This alert expired on 10 June 2026 at 23:15 UTC. It is kept here as a record.
It is the 8th strongest of the 10 detections recorded within 20 km of this point since 10 June 2026. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 10 at 6:10PM EDT until June 10 at 7:15PM EDT by NWS Grand Rapids MI
Nearby, since 10 June 2026
- July 1, 2026 · score 22 · 18.0 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, at 59 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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 |
| Our confidence | 59% |
| Coordinates | 44.0046, -86.7602 |
| Nearest City | Manitowoc (73 km) |
| Impact Tier | minor |
| Timestamp | 2026-06-10T22:10:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.5ac5b1cc5d734abdee9d34c8c1673b09 |
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; Sturgeon Bay to Two Rivers WI; Lake Michigan from Sturgeon Bay to Two Rivers WI 5NM offshore to Mid Lake and 5 more areas |
| Headline | Special Marine Warning issued June 10 at 6:10PM 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 | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5ac5b1cc5d734abdee9d34c8c1673b092978043c.001.1","noaa_urn:oid:2.49.0.1.840.0.31598e007ce05f7c7b6cc10b7e039c440b3ed37f.001.1","noaa_urn:oid:2.49.0.1.840.0.7af4599b89ece20a49f20b1131c4f31a52ec02ce.002.1","noaa_urn:oid:2.49.0.1.840.0.6e64deea4923d66b6afe5885aa60be8467635ba2.001.1","noaa_urn:oid:2.49.0.1.840.0.ea99439853224ce087ee17ca097d2c2635a2d352.001.1","noaa_urn:oid:2.49.0.1.840.0.9bc1b9caa997ea3307ed65f80c27bbf65b1a02f3.001.1","noaa_urn:oid:2.49.0.1.840.0.8a0db34808f64c0b41a15106a42cf8e328005b75.001.1","noaa_urn:oid:2.49.0.1.840.0.92a1583bc2209275d1be0b0a9f403bdd2290146c.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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 16/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.