Right now
The most recent data we hold from NOAA arrived 4 minutes 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 22:00 UTC. It is kept here as a record.
It is the 8th strongest of the 94 detections recorded within 20 km of this point since 14 April 2026. The last comparable one was on 18 May 2026. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 19 at 4:55PM EDT until May 19 at 6:00PM EDT by NWS Detroit/Pontiac MI
Urban PEI: 2,631,045 within a heuristic 50 km radius; not unique people.
Nearby, since 14 April 2026
- June 14, 2026 · score 52 · 8.0 km
- April 15, 2026 · score 52 · 9.3 km
- September 3, 2026 · score 46 · 9.6 km
How we know
13 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 | 0.89/1 |
| Coordinates | 42.1475, -83.1150 |
| Nearest City | Trenton (5 km) |
| Urban exposure index (PEI) | 2.6M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-19T20:55:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.2bfb7442b0a30ad2e7551c6c4767f0a4 |
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: 2026-05-19T20:55:00.000Z.
First archived: 2026-05-19T21:10:20.329Z. 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 | Michigan Waters of Lake Erie from Detroit River to North Cape MI; St. Clair River; Detroit River; Lake St. Clair Open Lake (U.S. Portion) |
| Headline | Special Marine Warning issued May 19 at 4:55PM EDT until May 19 at 6:00PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-05-19T18:00:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.2bfb7442b0a30ad2e7551c6c4767f0a4d0bafd70.001.1","noaa_urn:oid:2.49.0.1.840.0.65c386b5a8f22e66e9f1b60e9e10f2d877423044.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 49 |
| Iem Unit | mph |
| Iem City | Oakland County Intl Air |
| Iem County | Oakland |
| Iem State | MI |
| Iem Wfo | DTX |
| Iem Remark | Measured at KPTK Pontiac Airport |
| Google News RssFeed | weather |
| Google News SourceName | The Detroit News |
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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