A storm system will move across the central Plains into the Great Lakes through Friday and will bring a round of heavy rain and severe thunderstorms.
This storm system will also bring a soaking rain to parts of the Dakotas and Nebraska through Friday afternoon.
According to AccuWeather Meteorologist Josh Searles, "Thunderstorms will bring localized flash flooding and damaging wind gusts from central Illinois to northeast Oklahoma."
"An isolated tornado threat will exist across northern Missouri and southern Iowa late Friday afternoon into Friday evening as a surface low passes through, generating the potential for rotating thunderstorms," he added.
"The main threat farther north across the Great Lakes region will be flash flooding, as storms in this area will have ample atmospheric moisture to feed off of," Searles said.
Cities at risk for severe thunderstorms into Friday night include Wichita and Topeka, Kansas; Kansas City and Columbia, Missouri; and Quincy and Peoria, Illinois.
Travel could become dangerous at times across interstates 29, 35, 70 and 80.
A break from any precipitation will occur across Chicago after any leftover shower or thunderstorm rolls through early Friday morning. There may be a couple peeks of sun during the afternoon before thunderstorms develop during the late afternoon.
Those heading to the baseball game between the Chicago Cubs and the St. Louis Cardinals at Wrigley Field on Friday afternoon might survive the entire game rain-free. Thunderstorms, however, could move in as fans head home.
The second round of the PGA's BMW Championship in Lake Forest, Illinois, should be free of rain for most of the round. Any lingering thunderstorms during the early morning or late afternoon could suspend play until conditions are safe to return to action.
The area of severe thunderstorms will weaken as they approach Chicago Friday night. The main threat during the overnight will be heavy rainfall capable of localized flash flooding. Those attending any local high school football games Friday night should bring along the rain gear and umbrellas.
Use AccuWeather Minutecast® for a minute-by-minute precipitation forecast for your area by entering your street address. Mobile users can use their GPS location.
Drivers should be alert for any ponding of water on roadways and slow down to reduce the risk of hydroplaning.
Conditions will dry out on Saturday as an area of high pressure builds into the Plains and Upper Midwest. Cooler air will build in for the weekend despite plenty of sunshine.
Temperatures across the region will be more typical of early October than the middle of September.
Conditions will be favorable for anyone heading to any college football or baseball games on Saturday.
As the storm system advances northeastward, showers and thunderstorms will develop from eastern Ohio into parts of Tennessee and Arkansas on Saturday.
Thunderstorms can lead to delays for local college football games on Saturday, including the game in Columbus, Ohio, as #1 Ohio State hosts Northern Illinois.
Cleveland and Detroit will dry out in time for their Saturday night baseball games.
Thunderstorms are not expected to be as severe as those on Friday. Any thunderstorm does have the potential to produce heavy rain and gusty winds.