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The coldest air so far this season is spreading across the U.S.   

Frost and freeze alerts

Frost and freeze alerts (Credit: Fox News)

Morning low temperatures will dip into the teens and 20s from the Northern Rockies to the Great Lakes.  

Below-average temperatures are expected for much of the country this week.

Forecast lows

Forecast lows (Credit: Fox News)

With cold air blowing over the Great Lakes, some lake-effect snow will accumulate.

Forecast snow

Forecast snow (Credit: Fox News)

The West will remain active with rain and mountain snow this week, and rain and storms will pop up along a stationary front draped across the southern Plains.  

Western storms

Western storms (Credit: Fox News)

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Flash flooding could be a problem for southeast Texas on Wednesday.