Right now
The most recent data we hold from NOAA arrived 48 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 18 May 2026 at 22:30 UTC. It is kept here as a record.
No stronger detection stands among the 17 recorded within 20 km of this point since 9 May 2026 — 10 others scored the same. The last comparable one was on 9 May 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 18 at 6:14PM EDT until May 18 at 6:30PM EDT by NWS Detroit/Pontiac MI
Urban PEI: 2,265,710 within a heuristic 50 km radius; not unique people.
Nearby, since 9 May 2026
- July 3, 2026 · score 52 · 8.8 km
- June 12, 2026 · score 52 · 9.4 km
- June 12, 2026 · score 52 · 16.6 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 | 0.90/1 |
| Coordinates | 42.1662, -82.7981 |
| Nearest City | Kingsville (9 km) |
| Urban exposure index (PEI) | 2.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T22:14:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.3168d86b054d07a7a323d8166e47db1b |
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: 2026-05-18T22:14:00.000Z.
First archived: 2026-05-18T22:26:22.400Z. 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; Port Austin to Harbor Beach MI; Harbor Beach to Port Sanilac MI; Port Sanilac to Port Huron MI; Lake Huron from Port Austin to Harbor Beach 5NM Off Shore to the US/Canadian border; Lake Huron from Harbor Beach to Port Sanilac 5NM Off Shore to US/Canadian border; Lake Huron from Port Sanilac to Port Huron 5NM Off Shore to US/Canadian border; Reno Beach to The Islands OH; Reno Beach to The Islands OH beyond 5NM off shoreline to US-Canadian border; Reno Beach to The Islands OH; The Islands to Vermilion OH; Reno Beach to The Islands OH beyond 5NM off shoreline to US-Canadian border; The Islands to Vermilion OH beyond 5 nm off shoreline to US-Canadian border |
| Headline | Special Marine Warning issued May 18 at 6:14PM EDT until May 18 at 6:30PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-05-18T18:30:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.3168d86b054d07a7a323d8166e47db1b50a6db07.001.1","noaa_urn:oid:2.49.0.1.840.0.daff0484f62fc96603494e963df6fd6aba307d54.002.1","noaa_urn:oid:2.49.0.1.840.0.1e577237abf9bb50e43f5f264f1e4d94fb4c4ba9.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 58 |
| 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 | ClickOnDetroit | WDIV Local 4 |
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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