CHICAGO (AP) — Storm sweeping across northern Illinois prompted a tornado warning and forced the cancellation of hundreds of flights at Chicago’s airports.

The National Weather Service issued a flash flood watch for north central and northeast Illinois as thunderstorms are forecast to cross the area through Monday evening. Forecasters say the storms are expected to dump up to two inches of rain per hour at times.

The weather service issued a brief tornado warning for Chicago’s western suburbs. Warning sirens prompted downtown Chicago office buildings to warn tenants to shelter in hallways away from windows. There are no immediate reports of injuries or damage.

The Chicago Department of Aviation is reporting delays of up 30 minutes at O’Hare International Airport, where more than 430 flights were cancelled. Delays of 35 minutes and the cancellation of 25 flights are reported at Midway International Airport.

 

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