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 21 July 2026 at 02:00 UTC. It is kept here as a record.
It is the 3rd strongest of the 10 detections recorded within 20 km of this point since 29 June 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 20 at 9:24PM EDT until July 20 at 10:00PM EDT by NWS Marquette MI
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 16 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) | 16 / 100 |
| Legacy data-support index | 0.60/1 |
| Coordinates | 45.5822, -86.2134 |
| Nearest City | Traverse City (103 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-21T01:24:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.ee4ef10e9e59cebe78cab69b47227710 |
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: 2026-07-21T01:24:00.000Z.
First archived: 2026-07-21T01:30:10.882Z. 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 | Seul Choix Point to Point Detour MI; Lake Michigan from Seul Choix Point to Rock Island Passage 5NM offshore to Mid Lake; Green Bay North of line from Cedar River MI to Rock Island Passage; Seul Choix Point to Point Detour MI; 5NM East of a line from Fairport MI to Rock Island Passage; Lake Michigan from Seul Choix Point to Rock Island Passage 5NM offshore to Mid Lake; Rock Island Passage to Sturgeon Bay WI; Lake Michigan from Rock Island Passage to Sturgeon Bay WI 5NM offshore to mid lake and 3 more areas |
| Headline | Special Marine Warning issued July 20 at 9:24PM EDT until July 20 at 10:00PM EDT by NWS Marquette MI |
| Expires | 2026-07-20T22:00:00-04:00 |
| SenderName | NWS Marquette MI |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ee4ef10e9e59cebe78cab69b47227710535183b5.001.1","noaa_urn:oid:2.49.0.1.840.0.41ce0163115187a4dcccc8b86eb9e32804668b41.001.1","noaa_urn:oid:2.49.0.1.840.0.83c1f35636cf4c7959f0102bee02abc97518d29f.001.1","noaa_urn:oid:2.49.0.1.840.0.b6d52556f0de4a923e44b8a9bd793a81c3ebcb1e.001.1","noaa_urn:oid:2.49.0.1.840.0.0fc5b8f093c08d60ce9b52c1973e3cca6fe8b679.001.1","noaa_urn:oid:2.49.0.1.840.0.f15798776f6ea0a3ec77b1cbfc9d1d3dca537e97.001.1"] |
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.
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