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 02:15 UTC. It is kept here as a record.
It is the 16th strongest of the 24 detections recorded within 20 km of this point since 10 June 2026. The last comparable one was on 10 June 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 11 at 6:18PM CDT until June 11 at 9:15PM CDT by NWS Chicago IL
Urban PEI: 4,964,690 within a heuristic 50 km radius; not unique people.
Nearby, since 10 June 2026
- July 27, 2026 · score 52 · 3.2 km
- August 10, 2026 · score 52 · 3.6 km
- July 3, 2026 · score 46 · 4.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 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) | 46 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 42.2650, -87.4575 |
| Nearest City | Highland Park (30 km) |
| Urban exposure index (PEI) | 5.0M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-11T23:18:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.8d18ef02f4fbd618215ef21390272c9552f4bcaf.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: 2026-06-11T23:18:00.000Z.
First archived: 2026-06-11T23:22:23.175Z. 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; Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake |
| Headline | Special Marine Warning issued June 11 at 6:18PM CDT until June 11 at 9:15PM CDT by NWS Chicago IL |
| Expires | 2026-06-11T21:15:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
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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