This alert is in force until 3 September 2026, 17:15 UTC.
It is the 8th strongest of the 57 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Flash Flood Warning issued September 3 at 10:14AM CDT until September 3 at 12:15PM CDT by NWS Milwaukee/Sullivan WI
An estimated 1,224,465 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 27, 2026 · score 52 · 3.0 km
- July 27, 2026 · score 46 · 4.0 km
- April 3, 2026 · score 52 · 9.4 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 46 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) | 46 / 100 |
| Our confidence | 86% |
| Coordinates | 43.1494, -87.9676 |
| Nearest City | Mequon (9 km) |
| Population Exposed | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-03T15:14:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.29d34faa56535c0b9b6b1f30e96ee5cc19faace6.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Milwaukee, WI; Ozaukee, WI; Washington, WI; Waukesha, WI |
| Headline | Flash Flood Warning issued September 3 at 10:14AM CDT until September 3 at 12:15PM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-09-03T12:15:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 2 NE Hubertus |
| Spc County | Washington |
| Spc State | WI |
| Spc Comments | Washington County EM reports widespread tree damage across Richfield... including uprooted trees. Estimated winds 60 mph... time estimated by radar. (MKX) |
| MergedSources | [{"id":"spc_wind_43.26_-88.19_6","source":"spc","severity":"medium","severityValue":45,"timestamp":1788439620000,"latitude":43.26,"longitude":-88.19}] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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 Mequon?
Calamity.live data shows a weather event with CalamityScore 46/100, near Mequon (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.