This alert is in force until 2 September 2026, 11:30 UTC.
It is the 15th strongest of the 42 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Special Marine Warning issued September 2 at 5:23AM CDT until September 2 at 6:30AM CDT by NWS Green Bay WI
An estimated 48,327 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 2, 2026 · score 43 · 5.6 km
- May 17, 2026 · score 43 · 9.8 km
- July 8, 2026 · score 43 · 17.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 28 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 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) | 28 / 100 |
| Our confidence | 81% |
| Coordinates | 44.2194, -87.5194 |
| Nearest City | Manitowoc (18 km) |
| Population Exposed | 48.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T10:23:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.79bdaa5856626f7cbce30028825af2fc08345eef.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Sturgeon Bay to Two Rivers WI; Two Rivers to Sheboygan WI; Lake Michigan from Sturgeon Bay to Two Rivers WI 5NM offshore to Mid Lake; Lake Michigan from Two Rivers to Sheboygan WI 5NM offshore to Mid Lake |
| Headline | Special Marine Warning issued September 2 at 5:23AM CDT until September 2 at 6:30AM CDT by NWS Green Bay WI |
| Expires | 2026-09-02T06:30:00-05:00 |
| SenderName | NWS Green Bay 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 Manitowoc?
Calamity.live data shows a weather event with CalamityScore 28/100, near Manitowoc (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.