Right now
The most recent data we hold from NOAA arrived 9 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 12 June 2026 at 01:30 UTC. It is kept here as a record.
It is the 14th strongest of the 19 detections recorded within 20 km of this point since 10 June 2026. The last comparable one was on 10 June 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 11 at 7:36PM EDT until June 11 at 9:30PM EDT by NWS Grand Rapids MI
An estimated 74,829 people live within 50 km of this point.
Nearby, since 10 June 2026
- June 12, 2026 · score 41 · 6.9 km
- June 16, 2026 · score 48 · 8.8 km
- June 11, 2026 · score 41 · 12.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 32 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) | 32 / 100 |
| Our confidence | 80% |
| Coordinates | 43.0012, -87.2906 |
| Nearest City | Cudahy (47 km) |
| Population Exposed | 74.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-11T23:36:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.1f2592961a63f3f9fc730a215136ac21 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | 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; Sturgeon Bay to Two Rivers WI; Two Rivers to Sheboygan WI; Lake Michigan from Sturgeon Bay to Two Rivers WI 5NM offshore to Mid Lake; Lake Michigan from Two Rivers to Sheboygan WI 5NM offshore to Mid Lake; Port Washington to North Point Light WI; North Point Light to Wind Point WI; Wind Point WI to Winthrop Harbor IL; 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; Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM offshore to Mid Lake and 1 more areas |
| Headline | Special Marine Warning issued June 11 at 7:36PM EDT until June 11 at 9:30PM EDT by NWS Grand Rapids MI |
| Expires | 2026-06-11T21:30:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1f2592961a63f3f9fc730a215136ac21a5c9b241.001.1","noaa_urn:oid:2.49.0.1.840.0.ada6f99a0d2b06414576e3a3cbd54046a236ef5f.001.1","noaa_urn:oid:2.49.0.1.840.0.d354e4b752751ff303d45970d160cedb38a6b3e3.001.1","noaa_urn:oid:2.49.0.1.840.0.8d18ef02f4fbd618215ef21390272c9552f4bcaf.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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