This alert expired on 28 July 2026 at 04:00 UTC. It is kept here as a record.
It is the 5th strongest of the 31 detections recorded within 20 km of this point since 31 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 27 at 11:44PM EDT until July 28 at 12:00AM EDT by NWS Detroit/Pontiac MI
An estimated 33,917 people live within 50 km of this point.
Nearby, since 31 March 2026
- September 2, 2026 · score 28 · 10.3 km
- July 9, 2026 · score 43 · 20.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 out of 100, at 81 % 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) | 34 / 100 |
| Our confidence | 81% |
| Coordinates | 43.9381, -83.5162 |
| Nearest City | Bay City (49 km) |
| Population Exposed | 33.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-28T03:44:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.23ff2917dfa1b77ecbb33b8e0acb274debfdfacc.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw Bay; Inner Saginaw Bay SW of Point Au Gres to Bay Port MI |
| Headline | Special Marine Warning issued July 27 at 11:44PM EDT until July 28 at 12:00AM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-07-28T00:00:00-04:00 |
| SenderName | NWS Detroit/Pontiac 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 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.