A polar vortex is slated to sweep most of the continental United States bringing a hazardous freeze to millions of Americans from the Deep South to the Northeast Saturday going into next week.

The watch is in effect from Monday evening through Tuesday afternoon. Heavy accumulations of sleet and snow are possible.

Southeast Texas ' outlook for next week's winter storm continues to worsen, with a growing likelihood of a deep freeze and substantial wintry precipitation, snow and sleet in the Houston area.