Right now
The most recent data we hold from NOAA arrived 2 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 8th strongest of the 24 detections recorded within 20 km of this point since 27 April 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 11 at 7:59PM EDT until June 11 at 9:30PM EDT by NWS Grand Rapids MI
An estimated 767,058 people live within 50 km of this point.
Nearby, since 27 April 2026
- June 12, 2026 · score 41 · 2.5 km
- June 12, 2026 · score 41 · 6.1 km
- June 10, 2026 · score 46 · 19.0 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 | 42.8950, -87.3504 |
| Nearest City | Racine (40 km) |
| Population Exposed | 767.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-11T23:59:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.d8b42ba17b4049035f2e1a7d59a7cb14 |
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; Wilmette Harbor to Northerly Island IL; Northerly Island to Calumet Harbor IL; Calumet Harbor IL to Gary IN; Gary to Burns Harbor IN; Burns Harbor to Michigan City IN; Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake and 3 more areas |
| Headline | Special Marine Warning issued June 11 at 7:59PM 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 | 6 |
| MergedIds | ["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","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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