A strong storm system tracking across the Plains will bring the first accumulating snow of the season for parts of the southern U.S.
There is also a risk of severe storms across the Gulf Coast region with heavy rain, large hail and a few tornadoes.
This system will spread over the South, the Southeast and then up into the Northeast Tuesday and Wednesday as a coastal low.
Arctic air will also spread across the lower 48 this week, delivering below-average temperatures for almost everyone.
Meanwhile, Santa Ana winds return to Southern California on Tuesday.
Winds could gust upward to 70 mph through the canyons and valleys.