This alert expired on 3 September 2026 at 00:00 UTC. It is kept here as a record.
It is the 39th strongest of the 59 detections recorded within 20 km of this point since 4 April 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Special Marine Warning issued September 2 at 7:10PM EDT until September 2 at 8:00PM EDT by NWS Detroit/Pontiac MI
An estimated 101,455 people live within 50 km of this point.
Nearby, since 4 April 2026
- June 25, 2026 · score 43 · 1.7 km
- July 21, 2026 · score 37 · 5.3 km
- September 3, 2026 · score 37 · 8.8 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 37 out of 100, at 90 % 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) | 37 / 100 |
| Our confidence | 90% |
| Coordinates | 43.0082, -82.4465 |
| Nearest City | Port Huron (5 km) |
| Population Exposed | 101.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T23:10:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.5358872c7384c112cd7912a7bd38fa5479f6c9ac.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | St. Clair River; Port Sanilac to Port Huron MI; Lake Huron from Port Sanilac to Port Huron 5NM Off Shore to US/Canadian border |
| Headline | Special Marine Warning issued September 2 at 7:10PM EDT until September 2 at 8:00PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-09-02T20:00:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5358872c7384c112cd7912a7bd38fa5479f6c9ac.001.1","noaa_urn:oid:2.49.0.1.840.0.1a51ccff5ca8fc93d53fe6311db472da8f189d99.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | Richmondville |
| Spc County | Sanilac |
| Spc State | MI |
| Spc Comments | EM reported significant damage over and west of Richmondville. (DTX) |
| Iem TypeSummary | M |
| Iem Magnitude | 47 |
| Iem Unit | mph |
| Iem City | Lexington Harbor |
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 near Port Huron?
Calamity.live data shows a weather event with CalamityScore 37/100, near Port Huron (Canada), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.