Right now
The most recent data we hold from NOAA arrived 4 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 28 June 2026 at 23:30 UTC. It is kept here as a record.
It is the 3rd strongest of the 62 detections recorded within 20 km of this point since 10 March 2026. The last comparable one was on 18 June 2026. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 28 at 4:31PM CDT until June 28 at 6:30PM CDT by NWS Chicago IL
Urban PEI: 6,341,718 within a heuristic 50 km radius; not unique people.
Nearby, since 10 March 2026
- June 12, 2026 · score 46 · 1.1 km
- June 18, 2026 · score 46 · 6.8 km
- July 27, 2026 · score 46 · 9.2 km
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 | 41.9959, -87.4176 |
| Nearest City | Uptown (19 km) |
| Urban exposure index (PEI) | 6.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-28T21:31:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.8fedf44b64ac56428673422339940d3307ebe77a.001.1 |
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: 2026-06-28T21:31:00.000Z.
First archived: 2026-06-28T21:32:51.645Z. 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 | 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 4:31PM CDT until June 28 at 6:30PM CDT by NWS Chicago IL |
| Expires | 2026-06-28T18:30:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| Google News RssFeed | weather |
| Google News SourceName | ABC7 Chicago |
| MergedSources | [{"id":"gnews_weather_495187_122","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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