Vigilance and preparation are important, say forecasters at the NWS, as wintry weather brings hazardous travel conditions.

A strong polar vortex is expected to keep cold air in Canada and the northwest U.S. in February, March and April, according to Weather Channel.

The National Weather Service has simplified some of its winter weather alerts for Wind Chill and Extreme Cold Warnings.

Here are the definitions of the alerts, and what you should know to stay safe when winter weather strikes. Winter Storm ...

Beaufort County, Hilton Head hit by winter storm. Residents woke up to several inches of snow and now face cold temps in ...

The historic Winter Storm brought the first Blizzard warnings along coastal Louisiana, and once-in-a-lifetime snowfall totals to the South. Roads and schools in some parts of the Gulf Coast remain ...

Follow NBC News live updates for the latest coverage of the freezing winter weather affecting large swaths of the U.S., from ...

PENNSYLVANIA, USA — The FOX43 Weather Team has issued a Weather Impact Alert through Thursday morning for bitterly cold and ...

A winter storm pummeled the southern United States with ice and snow Tuesday. Here's how much snow fell in Florida, Texas, ...

Winter is now in full swing after a winter storm blew through Maine's coastline Sunday night into Monday. The winter storm ...

The heaviest snowfall in the Sunshine State occurred around Pensacola, where spotters reported measuring amounts of 5-12 ...