This alert expired on 9 July 2026 at 04:30 UTC. It is kept here as a record.
It is the 19th strongest of the 30 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 2 July 2026. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 8 at 9:57PM CDT until July 8 at 11:30PM CDT by NWS Milwaukee/Sullivan WI
An estimated 48,797 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 2, 2026 · score 34 · 5.8 km
- May 13, 2026 · score 48 · 17.7 km
- September 4, 2026 · score 37 · 20.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 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) | 34 / 100 |
| Our confidence | 81% |
| Coordinates | 43.6000, -87.6012 |
| Nearest City | Sheboygan (19 km) |
| Population Exposed | 48.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-09T02:57:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7e41547041074b11624aa77214c078f8d04c2e55.001.1 |
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; 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 |
| Headline | Special Marine Warning issued July 8 at 9:57PM CDT until July 8 at 11:30PM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-07-08T23:30:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| 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.
Want to know when something happens near Sheboygan?
Calamity.live data shows a weather event with CalamityScore 34/100, near Sheboygan (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.