This alert expired on 11 August 2026 at 03:04 UTC. It is kept here as a record.
It is the 4th strongest of the 28 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 10 at 10:54PM EDT until August 10 at 11:00PM EDT by NWS Wilmington OH
An estimated 214,306 people live within 50 km of this point.
Nearby, since 12 March 2026
- July 10, 2026 · score 52 · 14.5 km
- March 12, 2026 · score 52 · 16.3 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 80 % 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 | 80% |
| Coordinates | 40.3723, -83.3943 |
| Nearest City | Marysville (15 km) |
| Population Exposed | 214.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T02:54:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.b4ca969b18c0931ac072417a3fcfd1a4 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Auglaize, OH; Mercer, OH; Knox, OH; Morrow, OH; Marion, OH and 2 more areas |
| Headline | Severe Thunderstorm Warning issued August 10 at 10:54PM EDT until August 10 at 11:00PM EDT by NWS Wilmington OH |
| Expires | 2026-08-10T23:04:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b4ca969b18c0931ac072417a3fcfd1a4ea6912e7.001.1","noaa_urn:oid:2.49.0.1.840.0.47cf5572285df607e6bbc994bf09fef34298a849.002.1","noaa_urn:oid:2.49.0.1.840.0.990ec3978f91b346962ee63b0b49629b03752e9f.001.1","noaa_urn:oid:2.49.0.1.840.0.ac2badefa44fa937cbbebc5a7a35e6f6ad332a0b.001.1","noaa_urn:oid:2.49.0.1.840.0.5913983a9452ebcd8571bb08f34e21cbadde3129.001.1"] |
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 Marysville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.