Right now
The most recent data we hold from NOAA arrived 14 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 5 September 2026 at 05:30 UTC. It is kept here as a record.
It is the 29th strongest of the 34 detections recorded within 20 km of this point since 18 May 2026. The last comparable one was on 3 September 2026.
What the source measured
NOAA reported: Special Marine Warning issued September 4 at 11:12PM CDT until September 5 at 12:30AM CDT by NWS Chicago IL
Nearby, since 18 May 2026
- June 8, 2026 · score 43 · 4.7 km
- July 27, 2026 · score 43 · 8.3 km
- August 9, 2026 · score 22 · 9.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 16 out of 100, at 62 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 62% |
| Coordinates | 42.2905, -87.1815 |
| Nearest City | Evanston (50 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-05T04:12:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.a017ef82ffb0543bc2a73a2e9e44e0f5127dacef.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake; St Joseph to South Haven MI; Lake Michigan from St Joseph to South Haven MI 5NM offshore to Mid Lake; Winthrop Harbor to Wilmette Harbor IL; Wilmette Harbor to Northerly Island 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 and 1 more areas |
| Headline | Special Marine Warning issued September 4 at 11:12PM CDT until September 5 at 12:30AM CDT by NWS Chicago IL |
| Expires | 2026-09-05T00:30:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a017ef82ffb0543bc2a73a2e9e44e0f5127dacef.001.1","noaa_urn:oid:2.49.0.1.840.0.ab73912da6de04090fa3f5b4d886e4dcdb5facc5.001.1","noaa_urn:oid:2.49.0.1.840.0.752b3278be0ab24a8905b6f9f15b9ddd7cd50f30.001.1","noaa_urn:oid:2.49.0.1.840.0.2eab3fa678944a15f6f4e9d3f2fc6ebc54ace862.001.1"] |
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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 16/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.