This alert expired on 3 September 2026 at 04:00 UTC. It is kept here as a record.
It is the 24th strongest of the 45 detections recorded within 20 km of this point since 14 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 11:52PM EDT until September 3 at 12:00AM EDT by NWS Detroit/Pontiac MI
An estimated 3,085,243 people live within 50 km of this point.
Nearby, since 14 April 2026
- May 9, 2026 · score 52 · 1.2 km
- July 3, 2026 · score 52 · 4.5 km
- June 10, 2026 · score 46 · 7.0 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 46 out of 100, at 92 % 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) | 46 / 100 |
| Our confidence | 92% |
| Coordinates | 42.3141, -82.9788 |
| Nearest City | Windsor (4 km) |
| Population Exposed | 3.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-03T03:52:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.6a5840754e1eed7d43022db1a894b567489aa05d.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | St. Clair River; Detroit River; Lake St. Clair Open Lake (U.S. Portion); Detroit River |
| Headline | Special Marine Warning issued September 2 at 11:52PM EDT until September 3 at 12:00AM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-09-03T00:00:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6a5840754e1eed7d43022db1a894b567489aa05d.001.1","noaa_urn:oid:2.49.0.1.840.0.aab77f28468d1d7f2a6d049dc650a9c3b42823eb.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 51 |
| Iem Unit | mph |
| Iem City | Detroit City Airport |
| Iem County | Wayne |
| Iem State | MI |
| Iem Wfo | DTX |
| Google News RssFeed | weather |
| Google News SourceName | The Detroit News |
| MergedSources | [{"id":"iem_G_42.410_-83.010_1788405420000","source":"iem","severity":"low","severityValue":25,"timestamp":1788405420000,"latitude":42.41,"longitude":-83.01},{"id":"gnews_weather_496779_202","source":"google_news","severity":"medium","severityValue":40,"timestamp":1788406560000,"latitude":42.33,"longitude":-83.05}] |
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 Windsor?
Calamity.live data shows a weather event with CalamityScore 46/100, near Windsor (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.