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Following localized severe storms to end the week, volatile weather will threaten parts of the central and northern Plains and the Upper Midwest into Saturday evening.
Storms will erupt along the leading edge of advancing chilly air from the northern Rockies.
"As the storms advance eastward and re-fire into Saturday night, they may bring the full spectrum of severe weather including large hail, high winds and flash flooding," AccuWeather Lead Storm Warning Meteorologist Eddie Walker said.
An isolated tornado or two cannot be ruled out.
The storms into Saturday evening will extend from eastern Minnesota and northwestern Wisconsin to eastern Nebraska, western and central Iowa to northeastern Kansas and northwestern Missouri.
Locally severe thunderstorms will also ignite southward toward the Oklahoma border.
Later Saturday night, storms may still pack a punch from part of the Upper Peninsula of Michigan to central Wisconsin and eastern Iowa.
In addition to affecting ground and air travel in the region, the storms may pose a risk to high school and college football games.
Motorists and anyone spending time outdoors should keep alert for changing weather conditions. Sudden, torrential downpours can lead to a rapid decrease in visibility and excess water on the roads. The greatest risk for people outdoors will be from lightning strikes.
Major cities that may be affected by the storms include Omaha, Nebraska; Minneapolis and Rochester, Minnesota; Des Moines, Iowa; Topeka, Kansas; Kansas City, Missouri; and Eau Claire and La Crosse, Wisconsin.
Locally heavy, gusty thunderstorms may affect areas from the central Great Lakes to the middle Mississippi and Ohio valleys later this weekend into early next week.
The storms will mark an end to the late summer heat. However, warmth will quickly rebound and set the stage for more severe thunderstorms to erupt on Tuesday.
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