MILWAUKEE -

Storms pushed through central and southern counties of Wisconsin Wednesday night causing some damage with high winds and rain.

The sheriff's offices in Grant and Iowa counties reported no damage from the storm that moved through the area. Sauk County dispatchers told News 3 there was a partial roof collapse at the Walmart in Lake Delton. No injuries were reported.

“During the deluge of the rainfall…the roof collapsed in the back of the building back by their shipping and receiving portion of the building,” said Darren Jorgenson, Lake Delton fire chief.

Two employees reported injuries but no one was transported to the hospital, said Jorgenson.

Jorgenson said a 60 foot by 60 foot piece of the roof collapsed and compromised the exterior walls of the building.

Utilities have been cut off to the affected part of the building, Jorgenson said. The store is closed until further notice.

In Richland County, a wind gust estimated at 60 mph was reported around 4:30 p.m. in Port Andrew.

In Portage, storms left some streets flooded and knocked down at least two trees on the east side. There were no reports of injuries.

Street flooding was also reported in parts of the village of Boscobel in Grant County.

Utility crews are working to restore power to customers who lost service in the powerful storm.

More than 20,000 We Energies customers were left without service after winds of more than 50 mph caused power lines to go down. Only a fraction of those customers remained without power early Thursday.

Forecasters say some of the heaviest rain fell in Columbia and Dodge counties. Street flooding was reported in Portage and Pardeeville.

Weather spotters reported multiple funnel clouds near Guttenberg, Iowa, according to the National Weather Service.

A severe thunderstorm watch is in effect until 1 a.m. for Columbia, Dodge, Green Lake, Marquette and other counties to the east.

Any severe thunderstorms Wednesday afternoon bring the potential for damaging winds, hail, heavy rain, and perhaps an isolated tornado, with the main threat being the very strong winds. The severe weather threat will shift southeastward and increase with time for Illinois and Indiana, where a squall line with widespread damaging winds may develop and sweep eastward toward Washington D.C., by early Thursday morning.

Please monitor the latest forecasts on Channel3000.com through Wednesday in regard to the developing severe weather threat.