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 4 July 2026 at 00:30 UTC. It is kept here as a record.
It is the 3rd strongest of the 21 detections recorded within 20 km of this point since 5 May 2026. The last comparable one was on 25 June 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 3 at 7:05PM EDT until July 3 at 8:30PM EDT by NWS Detroit/Pontiac MI
Urban PEI: 2,206,152 within a heuristic 50 km radius; not unique people.
Nearby, since 5 May 2026
- July 3, 2026 · score 52 · 3.4 km
- May 9, 2026 · score 52 · 15.9 km
- September 3, 2026 · score 58 · 16.7 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 | 0.88/1 |
| Coordinates | 42.4350, -82.6241 |
| Nearest City | Saint Clair Shores (23 km) |
| Urban exposure index (PEI) | 2.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-03T23:05:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.4561b12f376749ee1625bf6aa5117a55 |
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: 2026-07-03T23:05:00.000Z.
First archived: 2026-07-03T23:13:20.109Z. 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; Harbor Beach to Port Sanilac MI; Port Sanilac to Port Huron MI; 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; 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; St. Clair River; Detroit River; Lake St. Clair Open Lake (U.S. Portion) |
| Headline | Special Marine Warning issued July 3 at 7:05PM EDT until July 3 at 8:30PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-07-03T20:30:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4561b12f376749ee1625bf6aa5117a55185212a4.001.1","noaa_urn:oid:2.49.0.1.840.0.cc681760f528a2cfc44bbe11d3df0b47a2d1f65b.002.1","noaa_urn:oid:2.49.0.1.840.0.121a0dc698b61fb6a0833071aa11d9dde41a9cb1.002.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 62 |
| Iem Unit | mph |
| Iem City | Oakland County Intl Air |
| Iem County | Oakland |
| Iem State | MI |
| Iem Wfo | DTX |
| Google News RssFeed | weather |
| Google News SourceName | The Detroit News |
| MergedSources | [{"id":"iem_G_42.660_-83.410_1783118160000","source":"iem","severity":"low","severityValue":25,"timestamp":1783118160000,"latitude":42.66,"longitude":-83.41},{"id":"gnews_weather_495310_217","source":"google_news","severity":"medium","severityValue":40,"timestamp":1783116120000,"latitude":42.33,"longitude":-83.05}] |
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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