This alert expired on 12 June 2026 at 00:45 UTC. It is kept here as a record.
It is the 5th strongest of the 21 detections recorded within 20 km of this point since 27 April 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 11 at 7:10PM CDT until June 11 at 7:45PM CDT by NWS Milwaukee/Sullivan WI
An estimated 866,916 people live within 50 km of this point.
Nearby, since 27 April 2026
- June 11, 2026 · score 41 · 2.5 km
- June 12, 2026 · score 41 · 8.5 km
- June 10, 2026 · score 46 · 17.0 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 | 42.8758, -87.3663 |
| Nearest City | Racine (37 km) |
| Population Exposed | 866.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-12T00:10:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.ec9f0bfeb205d1c7ed90bf61dd9b7ecc |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Lake Michigan from Port Washington to North Point Light WI 5NM offshore to Mid Lake; Lake Michigan from North Point Light to Wind Point WI 5NM offshore to Mid Lake; Wind Point WI to Winthrop Harbor IL; Lake Michigan from North Point Light to Wind Point WI 5NM offshore to Mid Lake; Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM offshore to Mid Lake; Winthrop Harbor to Wilmette Harbor IL; Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake and 5 more areas |
| Headline | Special Marine Warning issued June 11 at 7:10PM CDT until June 11 at 7:45PM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-06-11T19:45:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["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.d8b42ba17b4049035f2e1a7d59a7cb14c57b245b.001.1","noaa_urn:oid:2.49.0.1.840.0.d5d8c1be3191659d8c7eff32441a7b78f9ef7ff0.001.1","noaa_urn:oid:2.49.0.1.840.0.3644aff7ff47dc84004c67f0c8f03136ec8d0470.001.1","noaa_urn:oid:2.49.0.1.840.0.812794ee8ea5fde2174b8088222d3e45b8c2fdbc.001.1","noaa_urn:oid:2.49.0.1.840.0.d354e4b752751ff303d45970d160cedb38a6b3e3.001.1"] |
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.