This alert expired on 10 August 2026 at 02:30 UTC. It is kept here as a record.
No stronger detection stands among the 31 recorded within 20 km of this point since 12 March 2026 — 9 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 9 at 9:50PM EDT until August 9 at 10:30PM EDT by NWS Wilmington OH
An estimated 137,930 people live within 50 km of this point.
Nearby, since 12 March 2026
- July 4, 2026 · score 43 · 10.7 km
- March 12, 2026 · score 39 · 13.0 km
- August 10, 2026 · score 43 · 19.8 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 84 % 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 | 84% |
| Coordinates | 40.5954, -82.9479 |
| Nearest City | Marion (15 km) |
| Population Exposed | 137.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-10T01:50:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.3fe6d4393614075025fc7c6f20654e0b |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Delaware, OH; Franklin, OH; Madison, OH; Union, OH; Erie, OH; Huron, OH; Franklin, OH; Madison, OH; Union, OH |
| Headline | Severe Thunderstorm Warning issued August 9 at 9:50PM EDT until August 9 at 10:30PM EDT by NWS Wilmington OH |
| Expires | 2026-08-09T22:30:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3fe6d4393614075025fc7c6f20654e0b9cd032c8.001.1","noaa_urn:oid:2.49.0.1.840.0.a6973b9543c5bddaec519f1364b423573b66d314.001.1","noaa_urn:oid:2.49.0.1.840.0.2ce6b38d818957a553ece2b7dd79316e2fa8e119.002.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 47 |
| Iem Unit | MPH |
| Iem City | 3 SW Kenton |
| Iem County | Hardin |
| Iem State | OH |
| Iem Wfo | ILN |
| MergedSources | [{"id":"iem_G_40.610_-83.640_1786323420000","source":"iem","severity":"low","severityValue":25,"timestamp":1786323420000,"latitude":40.61,"longitude":-83.64}] |
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 43/100, near Marion (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.