This alert expired on 16 June 2026 at 20:30 UTC. It is kept here as a record.
It is the 2nd 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. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 16 at 3:20PM CDT until June 16 at 3:30PM CDT by NWS Milwaukee/Sullivan WI
An estimated 638,360 people live within 50 km of this point.
Nearby, since 27 April 2026
- June 11, 2026 · score 41 · 5.3 km
- July 9, 2026 · score 48 · 7.5 km
- June 12, 2026 · score 41 · 13.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 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) | 48 / 100 |
| Our confidence | 80% |
| Coordinates | 43.0697, -87.3452 |
| Nearest City | Cudahy (44 km) |
| Population Exposed | 638.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-16T20:20:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.95096589e3425f4cc229edc8e19874d2 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | 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; 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; Sheboygan to Port Washington 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 |
| Headline | Special Marine Warning issued June 16 at 3:20PM CDT until June 16 at 3:30PM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-06-16T15:30:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.95096589e3425f4cc229edc8e19874d2787dfa32.001.1","noaa_urn:oid:2.49.0.1.840.0.3702ed4b3db2f43eeb2c944969cb1a438875af39.001.1","noaa_urn:oid:2.49.0.1.840.0.200da1be067e4ce5c823cedc9bbb86616d726333.001.1"] |
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 48/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.