This alert expired on 21 May 2026 at 01:00 UTC. It is kept here as a record.
It is the 21st strongest of the 125 detections recorded within 20 km of this point since 16 March 2026. 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: Severe Thunderstorm Watch issued May 20 at 3:50PM EDT until May 20 at 9:00PM EDT by NWS Charleston WV
An estimated 733,258 people live within 50 km of this point.
Nearby, since 16 March 2026
- August 12, 2026 · score 48 · 0.0 km
- August 11, 2026 · score 48 · 0.0 km
- July 28, 2026 · score 48 · 0.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 out of 100, at 79 % 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) | 48 / 100 |
| Our confidence | 79% |
| Coordinates | 37.8000, -84.3000 |
| Nearest City | Richmond (6 km) |
| Population Exposed | 733.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-20T19:50:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Watch_noaa_urn:oid:2.49.0.1.840.0.430065d19666ac629eca60772a8f3cc0 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Lawrence, KY; Gallia, OH; Lawrence, OH; Buchanan, VA; Dickenson, VA; Boone, WV; Braxton, WV; Cabell, WV; Calhoun, WV; Clay, WV; Fayette, WV; Gilmer, WV; Jackson, WV; Kanawha, WV; Lewis, WV; Lincoln, WV; Logan, WV; McDowell, WV; Mason, WV; Mingo, WV; Nicholas, WV; Pocahontas, WV; Putnam, WV; Raleigh, WV; Randolph, WV; Roane, WV; Upshur, WV; Wayne, WV; Webster, WV; Wirt, WV; Wyoming, WV; Bell, KY; Breathitt, KY; Clay, KY; Floyd, KY; Harlan, KY; Johnson, KY; Knott, KY; Knox, KY; Leslie, KY; Letcher, KY; Magoffin, KY; Martin, KY; Perry, KY; Pike, KY |
| Headline | Severe Thunderstorm Watch issued May 20 at 3:50PM EDT until May 20 at 9:00PM EDT by NWS Charleston WV |
| Expires | 2026-05-20T21:00:00-04:00 |
| SenderName | NWS Charleston WV |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.430065d19666ac629eca60772a8f3cc01e6041c4.001.1","noaa_urn:oid:2.49.0.1.840.0.9c1c97123dda6d37ddca0aaf5de3a3d82ae67c91.001.1"] |
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 near Richmond?
Calamity.live data shows a weather event with CalamityScore 48/100, near Richmond (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.