There is a tornado warning for the Oconomowoc, Hartland and surrounding areas. Here is the National Weather Service bulletin:
... A Tornado Warning remains in effect for northern Jefferson and
northwestern Waukesha counties until 600 PM CDT...
At 521 PM CDT... National Weather Service Doppler radar indicated a
severe thunderstorm capable of producing a tornado. This dangerous
storm was located near Watertown Airport... or near Watertown... moving
east at 40 mph.
This dangerous storm will be near...
Okauchee Lake around 545 PM CDT.
Hartland... Delafield and Lapham peak State Park around 550 PM CDT.
Other locations impacted by this dangerous storm include
Pipersville... Ixonia... Lac La Belle... Monterey... Oconomowoc...
Mapleton... Oconomowoc Lake... stone bank... Chenequa and North Lake.
Take cover now. Move to an interior room on the lowest floor of a
sturdy building. Avoid windows. If in a Mobile home... a vehicle or
outdoors... move to the closest substantial shelter and protect
yourself from flying debris.