This alert expired on 11 March 2026 at 00:45 UTC. It is kept here as a record.
It is the 2nd strongest of the 120 detections recorded within 20 km of this point since 11 March 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued March 10 at 8:02PM EDT until March 10 at 8:45PM EDT by NWS Grand Rapids MI
An estimated 456,055 people live within 50 km of this point.
Nearby, since 11 March 2026
- June 10, 2026 · score 37 · 10.1 km
- March 11, 2026 · score 41 · 17.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 37 out of 100, at 77 % 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) | 37 / 100 |
| Our confidence | 77% |
| Coordinates | 42.9880, -85.6740 |
| Nearest City | Grand Rapids (3 km) |
| Population Exposed | 456.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-11T00:02:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Kent, MI; Ottawa, MI |
| Headline | Severe Thunderstorm Warning issued March 10 at 8:02PM EDT until March 10 at 8:45PM EDT by NWS Grand Rapids MI |
| Expires | 2026-03-10T20:45:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
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 37/100, near Grand Rapids (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.