This alert expired on 2 September 2026 at 20:15 UTC. It is kept here as a record.
It is the 13th strongest of the 29 detections recorded within 20 km of this point since 31 March 2026. The last comparable one was on 28 July 2026.
What the source measured
NOAA reported: Special Marine Warning issued September 2 at 2:47PM EDT until September 2 at 4:15PM 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 · 6.2 km
- July 28, 2026 · score 34 · 9.5 km
- July 9, 2026 · score 43 · 11.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 28 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 v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 28 / 100 |
| Our confidence | 81% |
| Coordinates | 43.8937, -83.6174 |
| Nearest City | Bay City (40 km) |
| Population Exposed | 33.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T18:47:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.289dfb3ccc69ec2cba10bd4af5942abc0ac5f56a.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 September 2 at 2:47PM EDT until September 2 at 4:15PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-09-02T16:15:00-04:00 |
| 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 28/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.