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Before this weekend's major storm, Anne Arundel and Howard counties could see up to an inch of snow Wednesday night, potentially starting at the tail end of the evening commute.

A winter weather advisory is in effect to the south and southwest of Baltimore from 6 p.m. through midnight, according to the National Weather Service. A disturbance in the upper atmosphere is expected to pass to the south of Baltimore, along with a cold front.

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Given the frigid temperatures over the past few days, expected to be in the 20s Wednesday evening, roads could be snow-covered, the weather service warned.

The system is separate from and smaller than the major storm expected to approach the area Friday, but meteorologists nonetheless urged drivers to be cautious and aware.

A blizzard watch is meanwhile in effect across Central Maryland from Friday afternoon through Saturday night.

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