The National Weather Service issued a flash flood warning on Saturday afternoon for parts of the metro-east, including northwestern St. Clair County and Madison County.
The warning is in effect until 10:30 p.m. Saturday.
Between 2 and 3 inches of rain had already fallen in the warned area as of 2:41 p.m. Saturday and an additional 3 to 5 inches of rain may fall in the area.
“Life-threatening” flash flooding could develop quickly Saturday night, according to a weather service bulletin.
The weather service pointed out the following Illinois highways that could cause problems:
▪ Interstate 70 between exits 21 and 24.
▪ Interstate 55 between exits 23 and 63.
▪ Interstate 64 near exit 9.
Meanwhile, a flash flood watch remains into effect until 6 p.m. Monday.
By Wednesday, there is a slight chance of snow. The New Year’s Eve and New Year’s Day weather will be dry but chilly, according to the National Weather Service.