This alert expired on 2 September 2026 at 23:02 UTC. It is kept here as a record.
It is the 24th strongest of the 38 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: Severe Thunderstorm Warning issued September 2 at 6:53PM EDT until September 2 at 7:00PM EDT by NWS Detroit/Pontiac MI
An estimated 101,455 people live within 50 km of this point.
Nearby, since 4 April 2026
- May 18, 2026 · score 43 · 15.6 km
- July 21, 2026 · score 43 · 17.5 km
- June 25, 2026 · score 43 · 19.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 37 out of 100, at 80 % 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 | 80% |
| Coordinates | 43.1477, -82.7282 |
| Nearest City | Port Huron (32 km) |
| Population Exposed | 101.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T22:53:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.2b63dab2bdbaf6074278044cc233934661a4d440.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Lapeer, MI; Sanilac, MI; St. Clair, MI |
| Headline | Severe Thunderstorm Warning issued September 2 at 6:53PM EDT until September 2 at 7:00PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-09-02T19:02:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.2b63dab2bdbaf6074278044cc233934661a4d440.001.1","noaa_urn:oid:2.49.0.1.840.0.581b77324331afd8a88835aff0a07b5bbdf4be1f.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 37/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.