This alert expired on 15 March 2026 at 22:45 UTC. It is kept here as a record.
No stronger detection stands among the 83 recorded within 20 km of this point since 15 March 2026 — 2 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were 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 1,238,883 people live within 50 km of this point.
Nearby, since 15 March 2026
- March 16, 2026 · score 52 · 8.1 km
- May 19, 2026 · score 52 · 10.6 km
- May 18, 2026 · score 52 · 10.6 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 79 % 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 | 79% |
| Coordinates | 38.6727, -90.1203 |
| Nearest City | Granite City (4 km) |
| Population Exposed | 1.2M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-03-15T22:05:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.600db35b8aad8aa240dcc453a6601400 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Madison, IL; St. Clair, IL; St. Louis, MO; St. Louis City, MO |
| 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 |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.600db35b8aad8aa240dcc453a6601400395e85a9.001.1","noaa_urn:oid:2.49.0.1.840.0.b4a7e54855952f573a61aa767f53faaee574347c.001.1"] |
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 Granite City (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.