Flash Flood Warning — Waukesha County, Wisconsin
Flooding is imminent or already occurring. Move to higher ground immediately — never drive through flooded roads.
Current Status
🌊 Active: Flash Flood Warning
Flash Flood Warning issued September 3 at 10:14AM CDT until September 3 at 12:15PM CDT by NWS Milwaukee/Sullivan WI
At 1014 AM CDT, Doppler radar indicates another are of heavy rain over northeast Waukesha County moving east. Between 1.5 and 2 inches of rain have fallen. Additional rainfall amounts of 0.5 to 1 inch are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar indicated. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. Some locations that will experience flash flooding include... Northern Milwaukee, Wauwatosa, Brookfield, Menomonee Falls, Mequon, Whitefish Bay, Pewaukee, Brown Deer, Sussex, Fox Point, Bayside, Thiensville, Germantown, Glendale, Butler, River Hills, Lannon, Shorewood and Colgate.
Effective September 3, 2026 at 11:14 AM ET · Expires September 3, 2026 at 1:15 PM ET
Event Details
Event Type
Flash Flood Warning
Severity
severe
Issued By
NWS Milwaukee/Sullivan WI
Expires
September 3, 2026 at 1:15 PM ET
Last Checked
2 minutes ago
What To Do
📋 Official NWS Guidance
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
Also In Effect For
This same Flash Flood Warning also covers:
Other Active Alerts in Wisconsin
Flash Flood Warning
Flash Flood Warning
Flood Advisory
Flash Flood Warning
Flood Advisory
Flood Advisory
Get Flash Flood Warning Alerts for Waukesha County
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Frequently Asked Questions
What does a Flash Flood Warning mean for Waukesha County, Wisconsin?
Flooding is imminent or already occurring. Move to higher ground immediately — never drive through flooded roads.
Is this Flash Flood Warning currently active?
Yes — this alert is active as of our last check (2 minutes ago). It's set to expire September 3, 2026 at 1:15 PM ET.
How do I get notified about Flash Flood Warning alerts for Waukesha County?
Download StormCast free on Google Play and set Waukesha County, Wisconsin as one of your monitored locations. StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.
What other areas does this alert cover?
This same Flash Flood Warning is also in effect for Washington County, Milwaukee County, Ozaukee County.