Tornado Warning Issued for Southern Waukesha County, WI
This alert is no longer in effect.
NOAA issued it on August 18, 2026, 5 days ago. Warnings of this kind stay in effect for hours to a few days, so this page is a historical record of what was issued, not a current warning. For conditions where you are right now, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia).
Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.
A Tornado Warning is in effect for southern Waukesha County in southeastern Wisconsin until 7:15 PM CDT on August 18.
Read this weather record in 30 seconds
- Record type
- Tornado Warning
- Affected area
- Southern Waukesha County, Wisconsin
- Issued
- August 18, 2026
- Issuing authority
- NWS Milwaukee/Sullivan WI
Tornado warnings are short-window notices for the named area. The issuing office is the authority on whether the warning remains active or has been replaced.
Record status: historical. It was issued 5 days ago; use the issuing agency's live warning service for current conditions in Southern Waukesha County, Wisconsin.
Alert Details
A Tornado Warning has been issued by the National Weather Service Milwaukee/Sullivan WI. The alert is effective from 6:42 PM CDT until 7:15 PM CDT on August 18, 2026. The event code is TOW with VTEC /O.NEW.KMKX.TO.W.0084.260818T2342Z-260819T0015Z/.
Affected Areas
Southern Waukesha County in southeastern Wisconsin. Locations impacted include Waukesha, New Berlin, Brookfield, Muskego, Pewaukee, Big Bend, Vernon, Waterville, Lapham Peak St Park, Genesee Depot, Genesee, and Summit. Landmarks include Pewaukee Lake and Pinewoods Campground.
What You Should Do
TAKE COVER NOW! Move to a basement or an interior room on the lowest floor of a sturdy building. Avoid windows. If you are outdoors, in a mobile home, or in a vehicle, move to the closest substantial shelter and protect yourself from flying debris.
Expected Conditions
A severe thunderstorm capable of producing a tornado was located over Pewaukee, moving southeast at 40 mph. Radar indicated rotation. Max hail size up to 0.75 inches. Impacts include flying debris, damage to mobile homes, roofs, windows, vehicles, and trees.
Timeline
The warning is effective immediately from 6:42 PM CDT and remains in effect until 7:15 PM CDT on August 18, 2026.
Original source: NOAA Official Notice ↗
Related Weather Alerts
All Weather Alerts →Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this NWS weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,243 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to August 18, 2026.
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