Right now
The most recent data we hold from NOAA arrived 54 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 25 June 2026 at 01:45 UTC. It is kept here as a record.
It is the 4th strongest of the 117 detections recorded within 20 km of this point since 10 March 2026. The last comparable one was on 24 June 2026. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued June 24 at 7:20PM CDT until June 24 at 8:45PM CDT by NWS Chicago IL
Urban PEI: 6,700,864 within a heuristic 50 km radius; not unique people.
Nearby, since 10 March 2026
- June 24, 2026 · score 52 · 1.4 km
- July 4, 2026 · score 52 · 6.3 km
- August 12, 2026 · score 52 · 7.3 km
How we know
5 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 | 0.89/1 |
| Coordinates | 41.7719, -87.4433 |
| Nearest City | South Chicago (10 km) |
| Urban exposure index (PEI) | 6.7M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-25T00:20:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.6ccb795cbba0f148c559c81f5487a1223cbc434a.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: 2026-06-25T00:20:00.000Z.
First archived: 2026-06-25T00:55:10.237Z. 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 | Wilmette Harbor to Northerly Island IL; Northerly Island to Calumet Harbor IL; Calumet Harbor IL to Gary IN; Gary to Burns Harbor IN; Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake |
| Headline | Special Marine Warning issued June 24 at 7:20PM CDT until June 24 at 8:45PM CDT by NWS Chicago IL |
| Expires | 2026-06-24T20:45:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| Google News RssFeed | weather |
| Google News SourceName | Chicago Sun-Times |
| MergedSources | [{"id":"gnews_weather_495091_138","source":"google_news","severity":"medium","severityValue":40,"timestamp":1782330721000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_495091_139","source":"google_news","severity":"medium","severityValue":40,"timestamp":1782327658000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_495094_140","source":"google_news","severity":"medium","severityValue":40,"timestamp":1782341096000,"latitude":41.85,"longitude":-87.65},{"id":"gnews_weather_495095_147","source":"google_news","severity":"medium","severityValue":40,"timestamp":1782345300000,"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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