This alert expired on 16 March 2026 at 06:30 UTC. It is kept here as a record.
It is the 5th strongest of the 41 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 15 March 2026. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued March 16 at 1:48AM EDT until March 16 at 2:30AM EDT by NWS Wilmington OH
An estimated 1,220,161 people live within 50 km of this point.
Nearby, since 12 March 2026
- June 6, 2026 · score 52 · 9.4 km
- May 20, 2026 · score 52 · 14.0 km
- August 12, 2026 · score 43 · 17.1 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 88 % 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 | 88% |
| Coordinates | 40.0760, -83.5520 |
| Nearest City | Marysville (24 km) |
| Population Exposed | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-16T05:48:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7f2a122ff45ff063e3e1063dd3efb8680ac6c1ab.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Champaign, OH; Clark, OH; Greene, OH; Logan, OH; Madison, OH; Union, OH |
| Headline | Severe Thunderstorm Warning issued March 16 at 1:48AM EDT until March 16 at 2:30AM EDT by NWS Wilmington OH |
| Expires | 2026-03-16T02:30:00-04:00 |
| SenderName | NWS Wilmington OH |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | 59 |
| Spc Location | 2 NW Vandalia |
| Spc County | Montgomery |
| Spc State | OH |
| Spc Comments | (ILN) |
| Iem TypeSummary | N |
| Iem Magnitude | 46 |
| Iem Unit | MPH |
| Iem City | 2 NW Vandalia |
| Iem County | Montgomery |
| Iem State | OH |
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 Marysville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.