Snow moved overnight and spread across Maryland during the predawn hours Friday, as the Baltimore area was upgraded to a winter storm warning. Snow totals of 4 to 6 inches are expected.

The snow was affecting the morning commute Friday and triggering delays. Visibility is low because of the falling snow and the fresh coating is creating slick spots and deteriorating road conditions.

A winter storm warning is in effect for Baltimore City and Frederick, Carroll, Howard, Montgomery, Baltimore, Harford, Cecil and Kent counties.

Some Maryland school systems had already announced they’ll operate on a delay or be closed Friday.

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Snow will continue through the morning before tapering off in the late afternoon and evening. It will turn windy and colder Friday evening. Winds will gust out of the northwest at 20-30 mph, creating wind chills in the teens. Any melting that occurs during the day Friday will refreeze, so slick spots are possible into Saturday morning.

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Saturday and Sunday will be very cold. Wind chills will be more of an issue Saturday, with highs in the low to mid-20s and wind chills in the single digits. That’s why we have an alert day in effect for Saturday. If you’re headed to the Ravens’ home playoff game Saturday, dress very warmly.

Lows Saturday and Sunday nights will be well down into the teens.

The warmup begins next week, with highs getting above freezing Monday and temps approaching 50 by midweek. Rain chances make their return by Wednesday, with no chance of wintry weather after Friday anytime soon.

A mix of snow and low visibility illuminates the Domino Sugars sign in South Baltimore in the predawn hours Friday. (Norman Gomlak / The Baltimore Banner)

WJZ is a media partner of The Baltimore Banner.