Wisconsin Weather Alert: Saturday Thunderstorms Could Bring Flash Flooding and Slick Roads Across I-41 Corridor

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Green Bay, Wisconsin – Scattered thunderstorms could disrupt weekend plans across northeast Wisconsin as heavy rain and lightning threaten roadways and outdoor events Saturday afternoon.

According to the National Weather Service in Green Bay, a 60% chance of thunderstorms moves in Saturday after 3 p.m., with some storms carrying heavy downpours. Residents in Brown County and along the I-41 corridor should stay alert for fast-changing conditions. Localized flash flooding is possible, especially in areas with poor drainage or ongoing construction zones.

Saturday’s high will hit 84°F, but humidity will push heat index values higher, compounding the discomfort. Winds will remain mild from the south at 3 to 6 mph, but sudden gusts may accompany storms.

Rainfall totals could range from a quarter inch to over half an inch in heavier storms. Overnight, the chance of rain remains high, with temperatures dipping to 66°F and continued thunder possible into Sunday morning.

Conditions stay unstable through Monday, with more showers likely each afternoon and highs in the mid to upper 70s. Travelers should expect possible delays and poor visibility on highways, especially near Green Bay, De Pere, and Allouez. It’s a good weekend to keep devices charged and stay weather-aware.

Storm chances drop Tuesday, with sunshine returning by midweek. Updates from the NWS will follow if watches or warnings are issued.

Five Day Forecast for Green Bay, Wisconsin:

  • Saturday: Showers likely after 3 p.m., high of 84°F. Thunderstorms overnight, low near 66°F.
  • Sunday: 50% chance of storms, high near 74°F. Showers may linger overnight.
  • Monday: Storms possible, high of 78°F. Rain chances at 60%.
  • Tuesday: Partly sunny, lower rain chance. High near 76°F.
  • Wednesday: Mostly sunny and calmer, high of 78°F.