A freeze warning was issued forChicago as temperatures were predictedto dropeven lower than expected for the arrival of fall.
Friday morning could see temperatures dip to the upper 20s and lower 30s, according to the National Weather Service. The warning is in effect from1 a.m. to 9 a.m., although freezing temperatures could possibly return in the evening as well.
The areas affected include Chicago, the north and west suburbs andnorthwest Indiana, the weather service said.Earlier,the upcomingcold frontwas only expected to dip to the high 40s.
Due to a frost advisory, owners of sensitive outdoor plants were asked to move the vegetation inside or cover it, the NWS said.