This alert expired on 31 May 2026 at 19:00 UTC. It is kept here as a record.
No stronger detection stands among the 20 recorded within 20 km of this point since 15 March 2026 — 8 others scored the same. The last comparable one was on 27 April 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 31 at 1:08PM CDT until May 31 at 2:00PM CDT by NWS St Louis MO
An estimated 20,019 people live within 50 km of this point.
Nearby, since 15 March 2026
- August 1, 2026 · score 28 · 4.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 out of 100, at 81 % 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 | Medium |
| Calamity Score (ours) | 34 / 100 |
| Our confidence | 81% |
| Coordinates | 37.9614, -91.3729 |
| Nearest City | Rolla (35 km) |
| Population Exposed | 20.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-31T18:08:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.56fc2785aac9e588df3689116ec02030 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Washington, MO; Phelps, MO |
| Headline | Severe Thunderstorm Warning issued May 31 at 1:08PM CDT until May 31 at 2:00PM CDT by NWS St Louis MO |
| Expires | 2026-05-31T14:00:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.56fc2785aac9e588df3689116ec02030fd8d14e0.001.1","noaa_urn:oid:2.49.0.1.840.0.861dd1a3e1468d9a92896d31d0b0782e86b0777a.002.1"] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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 in this area?
Calamity.live data shows a weather event with CalamityScore 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.