This alert expired on 4 September 2026 at 06:15 UTC. It is kept here as a record.
It is the 5th strongest of the 48 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 2 September 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 4 at 12:22AM CDT until September 4 at 1:15AM CDT by NWS Green Bay WI
An estimated 242,845 people live within 50 km of this point.
Nearby, since 15 March 2026
- September 4, 2026 · score 49 · 4.0 km
- July 2, 2026 · score 43 · 11.4 km
- June 6, 2026 · score 37 · 14.4 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 49 out of 100, at 87 % 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 | High |
| Calamity Score (ours) | 49 / 100 |
| Our confidence | 87% |
| Coordinates | 43.9706, -88.5733 |
| Nearest City | Oshkosh (6 km) |
| Population Exposed | 242.8K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-04T05:22:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.792c1caead1847da43c379bb07e0ae711ae6d701.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Portage, WI; Waupaca, WI; Menominee, WI; Shawano, WI; Milwaukee, WI; Ozaukee, WI; Washington, WI; Waukesha, WI and 1 more areas |
| Headline | Severe Thunderstorm Warning issued September 4 at 12:22AM CDT until September 4 at 1:15AM CDT by NWS Green Bay WI |
| Expires | 2026-09-04T01:15:00-05:00 |
| SenderName | NWS Green Bay WI |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.792c1caead1847da43c379bb07e0ae711ae6d701.001.1","noaa_urn:oid:2.49.0.1.840.0.978a6b7e9b4ee57dc57dfe0fbc22113ad77fe88a.001.1","noaa_urn:oid:2.49.0.1.840.0.43e7123d3283f3734065d7869c6cc12214448d7f.002.1","noaa_urn:oid:2.49.0.1.840.0.e11d8b45c380a8075f70462ea7dd3b6c7467aadb.002.1"] |
| Spc ReportType | hail |
| Spc Speed | 175 |
| Spc Location | Mayville |
| Spc County | Dodge |
| Spc State | WI |
| Spc Comments | Relay report from NWSChat. (MKX) |
| MergedSources | [{"id":"spc_wind_43.41_-88.53_257","source":"spc","severity":"medium","severityValue":45,"timestamp":1788496200000,"latitude":43.41,"longitude":-88.53},{"id":"spc_wind_43.46_-88.56_258","source":"spc","severity":"medium","severityValue":45,"timestamp":1788496620000,"latitude":43.46,"longitude":-88.56},{"id":"spc_hail_43.50_-88.56_283","source":"spc","severity":"high","severityValue":65,"timestamp":1788496080000,"latitude":43.5,"longitude":-88.56},{"id":"spc_hail_43.50_-88.55_284","source":"spc","severity":"high","severityValue":65,"timestamp":1788496320000,"latitude":43.5,"longitude":-88.55}] |
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 Oshkosh?
Calamity.live data shows a weather event with CalamityScore 49/100, near Oshkosh (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.