Right now
The most recent data we hold from NOAA arrived 3 hours ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 9 May 2026 at 20:00 UTC. It is kept here as a record.
It is the 6th strongest of the 100 detections recorded within 20 km of this point since 14 April 2026. The last comparable one was on 5 May 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 9 at 2:49PM EDT until May 9 at 4:00PM EDT by NWS Detroit/Pontiac MI
An estimated 2,765,826 people live within 50 km of this point.
Nearby, since 14 April 2026
- May 9, 2026 · score 52 · 1.3 km
- September 3, 2026 · score 58 · 2.5 km
- July 4, 2026 · score 52 · 3.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 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 v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 80% |
| Coordinates | 42.5152, -82.8029 |
| Nearest City | Saint Clair Shores (7 km) |
| Population Exposed | 2.8M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-09T18:49:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.b86dc2d5a1af8dab29c5b46b558e0cbb5e4ac0ab.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) |
| Headline | Special Marine Warning issued May 9 at 2:49PM EDT until May 9 at 4:00PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-05-09T16:00:00-04:00 |
| 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.
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