The First Alert Weather Tracker is following the snow falling in Colorado's mountains along the I-70 corridor.

Rain and heavy mountain snow are likely tonight through Wednesday.

The National Weather Service's latest snowfall map puts 12 to 18 inches in the heaviest spots by Saturday morning, and colder than normal air is set to stay into next week.

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Add Yahoo as a preferred source to see more of our stories on Google. The first snow of the season typically happens later in fall for most in the U.S. However, the record earliest snowfalls have ...

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