Right now
The most recent data we hold from NOAA arrived 6 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 19 May 2026 at 22:05 UTC. It is kept here as a record.
It is the 10th strongest of the 70 detections recorded within 20 km of this point since 26 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 19 at 5:55PM EDT until May 19 at 6:00PM EDT by NWS Detroit/Pontiac MI
Urban PEI: 380,897 within a heuristic 50 km radius; not unique people.
Nearby, since 26 March 2026
- July 7, 2026 · score 43 · 13.1 km
- July 6, 2026 · score 43 · 13.1 km
- September 4, 2026 · score 37 · 14.9 km
How we know
4 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 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) | 43 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 41.7392, -83.2275 |
| Nearest City | Oregon (24 km) |
| Urban exposure index (PEI) | 380.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-19T21:55:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.a1e39d312b2df44ef91eb52baedd5c7d |
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: 2026-05-19T21:55:00.000Z.
First archived: 2026-05-19T21:56:45.477Z. 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; Maumee Bay to Reno Beach OH; Reno Beach to The Islands OH; The Islands to Vermilion OH; Detroit River Lt. to Maumee Bay OH to Reno Beach OH beyond 5NM offshoreline to US-Canadian border; Reno Beach to The Islands OH beyond 5NM off shoreline to US-Canadian border |
| Headline | Special Marine Warning issued May 19 at 5:55PM EDT until May 19 at 6:00PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-05-19T18:05:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a1e39d312b2df44ef91eb52baedd5c7da93c3f6a.001.1","noaa_urn:oid:2.49.0.1.840.0.41987a2c198de64574ff74d1d6a48aa7d395c201.001.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 40 |
| Iem Unit | mph |
| Iem City | Detroit River Light |
| Iem County | LEZ444 |
| Iem State | MI |
| Iem Wfo | DTX |
| MergedSources | [{"id":"iem_G_42.380_-83.370_1779222180000","source":"iem","severity":"low","severityValue":25,"timestamp":1779222180000,"latitude":42.38,"longitude":-83.37},{"id":"iem_G_41.940_-83.430_1779223680000","source":"iem","severity":"low","severityValue":25,"timestamp":1779223680000,"latitude":41.94,"longitude":-83.43},{"id":"iem_M_42.000_-83.140_1779225540000","source":"iem","severity":"low","severityValue":25,"timestamp":1779225540000,"latitude":42,"longitude":-83.14}] |
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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