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. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 9 at 3:02PM 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
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 86 % 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 | 86% |
| Coordinates | 42.5152, -82.8029 |
| Nearest City | Saint Clair Shores (7 km) |
| Population Exposed | 2.8M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-09T19:02:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.ad2bdf2cb7bea7f2bbf5628bec09bdfff990778f.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 3:02PM 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 |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | inch |
| Iem City | 2 E Clarkston |
| Iem County | Oakland |
| Iem State | MI |
| Iem Wfo | DTX |
| MergedSources | [{"id":"iem_H_42.730_-83.380_1778351220000","source":"iem","severity":"low","severityValue":25,"timestamp":1778351220000,"latitude":42.73,"longitude":-83.38}] |
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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