This alert expired on 9 August 2026 at 01:15 UTC. It is kept here as a record.
It is the 7th strongest of the 24 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 8 at 9:05PM EDT until August 8 at 9:15PM EDT by NWS Wilmington OH
An estimated 1,151,873 people live within 50 km of this point.
Nearby, since 15 March 2026
- August 9, 2026 · score 52 · 4.6 km
- August 8, 2026 · score 52 · 11.9 km
- August 11, 2026 · score 67 · 14.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 81 % 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 | 81% |
| Coordinates | 39.7546, -83.4407 |
| Nearest City | Grove City (33 km) |
| Population Exposed | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-09T01:05:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Butler, OH; Warren, OH; Fairfield, OH; Licking, OH |
| Headline | Severe Thunderstorm Warning issued August 8 at 9:05PM EDT until August 8 at 9:15PM EDT by NWS Wilmington OH |
| Expires | 2026-08-08T21:15:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5aa18499597b3ae8e393c2a6b34c3d7175713277.001.1","noaa_urn:oid:2.49.0.1.840.0.bc64866d9a2bfd39d5ce63e6ae9c7aba8ac421be.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 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 Grove City (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 194 scientific monitoring sources.