Up to 2 inches of rain had already fallen as of 9:30 p.m. Monday, and another 1 to 2 inches was possible, triggering the flash flooding, the National Weather Service said.
The last strong El Niño was in the 1997-98 winter, when the Chicago region experienced an unusually warm winter, with some temperatures hitting the high-50s.
Gov. Bruce Rauner confirmed two people have died in the tiny hamlet of Fairdale, Illinois, after a massive “wedge” tornado virtually destroyed the town.
Less than a tenth of an inch of ice will accumulate overnight, but that’s still enough to leave untreated roads and walkways slippery. Drivers should slow down and take extra precautions.
The National Weather Service has issued a dense fog warning for Lake and Cook Counties Friday evening.