This alert expired on 11 August 2026 at 15:15 UTC. It is kept here as a record.
It is the 3rd strongest of the 28 detections recorded within 20 km of this point since 23 March 2026. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 11 at 7:18AM EDT until August 11 at 11:15AM EDT by NWS Pittsburgh PA
An estimated 126,803 people live within 50 km of this point.
Nearby, since 23 March 2026
- July 21, 2026 · score 43 · 17.7 km
- June 7, 2026 · score 43 · 18.8 km
- May 26, 2026 · score 43 · 19.6 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 87 % 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 | 87% |
| Coordinates | 40.3716, -82.3876 |
| Nearest City | Mount Vernon (9 km) |
| Population Exposed | 126.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T11:18:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.faa7b823d35de215079abc0d3af92e23 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Coshocton, OH; Guernsey, OH; Muskingum, OH; Noble, OH; Tuscarawas, OH; Fairfield, OH; Hocking, OH; Erie, OH |
| Headline | Flash Flood Warning issued August 11 at 7:18AM EDT until August 11 at 11:15AM EDT by NWS Pittsburgh PA |
| Expires | 2026-08-11T11:15:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.faa7b823d35de215079abc0d3af92e2356eabad8.001.1","noaa_urn:oid:2.49.0.1.840.0.e9b962fe6a7b7853bd0a8e87164d4bdd69e17636.002.1","noaa_urn:oid:2.49.0.1.840.0.abeaaf0dab094c63efb30d5c63c779e01be654a6.001.1"] |
| Iem TypeSummary | F |
| Iem City | 2 SSE Downtown Columbus |
| Iem County | Franklin |
| Iem State | OH |
| Iem Wfo | ILN |
| Iem Remark | Multiple vehicles stranded in one to two feet of water on Parsons Avenue south of Stewart Avenue. |
| MergedSources | [{"id":"iem_F_39.930_-82.980_1786440000000","source":"iem","severity":"low","severityValue":25,"timestamp":1786440000000,"latitude":39.93,"longitude":-82.98}] |
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 Mount Vernon (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.