Right now
The most recent data we hold from NOAA arrived 2 hours 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 00:30 UTC. It is kept here as a record.
It is the 6th strongest of the 20 detections recorded within 20 km of this point since 27 April 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 11 at 6:38PM CDT until June 11 at 7:30PM CDT by NWS Milwaukee/Sullivan WI
Urban PEI: 638,360 within a heuristic 50 km radius; not unique people.
Nearby, since 27 April 2026
- June 16, 2026 · score 48 · 5.3 km
- July 9, 2026 · score 48 · 9.8 km
- June 12, 2026 · score 41 · 18.8 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.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 43.1172, -87.3491 |
| Nearest City | Cudahy (45 km) |
| Urban exposure index (PEI) | 638.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-11T23:38:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.812794ee8ea5fde2174b8088222d3e45 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-06-11T23:38:00.000Z.
First archived: 2026-06-11T23:48:25.004Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | 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; 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 and 2 more areas |
| Headline | Special Marine Warning issued June 11 at 6:38PM CDT until June 11 at 7:30PM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-06-11T19:30:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.812794ee8ea5fde2174b8088222d3e45b8c2fdbc.001.1","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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