This alert expired on 15 March 2026 at 22:15 UTC. It is kept here as a record.
No stronger detection stands among the 107 recorded within 20 km of this point since 15 March 2026 — one other 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 4:47PM CDT until March 15 at 5:15PM CDT by NWS St Louis MO
An estimated 1,323,923 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 13, 2026 · score 52 · 9.5 km
- March 15, 2026 · score 76 · 11.0 km
- March 16, 2026 · score 52 · 14.0 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 76 out of 100, at 88 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Critical |
| Calamity Score (ours) | 76 / 100 |
| Our confidence | 88% |
| Coordinates | 38.6579, -90.2450 |
| Nearest City | St. Louis (5 km) |
| Population Exposed | 1.3M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-03-15T21:47:00.000Z |
| Source | https://api.weather.gov/alerts/urn-oid-2_49_0_1_840_0_b4a7e54855952f573a61aa767f53faaee574347c_001_1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | St. Louis, MO; St. Louis City, MO |
| Headline | Tornado Warning issued March 15 at 4:47PM CDT until March 15 at 5:15PM CDT by NWS St Louis MO |
| Expires | 2026-03-15T17:15:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | Washington |
| Iem County | Franklin |
| Iem State | MO |
| Iem Wfo | LSX |
| Iem Remark | Tree down in Washington. |
| MergedSources | [{"id":"iem_C_38.970_-90.490_1773609240000","source":"iem","severity":"low","severityValue":25,"timestamp":1773609240000,"latitude":38.97,"longitude":-90.49},{"id":"iem_D_38.980_-90.980_1773607140000","source":"iem","severity":"low","severityValue":25,"timestamp":1773607140000,"latitude":38.98,"longitude":-90.98},{"id":"iem_D_38.440_-91.020_1773608700000","source":"iem","severity":"low","severityValue":25,"timestamp":1773608700000,"latitude":38.44,"longitude":-91.02},{"id":"iem_D_38.550_-91.020_1773608700000","source":"iem","severity":"low","severityValue":25,"timestamp":1773608700000,"latitude":38.55,"longitude":-91.02}] |
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 8 March 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.
Want to know when something happens near St. Louis?
Calamity.live data shows a weather event with CalamityScore 76/100, near St. Louis (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.