This alert expired on 16 June 2026 at 22:00 UTC. It is kept here as a record.
It is the strongest of the 19 detections recorded within 20 km of this point since 10 March 2026. The last comparable one was on 9 June 2026. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 16 at 5:07PM EDT until June 16 at 6:00PM EDT by NWS Grand Rapids MI
An estimated 113,930 people live within 50 km of this point.
Nearby, since 10 March 2026
- June 6, 2026 · score 39 · 10.7 km
- June 9, 2026 · score 37 · 14.3 km
- March 10, 2026 · score 37 · 15.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 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) | 43 / 100 |
| Our confidence | 80% |
| Coordinates | 42.9800, -86.4614 |
| Nearest City | Norton Shores (27 km) |
| Population Exposed | 113.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-16T21:07:00.000Z |
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 16 at 5:07PM EDT until June 16 at 6:00PM EDT by NWS Grand Rapids MI |
| Expires | 2026-06-16T18:00:00-04:00 |
| 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 43/100, near Norton Shores (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.