This alert expired on 2 September 2026 at 11:00 UTC. It is kept here as a record.
It is the 13th strongest of the 56 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 8 July 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 2 at 5:10AM CDT until September 2 at 6:00AM CDT by NWS Green Bay WI
An estimated 230,538 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 16, 2026 · score 43 · 12.2 km
- May 17, 2026 · score 43 · 12.7 km
- July 2, 2026 · score 43 · 14.8 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 37 out of 100, at 86 % 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) | 37 / 100 |
| Our confidence | 86% |
| Coordinates | 44.2362, -87.7694 |
| Nearest City | Manitowoc (18 km) |
| Population Exposed | 230.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T10:10:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.64f9342d87af264da27e7fe6772f100bb123481c.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Brown, WI; Calumet, WI; Kewaunee, WI; Manitowoc, WI |
| Headline | Severe Thunderstorm Warning issued September 2 at 5:10AM CDT until September 2 at 6:00AM CDT by NWS Green Bay WI |
| Expires | 2026-09-02T06:00:00-05:00 |
| SenderName | NWS Green Bay WI |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | 59 |
| Spc Location | 2 S Greenville |
| Spc County | Outagamie |
| Spc State | WI |
| Spc Comments | Measured at Appleton International Airport. (GRB) |
| MergedSources | [{"id":"spc_wind_44.31_-88.53_134","source":"spc","severity":"medium","severityValue":45,"timestamp":1788342660000,"latitude":44.31,"longitude":-88.53},{"id":"spc_wind_44.25_-88.53_135","source":"spc","severity":"medium","severityValue":45,"timestamp":1788342900000,"latitude":44.25,"longitude":-88.53}] |
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 37/100, near Manitowoc (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.