This alert expired on 9 August 2026 at 17:30 UTC. It is kept here as a record.
No stronger detection stands among the 18 recorded within 20 km of this point since 31 March 2026 — 4 others scored the same. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued August 9 at 11:57AM CDT until August 9 at 12:30PM CDT by NWS Milwaukee/Sullivan WI
An estimated 573,316 people live within 50 km of this point.
Nearby, since 31 March 2026
- July 3, 2026 · score 46 · 7.2 km
- June 11, 2026 · score 41 · 9.5 km
- July 27, 2026 · score 46 · 13.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 48 out of 100, at 81 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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) | 48 / 100 |
| Our confidence | 81% |
| Coordinates | 42.6369, -87.5812 |
| Nearest City | Racine (19 km) |
| Population Exposed | 573.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-09T16:57:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.d731b01edb802543184b7b2bc629d68d |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Sheboygan to Port Washington WI; Port Washington to North Point Light WI; North Point Light to Wind Point WI; Wind Point WI to Winthrop Harbor IL; Lake Michigan from Sheboygan to Port Washington WI 5NM offshore to Mid Lake; Lake Michigan from Port Washington to North Point Light WI 5NM offshore to Mid Lake; 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; 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 August 9 at 11:57AM CDT until August 9 at 12:30PM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-08-09T12:30:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.d731b01edb802543184b7b2bc629d68d17613db9.001.1","noaa_urn:oid:2.49.0.1.840.0.33d3754b576412ec3528c3d9f1543e29f21d7445.001.1"] |
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 near Racine?
Calamity.live data shows a weather event with CalamityScore 48/100, near Racine (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.