS St Louis MO |
| Expires | 2026-03-15T17:45:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
Series begins 10 February 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Calamity.live data shows a weather event with CalamityScore 76/100, near Collinsville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.