Right now
The most recent data we hold from NOAA arrived 20 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 10 June 2026 at 23:15 UTC. It is kept here as a record.
It is the 15th strongest of the 48 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 6 June 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 10 at 6:34PM EDT until June 10 at 7:15PM EDT by NWS Grand Rapids MI
Nearby, since 15 March 2026
- September 2, 2026 · score 16 · 14.8 km
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 | 44.2627, -86.3396 |
| Nearest City | Traverse City (79 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-10T22:34:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.edc6ffc24df1f57139587d2ea8c62419 |
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: 2026-06-10T22:34:00.000Z.
First archived: 2026-06-10T22:41:41.397Z. 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 Joseph to South Haven MI; South Haven to Holland MI; Lake Michigan from South Haven to Holland MI 5NM offshore to Mid lake; Lake Michigan from St Joseph to South Haven MI 5NM offshore to Mid Lake; Holland to Grand Haven MI; Grand Haven to Whitehall MI; Whitehall to Pentwater MI; Pentwater to Manistee MI; Lake Michigan from Pentwater to Manistee MI 5NM offshore to Mid Lake; Lake Michigan from Whitehall to Pentwater MI 5NM offshore to Mid Lake; Lake Michigan from Grand Haven to Whitehall MI 5NM offshore to Mid Lake; Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid Lake; Grand Traverse Bay south of a line Grand Traverse Light to Norwood MI; Norwood MI to 5NM West of Mackinac Bridge including Little Traverse Bay and 3 more areas |
| Headline | Special Marine Warning issued June 10 at 6:34PM EDT until June 10 at 7:15PM EDT by NWS Grand Rapids MI |
| Expires | 2026-06-10T19:15:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.edc6ffc24df1f57139587d2ea8c6241917e8eda9.001.1","noaa_urn:oid:2.49.0.1.840.0.0b053af04ac98128fa0e5ca28803c8657344b0b3.001.1","noaa_urn:oid:2.49.0.1.840.0.7dfffa1cefe2f762128d8111a629e6ee50dcbc30.001.1","noaa_urn:oid:2.49.0.1.840.0.6e64deea4923d66b6afe5885aa60be8467635ba2.001.1","noaa_urn:oid:2.49.0.1.840.0.9bc1b9caa997ea3307ed65f80c27bbf65b1a02f3.001.1","noaa_urn:oid:2.49.0.1.840.0.8a0db34808f64c0b41a15106a42cf8e328005b75.001.1"] |
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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