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Freeze warning in effect as temps set to dip into upper 20s Friday morning: NWS

Permafrost | AP file photo

A freeze warning was issued for Chicago as temperatures were predicted to drop even 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 from 1 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 and northwest Indiana, the weather service said. Earlier, the upcoming cold front was 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.