This alert expired on 11 August 2026 at 19:30 UTC. It is kept here as a record.
It is the 4th strongest of the 106 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 27 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued August 11 at 8:59AM EDT until August 11 at 3:30PM EDT by NWS Charleston WV
An estimated 138,294 people live within 50 km of this point.
Nearby, since 12 March 2026
- May 20, 2026 · score 43 · 4.3 km
- May 24, 2026 · score 43 · 8.3 km
- May 27, 2026 · score 43 · 8.9 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 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) | 43 / 100 |
| Our confidence | 81% |
| Coordinates | 39.6906, -82.1364 |
| Nearest City | Zanesville (30 km) |
| Population Exposed | 138.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T12:59:00.000Z |
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Perry, OH; Morgan, OH; Perry, OH; Athens, OH; Morgan, OH; Washington, OH and 1 more areas |
| Headline | Flood Warning issued August 11 at 8:59AM EDT until August 11 at 3:30PM EDT by NWS Charleston WV |
| Expires | 2026-08-11T15:30:00-04:00 |
| SenderName | NWS Charleston WV |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a62f27bd9b09ed109f459a77e0180075837f12b6.001.1","noaa_urn:oid:2.49.0.1.840.0.aee5e55278e894c0a59ad3934fd21d50c3f14fd5.001.1","noaa_urn:oid:2.49.0.1.840.0.34ecdbb8a4778f71ac9d99c0a99919752a8eb6e7.001.1","noaa_urn:oid:2.49.0.1.840.0.3c7a43aed288a5d6cb4b9d056a42715ad6a40a8f.001.1"] |
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 43/100, near Zanesville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 194 scientific monitoring sources.