This alert expired on 12 June 2026 at 01:45 UTC. It is kept here as a record.
It is the 2nd strongest of the 79 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 10 June 2026. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 11 at 8:11PM EDT until June 11 at 9:45PM EDT by NWS Grand Rapids MI
An estimated 518,664 people live within 50 km of this point.
Nearby, since 11 March 2026
- May 16, 2026 · score 48 · 4.2 km
- March 11, 2026 · score 41 · 11.6 km
- June 10, 2026 · score 37 · 17.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 41 out of 100, at 79 % 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) | 41 / 100 |
| Our confidence | 79% |
| Coordinates | 43.0045, -85.9945 |
| Nearest City | Allendale (5 km) |
| Population Exposed | 518.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-12T00:11:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Allegan, MI; Muskegon, MI; Ottawa, MI |
| Headline | Severe Thunderstorm Warning issued June 11 at 8:11PM EDT until June 11 at 9:45PM EDT by NWS Grand Rapids MI |
| Expires | 2026-06-11T21:45:00-04:00 |
| 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 41/100, near Allendale (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.