This alert expired on 11 March 2026 at 01:15 UTC. It is kept here as a record.
It is the 3rd strongest of the 7 detections recorded within 20 km of this point since 10 March 2026. The last comparable one was on 10 March 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued March 10 at 8:12PM EDT until March 10 at 9:15PM EDT by NWS Grand Rapids MI
An estimated 113,930 people live within 50 km of this point.
Nearby, since 10 March 2026
- March 10, 2026 · score 37 · 5.6 km
- June 6, 2026 · score 39 · 16.8 km
- June 16, 2026 · score 43 · 17.0 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 78 % 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 | 78% |
| Coordinates | 42.8350, -86.5283 |
| Nearest City | Holland (34 km) |
| Population Exposed | 113.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-11T00:12:00.000Z |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | South Haven to Holland MI; Holland to Grand Haven MI; Grand Haven to Whitehall MI; Lake Michigan from Grand Haven to Whitehall MI 5NM offshore to Mid Lake; Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid Lake; Lake Michigan from South Haven to Holland MI 5NM offshore to Mid lake |
| Headline | Special Marine Warning issued March 10 at 8:12PM EDT until March 10 at 9:15PM EDT by NWS Grand Rapids MI |
| Expires | 2026-03-10T21:15:00-04:00 |
| 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 Holland (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.