Right now
The most recent data we hold from NOAA arrived 6 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 4 September 2026 at 16:30 UTC. It is kept here as a record.
It is the 26th strongest of the 34 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 9 August 2026.
What the source measured
NOAA reported: Special Marine Warning issued September 4 at 10:41AM CDT until September 4 at 11:30AM CDT by NWS Milwaukee/Sullivan WI
Nearby, since 16 March 2026
- March 16, 2026 · score 22 · 9.7 km
- June 6, 2026 · score 22 · 13.2 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 | 42.7506, -87.0839 |
| Nearest City | Racine (57 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-04T15:41:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.fb73d5ee8ed75a238aca156a995f5c8f76bbdfed.001.1 |
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 North Point Light to Wind Point WI 5NM offshore to Mid Lake; Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM offshore to Mid Lake; South Haven to Holland MI; Holland to Grand Haven MI; Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid Lake; Lake Michigan from South Haven to Holland MI 5NM offshore to Mid lake |
| Headline | Special Marine Warning issued September 4 at 10:41AM CDT until September 4 at 11:30AM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-09-04T11:30:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.fb73d5ee8ed75a238aca156a995f5c8f76bbdfed.001.1","noaa_urn:oid:2.49.0.1.840.0.eb67a93188b2579f77a1903e0f02dc096ccfb6e2.001.1"] |
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.