NWS 7-13-18 afternoon

A large area of thunderstorms in Iowa and Minnesota is moving toward southern Wisconsin Friday afternoon, bringing the chance for severe weather.

The National Weather Service said thunderstorms are likely in all of the region but there's a marginal risk for severe storms east of a line from Janesville to Waukesha to Port Washington.

The primary threats are damaging winds and flash flooding.

Heat index values are also going up and could reach the upper 90s

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The day-to-day outlook:

  • Friday night: An 80 percent chance of showers and thunderstorms, low around 70. Up to an inch of rain is possible.
  • Saturday: A 60 percent chance of showers and thunderstorms, high near 81. Up to a quarter-inch of rain is possible, more in storms.
  • Saturday night: A 10 percent chance of showers and thunderstorms, low around 68.
  • Sunday: A 30 percent chance of showers and thunderstorms, high near 85.
  • Sunday night: A 20 percent chance of showers and thunderstorms, low around 68.
  • Monday: A 30 percent chance of showers and thunderstorms, high near 82.
  • Monday night: Mostly clear, low around 61.
  • Tuesday: Sunny, high near 78.
  • Tuesday night: Mostly clear, low around 59.
  • Wednesday: Mostly sunny, high near 77.
  • Wednesday night: A 30 percent chance of showers and thunderstorms, low around 62.
  • Thursday: A 40 percent chance of showers and thunderstorms, high near 77.
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Bill Novak is a general assignment reporter for the Wisconsin State Journal.