By Mary Kay Kleist

CHICAGO (CBS) — Persistent lake effect snow late Thursday prompted a Winter Weather Advisory that will go into the overnight hours for Lake and northern Cook counties.

Thursday 11 p.m.: 02.11.21

(Credit: CBS 2)

As snow showers continue, the National Weather Service said the advisory will be in effect until 4 a.m. A broader advisory for the rest of Cook County and DuPage County has been dropped.

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Meanwhile, a system of snow from the west is crossing northern Illinois. This all tapers off by daybreak.

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On Friday morning, the wind chills drop to 15 below. It will be dry and mostly cloudy during the day with a high of 16.

Feels-Like Tracker: 02.11.21

(Credit: CBS 2)

Another round of steady snow Friday night through Saturday evening could bring another 2 to 5 inches this weekend.

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Next 2 Days: 02.11.21

(Credit: CBS 2)

Snowfall Tracker: 02.11.21

(Credit: CBS 2)

A reinforcing shot of Polar air moves in for Valentine’s Day, when temperatures will fall below zero overnight, and reach highs around only 5.

Valentine's Day Forecast: 02.11.21

(Credit: CBS 2)

Mary Kay Kleist