This alert expired on 9 June 2026 at 00:30 UTC. It is kept here as a record.
It is the 26th strongest of the 28 detections recorded within 20 km of this point since 10 March 2026. The last comparable one was on 8 June 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 8 at 8:04PM EDT until June 8 at 8:30PM EDT by NWS Grand Rapids MI
Nearby, since 10 March 2026
- June 8, 2026 · score 16 · 2.5 km
- July 27, 2026 · score 22 · 9.3 km
- June 6, 2026 · score 22 · 12.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 16 out of 100, at 60 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 60% |
| Coordinates | 42.5155, -86.7830 |
| Nearest City | Holland (63 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-09T00:04:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.c1fc275be86b5598bf9795769d8a7b62 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | St Joseph to South Haven MI; Lake Michigan from St Joseph to South Haven MI 5NM offshore to Mid Lake; South Haven to Holland MI; Lake Michigan from South Haven to Holland MI 5NM offshore to Mid lake; Lake Michigan from North Point Light to Wind Point WI 5NM offshore to Mid Lake; Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM offshore to Mid Lake |
| Headline | Special Marine Warning issued June 8 at 8:04PM EDT until June 8 at 8:30PM EDT by NWS Grand Rapids MI |
| Expires | 2026-06-08T20:30:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c1fc275be86b5598bf9795769d8a7b62cdb49f46.001.1","noaa_urn:oid:2.49.0.1.840.0.ec9602b3f4f78a56d1e18c11fe4e571112fd7922.001.1","noaa_urn:oid:2.49.0.1.840.0.64b57e859e8e922110d00e5b8994532442c37d2b.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 8 March 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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 16/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.