Image Source: WISN
Weather tornado warning alerts across southeast Wisconsin expired Tuesday night after a line of severe thunderstorms moved through the region. The storms produced dangerous conditions, including strong wind gusts, hail and heavy rain, while thousands of customers remained without power in Milwaukee, Waukesha and Washington counties.
Urgent Weather Tornado Warning Threat Finally Ends
By 9 p.m. CDT on Aug. 18, 2026, all severe thunderstorm warnings, tornado warnings and watches had expired, according to the latest update reported by WISN. Earlier in the evening, a severe thunderstorm watch covered several southeastern Wisconsin counties, with the National Weather Service warning that storms could produce gusty winds, small hail and intense rainfall.
The overall severe weather risk was classified as Level 1 out of 5, indicating a low risk. However, forecasters cautioned that isolated storms could still strengthen quickly and create hazardous conditions for drivers, homeowners and people outdoors.
Powerful Storms Trigger Multiple Warnings
The evening began with severe thunderstorm warnings in parts of Fond du Lac, Dodge, Washington, Sheboygan and Jefferson counties. The primary threats included wind gusts of up to 60 mph, hail as large as quarters and periods of heavy rain.
At 5:45 p.m., a tornado warning was issued for southwestern Dodge County. The storm was located about seven miles south of Rio and 10 miles west of Columbus, moving east at approximately 40 mph. That warning later expired at 6:30 p.m.
As the storm system moved east, additional alerts were issued. A tornado warning covered Washington and Waukesha counties until 7:15 p.m., while another tornado warning was issued for Milwaukee County until 7:30 p.m. Severe thunderstorm warnings also affected Milwaukee, Racine and Waukesha counties.
At 7:46 p.m., a severe thunderstorm watch remained in effect for Racine, Kenosha and Walworth counties. All other warnings and watches had been canceled at that time. By 9 p.m., however, the remaining alerts had also expired.
Milwaukee Area Power Outages Climb
The storms left a significant number of customers without electricity across the area. At 8:46 p.m., outage totals reported by WISN included:
- Milwaukee County: 22,827 power outages
- Waukesha County: 12,178 power outages
- Washington County: 2,477 power outages
Earlier updates showed outages rising rapidly as storms passed through the Milwaukee area. Milwaukee County had more than 18,000 outages by 7:25 p.m., while Waukesha County reported more than 9,500 outages shortly before 7:10 p.m.
Residents affected by the outages were urged to remain cautious after the weather tornado warning threat ended. Power lines may remain down even after skies begin to clear, and some roads could be covered by standing water or debris.
Critical Safety Reminders After Severe Weather
The expiration of a warning does not mean every hazard has disappeared. People should avoid approaching downed power lines and report them to the appropriate utility or emergency agency. Drivers should never cross a flooded roadway because water can conceal damaged pavement or sweep away a vehicle.
Residents who experienced storm damage should check their homes carefully for leaks, broken windows and structural problems. Anyone using a generator should operate it outdoors and away from doors, windows and other openings to prevent carbon monoxide poisoning.
People in southeastern Wisconsin should also keep weather alerts enabled through the night. Additional showers or thunderstorms can develop after the main line passes, and saturated ground may increase the risk of localized flooding.
What Residents Should Watch Next
Although the latest weather tornado warning alerts were canceled, cleanup and restoration efforts could continue into Wednesday. Power outages may take time to resolve, particularly in areas where trees or branches damaged utility equipment.
For the latest storm information, residents should monitor updates from the National Weather Service, local emergency officials and their electricity provider. WISN also advised viewers to use its interactive radar and continue following local forecasts as conditions change.
Frequently Asked Questions
Are all tornado warnings in Wisconsin canceled?
According to the latest WISN update at 9 p.m. Tuesday, all tornado warnings and severe weather watches connected to the storm had expired.
Which counties had the most power outages?
Milwaukee County had the highest reported total with 22,827 outages at 8:46 p.m. Waukesha County had 12,178, and Washington County had 2,477.
What were the main storm threats?
The main threats were damaging wind gusts, hail, heavy rain and possible localized flooding. Some warnings cited winds up to 60 mph and hail ranging from penny-size to quarter-size.
Should residents still be cautious after warnings expire?
Yes. Downed power lines, flooded roads, debris and additional thunderstorms can remain dangerous after official warnings end. Residents should continue monitoring trusted local weather and emergency updates.
