This alert expired on 12 March 2026 at 00:15 UTC. It is kept here as a record.
It is the 5th strongest of the 17 detections recorded within 20 km of this point since 11 March 2026.
What the source measured
NOAA reported: Flash Flood Warning issued March 11 at 5:16PM EDT until March 11 at 8:15PM EDT by NWS Wilmington OH
An estimated 21,727 people live within 50 km of this point.
Nearby, since 11 March 2026
- March 16, 2026 · score 34 · 5.1 km
- May 28, 2026 · score 34 · 22.0 km
- July 11, 2026 · score 43 · 23.0 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 77 % 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) | 34 / 100 |
| Our confidence | 77% |
| Coordinates | 39.4279, -83.3893 |
| Nearest City | Chillicothe (37 km) |
| Population Exposed | 21.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-11T21:16:00.000Z |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Clinton, OH; Fayette, OH; Highland, OH; Pickaway, OH; Ross, OH |
| Headline | Flash Flood Warning issued March 11 at 5:16PM EDT until March 11 at 8:15PM EDT by NWS Wilmington OH |
| Expires | 2026-03-11T20:15:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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 34/100, near Chillicothe (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 194 scientific monitoring sources.