This alert expired on 9 July 2026 at 02:00 UTC. It is kept here as a record.
It is the 6th strongest of the 11 detections recorded within 20 km of this point since 13 May 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 8 at 8:34PM EDT until July 8 at 10:00PM EDT by NWS Grand Rapids MI
Nearby, since 13 May 2026
- May 13, 2026 · score 39 · 14.3 km
- September 4, 2026 · score 32 · 18.3 km
- May 16, 2026 · score 39 · 19.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 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) | 22 / 100 |
| Our confidence | 60% |
| Coordinates | 43.5017, -86.8328 |
| Nearest City | Muskegon (56 km) |
| Impact Tier | minor |
| Timestamp | 2026-07-09T00:34:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.7398a820fddafb34340a9ef84c709fd1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Grand Haven to Whitehall MI; Whitehall to Pentwater 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; Whitehall to Pentwater MI; Lake Michigan from Whitehall to Pentwater MI 5NM offshore to Mid Lake |
| Headline | Special Marine Warning issued July 8 at 8:34PM EDT until July 8 at 10:00PM EDT by NWS Grand Rapids MI |
| Expires | 2026-07-08T22:00:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7398a820fddafb34340a9ef84c709fd135b7a556.001.1","noaa_urn:oid:2.49.0.1.840.0.f4dd403f2b05fed8df7c7be8cdddcba3e4bd90c4.002.1"] |
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 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.