Right now
The most recent data we hold from NOAA arrived 22 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
This alert expired on 28 June 2026 at 23:30 UTC. It is kept here as a record.
What the source measured
NOAA reported: Special Marine Warning issued June 28 at 4:35PM CDT until June 28 at 6:30PM CDT by NWS Milwaukee/Sullivan WI
Urban PEI: 2,110,464 within a heuristic 50 km radius; not unique people.
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 52 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) | 52 / 100 |
| Legacy data-support index | 0.84/1 |
| Coordinates | 42.3324, -87.5072 |
| Nearest City | North Chicago (27 km) |
| Urban exposure index (PEI) | 2.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-28T21:35:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.43ad5ae6b6b58cb571b170440f94b621 |
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: 2026-06-28T21:35:00.000Z.
First archived: 2026-06-28T21:59:22.539Z. 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 | North Point Light to Wind Point WI; Wind Point WI to Winthrop Harbor IL; Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM offshore to Mid Lake; Winthrop Harbor to Wilmette Harbor IL; Wilmette Harbor to Northerly Island IL; Northerly Island to Calumet Harbor IL; Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake; Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake |
| Headline | Special Marine Warning issued June 28 at 4:35PM CDT until June 28 at 6:30PM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-06-28T18:30:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.43ad5ae6b6b58cb571b170440f94b621e9e25969.001.1","noaa_urn:oid:2.49.0.1.840.0.8fedf44b64ac56428673422339940d3307ebe77a.001.1"] |
| Google News RssFeed | weather |
| Google News SourceName | ABC7 Chicago |
| MergedSources | [{"id":"gnews_weather_495187_112","source":"google_news","severity":"medium","severityValue":40,"timestamp":1782675983000,"latitude":41.85,"longitude":-87.65}] |
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.
Review the area, threshold and delivery channel in your account.
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