This alert expired on 12 June 2026 at 00:34 UTC. It is kept here as a record.
It is the 5th strongest of the 19 detections recorded within 20 km of this point since 27 April 2026. Another comparable one was recorded here earlier the same day. 11 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 11 at 7:25PM CDT until June 11 at 7:30PM CDT by NWS Green Bay WI
An estimated 740,786 people live within 50 km of this point.
Nearby, since 27 April 2026
- June 11, 2026 · score 41 · 6.1 km
- June 12, 2026 · score 41 · 8.5 km
- June 16, 2026 · score 48 · 13.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 41 out of 100, at 80 % 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) | 41 / 100 |
| Our confidence | 80% |
| Coordinates | 42.9487, -87.3369 |
| Nearest City | Cudahy (43 km) |
| Population Exposed | 740.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-12T00:25:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.9d0e370493a7ed9665366e0444e16049 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Lake Michigan from Two Rivers to Sheboygan WI 5NM offshore to Mid Lake; Sheboygan to Port Washington WI; Port Washington to North Point Light WI; Lake Michigan from Sheboygan to Port Washington WI 5NM offshore to Mid Lake; Lake Michigan from Port Washington to North Point Light WI 5NM offshore to Mid Lake; South Haven to Holland MI; Holland to Grand Haven MI; Grand Haven to Whitehall MI; 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; Lake Michigan from South Haven to Holland MI 5NM offshore to Mid lake and 4 more areas |
| Headline | Special Marine Warning issued June 11 at 7:25PM CDT until June 11 at 7:30PM CDT by NWS Green Bay WI |
| Expires | 2026-06-11T19:34:00-05:00 |
| SenderName | NWS Green Bay WI |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.9d0e370493a7ed9665366e0444e1604960ba28d8.001.1","noaa_urn:oid:2.49.0.1.840.0.e76f077f46d068b60dc91687f65ac6f5f4db8d9f.001.1","noaa_urn:oid:2.49.0.1.840.0.9d733c471c2269519e0d56b43f1dc827054371dd.001.1","noaa_urn:oid:2.49.0.1.840.0.ec9f0bfeb205d1c7ed90bf61dd9b7ecc24e5481c.001.1","noaa_urn:oid:2.49.0.1.840.0.8d693bb2c51c14960a41ae8985bd05c91b0ecc8c.001.1","noaa_urn:oid:2.49.0.1.840.0.a25fda3d7ddc60c85b0c72cf9175e3920490e42c.001.1","noaa_urn:oid:2.49.0.1.840.0.3644aff7ff47dc84004c67f0c8f03136ec8d0470.001.1","noaa_urn:oid:2.49.0.1.840.0.812794ee8ea5fde2174b8088222d3e45b8c2fdbc.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 41/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.