A polar vortex is slated to sweep most of the continental US bringing winter storm warnings and a hazardous freeze to millions.

Some snowflakes were still falling as of around 6:45 a.m. Monday, but National Weather Service forecasters expect the precipitation to stop by daybreak. Snow totals during the storm ranged from 8 inches in Ashfield to less than an inch in most of Barnstable County.

Snowfall forecasts have increased for a winter storm expected to blanket New Jersey with widespread areas of 4 to 8 inches of snow. Winter storm warning areas were expanded early Sunday and a state of emergency is in effect. National Weather Service and AccuWeather