This alert expired on 9 June 2026 at 02:45 UTC. It is kept here as a record.
It is the 4th strongest of the 11 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 8 at 9:41PM EDT until June 8 at 10:45PM EDT by NWS Grand Rapids MI
An estimated 113,930 people live within 50 km of this point.
Nearby, since 16 March 2026
- June 6, 2026 · score 39 · 13.7 km
- June 16, 2026 · score 43 · 14.3 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 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) | 37 / 100 |
| Our confidence | 80% |
| Coordinates | 43.0956, -86.5398 |
| Nearest City | Norton Shores (24 km) |
| Population Exposed | 113.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-09T01:41:00.000Z |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | 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; Holland to Grand Haven MI; Grand Haven to Whitehall MI; Lake Michigan from Whitehall to Pentwater MI 5NM offshore to Mid Lake; 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 8 at 9:41PM EDT until June 8 at 10:45PM EDT by NWS Grand Rapids MI |
| Expires | 2026-06-08T22:45:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.711ff0aace207b89124479cb2dc40fe8cfdf63e2.001.1","noaa_urn:oid:2.49.0.1.840.0.59d0f041c31f569855e6d7450f6a2d405edd8a7a.001.1"] |
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 Norton Shores (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.