This alert expired on 6 June 2026 at 06:00 UTC. It is kept here as a record.
It is the 2nd strongest of the 8 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 6 at 1:07AM EDT until June 6 at 2:00AM EDT by NWS Grand Rapids MI
An estimated 96,351 people live within 50 km of this point.
Nearby, since 10 March 2026
- June 16, 2026 · score 43 · 10.7 km
- June 9, 2026 · score 37 · 13.7 km
- March 11, 2026 · score 37 · 16.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 39 out of 100, at 80 % 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) | 39 / 100 |
| Our confidence | 80% |
| Coordinates | 42.9787, -86.5925 |
| Nearest City | Norton Shores (34 km) |
| Population Exposed | 96.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-06T05:07:00.000Z |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | 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 |
| Headline | Special Marine Warning issued June 6 at 1:07AM EDT until June 6 at 2:00AM EDT by NWS Grand Rapids MI |
| Expires | 2026-06-06T02:00:00-04:00 |
| 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 39/100, near Norton Shores (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.