This alert expired on 11 August 2026 at 14:22 UTC. It is kept here as a record.
No stronger detection stands among the 86 recorded within 20 km of this point since 13 March 2026 — 22 others scored the same. Another comparable one was recorded here earlier the same day. 15 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 11 at 10:12AM EDT until August 11 at 10:15AM EDT by NWS Wilmington OH
An estimated 1,355,780 people live within 50 km of this point.
Nearby, since 13 March 2026
- April 19, 2026 · score 52 · 7.1 km
- April 4, 2026 · score 52 · 7.1 km
- March 23, 2026 · score 52 · 7.1 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 86 % 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 | 86% |
| Coordinates | 39.9265, -82.8856 |
| Nearest City | Whitehall (5 km) |
| Population Exposed | 1.4M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T14:12:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Madison, OH; Union, OH; Fairfield, OH; Hocking, OH; Licking, OH; Delaware, OH; Franklin, OH; Pickaway, OH |
| Headline | Severe Thunderstorm Warning issued August 11 at 10:12AM EDT until August 11 at 10:15AM EDT by NWS Wilmington OH |
| Expires | 2026-08-11T10:22:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5ebc3502988a0333bbfd7d14f103ed304613a3f9.001.1","noaa_urn:oid:2.49.0.1.840.0.0d908e5a30454cdfacee815eb53efd5daec8b862.001.1","noaa_urn:oid:2.49.0.1.840.0.9c7a0c9a81906a68168b46f876a0c79b18fae28b.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
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 Whitehall (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.