As temperatures fall through the 30s and 20s – slick roads ahead for the Chicago area tonight

Update 7:15PM CST…

The Winter Weather Advisory continues for the entire Chicago area until at least midnight – overnight in northwest Indiana.

A wintry combination of scattered light freezing drizzle and snow flurries is occurring west along the Interstate-39 corridor and the Fox Valley with temperatures dropping through the 20s into the upper teens this Thursday evening – the main threat being spotty slick spots causing by the scattered freezing drizzle/light snow as well as moisture on pavement and cold surfaces freezing due to the sub-freezing temperatures.

Closer-in, rain falling over, south and east of Chicago is very slowly moving northeast, and as temperatures fall into the 30s and 20s, there is an increasing chance of the rain becoming freezing rain and sleet mixed with snow. There could be some snow accumulation and an extended period of slick highways in this area into the early Friday morning hours, as a secondary wave of precipitation is expected to continue.

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Chicago-area roads could become slick in many spots  within the next couple hours, during the evening commute, as a cold front bears down on Chicago. At 4PM CST the north-south-oriented cold front was moving east over the Fox River Valley – along a line from Fox Lake – Crystal Lake – Elgin – St. Charles – Aurora to Morris and south. A huge temperature gradient exists east-west across the frontal boundary with readings in the middle 50s just ahead of the front, dropping into the 30s and 20s not far behind the front. Freezing rain is occurring in Rochelle and Rockford where the temperature at 4PM was 31-degrees at both locations. The 52-degree reading at O’Hare and 60-degrees at Midway will be short-lived – a 25 to 30-degree temperature drop could occur at both locations within the next couple hours.

Maps depicting Chicago Metro weather radar and temperatures are below…