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

Storm Warning was issued for York and Adams County for Sunday by the National Weather Service in State College, with a snowstorm expected.

The particularly dangerous situation alert is relatively new to Southern California but has been issued before the recent wildfires that have caused devastation across LA County.

A winter storm watch will be in effect Sunday for much of eastern Pennsylvania, including the Poconos. In Carbon and Monroe counties, 6 to 10 inches of snow is possible, the National Weather Service said Friday afternoon when issuing the watch. For Pike and Wayne counties, 5 to 9 inches is possible, the NWS said.

Motorists should be prepared for slippery roads and rapid changes in visibility and road conditions due to lake effect snow, the weather service said.

STATEN ISLAND, N.Y. -- The National Weather Service has issued a winter weather advisory for New York City, effective from 1 p.m. on Sunday, Jan. 19, until 4 a.m. on Monday, Jan. 20.

The wind chill in Columbus dropped as low as -5 degrees overnight, and as of 6 a.m. the air temperature was 5 degrees with a -3 degree wind chill

During this advisory, snow accumulations between three and six inches are possible. In Cuyahoga County, the greatest accumulations will be across the eastern half of the county.

Particularly Dangerous Situation: What is it and when are they issued by the National Weather Service

The Marquette NWS office said wind chills in some areas could reach 44 below zero early in the week and residents should prepare.

As temperatures plummet and wind gusts intensify, the National Weather Service (NWS) is rolling out changes to its cold weather alerts as part of its Hazard Si

The National Weather Service and European global models show increasing chances of snow in Florida on Monday and Tuesday night.