This alert expired on 11 June 2026 at 22:30 UTC. It is kept here as a record.
It is the 14th strongest of the 23 detections recorded within 20 km of this point since 13 May 2026. The last comparable one was on 10 June 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 11 at 5:38PM EDT until June 11 at 6:30PM EDT by NWS Grand Rapids MI
Nearby, since 13 May 2026
- August 10, 2026 · score 22 · 5.2 km
- July 4, 2026 · score 22 · 12.3 km
- June 16, 2026 · score 34 · 12.5 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 | 42.4040, -86.4980 |
| Nearest City | Holland (53 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-11T21:38:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.b8c06758b267bcc7adf520cd72713241922d7936.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | St Joseph to South Haven MI; South Haven to Holland MI; Lake Michigan from South Haven to Holland MI 5NM offshore to Mid lake; Lake Michigan from St Joseph to South Haven MI 5NM offshore to Mid Lake |
| Headline | Special Marine Warning issued June 11 at 5:38PM EDT until June 11 at 6:30PM EDT by NWS Grand Rapids MI |
| Expires | 2026-06-11T18:30:00-04:00 |
| 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 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.