This alert expired on 12 August 2026 at 13:00 UTC. It is kept here as a record.
It is the 4th strongest of the 29 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 12 at 8:19AM EDT until August 12 at 9:00AM EDT by NWS Wilmington OH
An estimated 79,521 people live within 50 km of this point.
Nearby, since 12 March 2026
- March 12, 2026 · score 43 · 17.5 km
- June 17, 2026 · score 63 · 23.7 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 39 out of 100, at 91 % 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) | 39 / 100 |
| Our confidence | 91% |
| Coordinates | 40.4860, -84.4080 |
| Nearest City | Sidney (31 km) |
| Population Exposed | 79.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-12T12:19:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.76388ab269d7b6653b2a0ed3a167f87842e08c98.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Auglaize, OH; Mercer, OH; Shelby, OH |
| Headline | Severe Thunderstorm Warning issued August 12 at 8:19AM EDT until August 12 at 9:00AM EDT by NWS Wilmington OH |
| Expires | 2026-08-12T09:00:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | Celina |
| Iem County | Mercer |
| Iem State | OH |
| Iem Wfo | ILN |
| MergedSources | [{"id":"iem_F_40.120_-85.090_1786529700000","source":"iem","severity":"low","severityValue":25,"timestamp":1786529700000,"latitude":40.12,"longitude":-85.09},{"id":"iem_H_40.550_-84.570_1786536480000","source":"iem","severity":"low","severityValue":25,"timestamp":1786536480000,"latitude":40.55,"longitude":-84.57},{"id":"iem_H_40.550_-84.570_1786536540000","source":"iem","severity":"low","severityValue":25,"timestamp":1786536540000,"latitude":40.55,"longitude":-84.57}] |
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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 39/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.