This alert expired on 28 May 2026 at 01:15 UTC. It is kept here as a record.
It is the 2nd strongest of the 103 detections recorded within 20 km of this point since 27 March 2026. The last comparable one was on 27 May 2026. 13 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued May 27 at 8:13PM EDT until May 27 at 9:00PM EDT by NWS Charleston WV
An estimated 1,247,659 people live within 50 km of this point.
Nearby, since 27 March 2026
- August 11, 2026 · score 52 · 0.0 km
- August 10, 2026 · score 52 · 0.0 km
- August 9, 2026 · score 52 · 0.0 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 90 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 90% |
| Coordinates | 40.4000, -82.9000 |
| Nearest City | Delaware (18 km) |
| Population Exposed | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-28T00:13:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.b166a76ef8e7c9f2f95f403165eca4aa118117a8.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Lawrence, OH; Boone, WV; Cabell, WV; Clay, WV; Fayette, WV; Kanawha, WV; Lincoln, WV; Logan, WV; McDowell, WV; Mingo, WV; Nicholas, WV; Pocahontas, WV; Putnam, WV; Raleigh, WV; Wayne, WV; Webster, WV; Wyoming, WV |
| Headline | Severe Thunderstorm Watch issued May 27 at 8:13PM EDT until May 27 at 9:00PM EDT by NWS Charleston WV |
| Expires | 2026-05-27T21:15:00-04:00 |
| SenderName | NWS Charleston WV |
| HasExactCoords | false |
| Iem TypeSummary | E |
| Iem City | 3 ENE London |
| Iem County | Madison |
| Iem State | OH |
| Iem Wfo | ILN |
| Iem Remark | Spring Valley closed between 42 and 142. |
| MergedSources | [{"id":"iem_E_39.950_-83.490_1779905580000","source":"iem","severity":"low","severityValue":25,"timestamp":1779905580000,"latitude":39.95,"longitude":-83.49},{"id":"iem_E_39.910_-83.400_1779905700000","source":"iem","severity":"low","severityValue":25,"timestamp":1779905700000,"latitude":39.91,"longitude":-83.4}] |
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 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 52/100, near Delaware (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.