This alert expired on 16 May 2026 at 09:00 UTC. It is kept here as a record.
It is the strongest of the 74 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 13 May 2026. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 16 at 4:24AM EDT until May 16 at 5:00AM EDT by NWS Grand Rapids MI
An estimated 518,664 people live within 50 km of this point.
Nearby, since 11 March 2026
- June 12, 2026 · score 41 · 4.2 km
- March 11, 2026 · score 41 · 15.0 km
- June 10, 2026 · score 37 · 19.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 out of 100, at 81 % 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) | 48 / 100 |
| Our confidence | 81% |
| Coordinates | 43.0417, -86.0067 |
| Nearest City | Allendale (9 km) |
| Population Exposed | 518.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-16T08:24:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Muskegon, MI; Ottawa, MI |
| Headline | Severe Thunderstorm Warning issued May 16 at 4:24AM EDT until May 16 at 5:00AM EDT by NWS Grand Rapids MI |
| Expires | 2026-05-16T05:00:00-04:00 |
| 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 48/100, near Allendale (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.