Storms trigger tornado warnings in parts of southern Wisconsin Associated Press Storms swept across Wisconsin Friday afternoon and evening, dumping heavy rain in some areas and triggering tornado warnings, but no severe damage was reported. John Eise, science and operations officer with the National Weather Service in Sullivan, said Friday night that there had been reports of funnel clouds, rotating wall clouds and even tornadoes, but there so far were no reports of damage to substantiate any of those reports. He said the storms seemed most severe across south central Wisconsin, with some trees and power lines knocked down in southwestern Rock County. The Fond du Lac area was among the places that were under tornado warnings as the storms moved through, but the Fond du Lac County Sheriff's Department said no storm damage was reported. Forecasters said a strong low pressure system and trailing cool front dropping down across Wisconsin caused the showers and thunderstorms. Strong north winds were expected to move in after the low and pull cooler air across the state. Saturday's prediction showed partly to mostly sunny skies, breezy conditions and cool temperatures, with highs from the mid 50s to around 70. For Sunday, the forecast showed partly sunny skies and highs in the mid 60s to mid 70s.