This alert expired on 11 August 2026 at 05:30 UTC. It is kept here as a record.
It is the 2nd strongest of the 43 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 10 August 2026. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 11 at 12:49AM EDT until August 11 at 1:30AM EDT by NWS Wilmington OH
An estimated 61,493 people live within 50 km of this point.
Nearby, since 12 March 2026
- July 11, 2026 · score 39 · 8.5 km
- July 21, 2026 · score 63 · 14.1 km
- June 18, 2026 · score 39 · 16.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 39 out of 100, at 80 % 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) | 39 / 100 |
| Our confidence | 80% |
| Coordinates | 39.3066, -82.7329 |
| Nearest City | Chillicothe (21 km) |
| Population Exposed | 61.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T04:49:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.912d2a630c39a6fb24211a13d0c21aad |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Clinton, OH; Fayette, OH; Highland, OH; Ross, OH; Athens, OH; Meigs, OH |
| Headline | Severe Thunderstorm Warning issued August 11 at 12:49AM EDT until August 11 at 1:30AM EDT by NWS Wilmington OH |
| Expires | 2026-08-11T01:30:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.912d2a630c39a6fb24211a13d0c21aadc3927b57.001.1","noaa_urn:oid:2.49.0.1.840.0.bce429846dfd6e8b5cc9d13570542d6526ceed30.001.1"] |
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 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 39/100, near Chillicothe (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.