This alert expired on 3 September 2026 at 07:30 UTC. It is kept here as a record.
No stronger detection stands among the 55 recorded within 20 km of this point since 14 April 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Special Marine Warning issued September 3 at 2:31AM EDT until September 3 at 3:30AM EDT by NWS Detroit/Pontiac MI
An estimated 3,041,164 people live within 50 km of this point.
Nearby, since 14 April 2026
- September 3, 2026 · score 58 · 0.0 km
- May 18, 2026 · score 52 · 4.1 km
- April 14, 2026 · score 52 · 4.1 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 58 out of 100, at 87 % 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 | High |
| Calamity Score (ours) | 58 / 100 |
| Our confidence | 87% |
| Coordinates | 42.4614, -82.8957 |
| Nearest City | Grosse Pointe Woods (3 km) |
| Population Exposed | 3.0M within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-03T06:31:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.7c34af46f96f64e48feae569a6af40220496c168.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Detroit River; Lake St. Clair Open Lake (U.S. Portion) |
| Headline | Special Marine Warning issued September 3 at 2:31AM EDT until September 3 at 3:30AM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-09-03T03:30:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| Spc ReportType | hail |
| Spc Speed | 150 |
| Spc Location | Kimball |
| Spc County | St. Clair |
| Spc State | MI |
| Spc Comments | (DTX) |
| MergedSources | [{"id":"spc_wind_42.93_-82.46_185","source":"spc","severity":"medium","severityValue":45,"timestamp":1788417672903,"latitude":42.93,"longitude":-82.46},{"id":"spc_hail_43.02_-82.95_303","source":"spc","severity":"high","severityValue":65,"timestamp":1788417672904,"latitude":43.02,"longitude":-82.95},{"id":"spc_hail_42.95_-82.56_304","source":"spc","severity":"high","severityValue":65,"timestamp":1788417672904,"latitude":42.95,"longitude":-82.56}] |
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 Grosse Pointe Woods?
Calamity.live data shows a weather event with CalamityScore 58/100, near Grosse Pointe Woods (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.