Right now
The most recent data we hold from NOAA arrived 1 minute 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 19 May 2026 at 20:45 UTC. It is kept here as a record.
No stronger detection stands among the 43 recorded within 20 km of this point since 15 April 2026 — 15 others scored the same. 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 19 at 3:38PM EDT until May 19 at 4:45PM EDT by NWS Detroit/Pontiac MI
Urban PEI: 1,100,298 within a heuristic 50 km radius; not unique people.
Nearby, since 15 April 2026
- September 3, 2026 · score 46 · 1.6 km
- July 18, 2026 · score 52 · 11.3 km
- July 4, 2026 · score 52 · 12.4 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 52 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 42.6971, -82.6505 |
| Nearest City | Mount Clemens (22 km) |
| Urban exposure index (PEI) | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-19T19:38:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.0b11d3083d814d5892446b175b084116a6feb99f.001.1 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-05-19T19:38:00.000Z.
First archived: 2026-05-19T20:18:50.161Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | St. Clair River; Lake St. Clair Open Lake (U.S. Portion); Port Sanilac to Port Huron MI |
| Headline | Special Marine Warning issued May 19 at 3:38PM EDT until May 19 at 4:45PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-05-19T16:45:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | 2 N Washington |
| Iem County | Macomb |
| Iem State | MI |
| Iem Wfo | DTX |
| Iem Remark | Trees and wires reported down across portions of northern and northwest Macomb County |
| MergedSources | [{"id":"iem_D_42.760_-83.020_1779217620000","source":"iem","severity":"low","severityValue":25,"timestamp":1779217620000,"latitude":42.76,"longitude":-83.02},{"id":"iem_D_42.760_-83.020_1779220200000","source":"iem","severity":"low","severityValue":25,"timestamp":1779220200000,"latitude":42.76,"longitude":-83.02}] |
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.
Review the area, threshold and delivery channel in your account.
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