Joe Taschler, Milwaukee Journal Sentinel
Rain, some possibly heavy, may fall across portions of southern Wisconsin during the next couple of days, forecasters say, and anyone planning to attend Farm Aid in East Troy — or any of the other big events across southern Wisconsin this weekend — will want to keep their rain gear handy.
A warm, humid air mass will be in place over southern Wisconsin on Saturday as a cold front approaches from the west, said Denny Van Cleve, a meteorologist at the National Weather Service office in Sullivan.
"We could see multiple rounds of showers and storms Saturday into Sunday," Van Cleve said.
"We'll be keeping an eye out as this system draws closer," he said. "There is still some uncertainty with how fast the front is going to move through."
The weather setup taking shape is similar to what we usually see during the middle of summer rather than the third week in September.
"There is the possibility of locally heavy rainfall," Van Cleve said. "There will be a pretty moist air mass across the area for this time of the year."
That forecast comes amid a weekend packed with outdoor events across southern Wisconsin.
In addition to Farm Aid, the Wisconsin Badgers play the Michigan Wolverines in a showdown of nationally ranked college football teams at 11 a.m. Saturday in Madison.
Meanwhile, thousands of baseball fans will be tailgating outside Miller Park as the Milwaukee Brewers, in the thick of a pennant race, wrap up their final homestand of the year.
Other big events taking place this weekend include the Bay View Bash and the Cedarburg Wine & Harvest Festival.
The better rain chances don't arrive until Saturday night, although scattered rain showers will be possible during the day.
"Saturday, we're going to have a chance for showers and storms on and off through the day," Van Cleve said. "It doesn't look like a complete washout but that threat is going to be there.
"We are going to have such a moist air mass in place, it is not going to take much to trip off some storms."
Attention then turns to Saturday night where forecast models, at least for now, show all the ingredients coming together for potentially heavy rain.
"The best (rain) chances will be Saturday night into Sunday morning," the weather service said in a statement. "Heavy rainfall and some flooding are possible during this period."
Weather service forecasters will be monitoring where storms set up during the weekend.
"For the last couple weeks, we've seen repeated rounds of storms, particularly in the south toward the Illinois border," Van Cleve said. "Several counties have been hit multiple times there.
"The higher concern is going to be for those areas that have seen the most rain during the last couple weeks," he added.
Much still depends on when all the ingredients for rain and storms come together. Rain chances are up around 90% for Saturday night in some portions of southern Wisconsin.
"There is still that question mark about how fast this system moves through," Van Cleve said. "It's not real clear-cut timing."
Contact Joe Taschler at (414) 224-2554 or jtaschler@gannett.com. Follow him on Twitter at @JoeTaschler or Facebook at facebook.com/joe.taschler.1.
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