Most of the United States is being assailed with extreme winter weather this week as Arctic air blasts south from Canada, snow tracks up the Northeast coast and a potentially crippling winter storm takes aim at the South.

A winter storm warning has been issued for the Houston area for the first time in nearly two years as a rare Gulf Coast winter storm promises heavy snow, sleet and freezing rain. The National Weather Service in League City,

The entire Delaware Valley will see snow Sunday, with 3-6 inches expected in Philadelphia. On Monday and Tuesday, temps plummet into the teens and single digits.

On Sunday at 9:36 a.m. an updated winter storm warning was issued by the National Weather Service valid from 10 a.m. until Monday 1 a.m. for Carbon, Monroe and Northampton counties.

New York, New Jersey and Connecticut are bracing for snow, and officials across the Tri-State Area are warning residents to be prepared.

An updated winter storm warning was issued by the National Weather Service on Sunday at 9:18 p.m. in effect until Monday at 1 a.m. for Sussex, Warren, Morris, Hunterdon, Somerset and Mercer counties.