Winter weather advisories or winter storm warnings were in place for seven states early Tuesday morning, with the National Weather Service forecasting up to 12 inches of snow for some parts of the country. Winter storms can cause power outages, while snow can interfere with travel and create dangerous driving conditions.

The National Weather Service warns that a “potent winter storm system will bring a multi-faceted threat for significant weather hazards” to all Hawaiian islands starting Wednesday night.

A winter storm expected to hit southern Colorado on Wednesday could drop more than a foot of snow in the mountains and up to six inches in the southern metro area.

The new weather system could bring misery for travelers as it serves up ice, rain, and snow to millions of Americans in Southern states.

A winter storm watch was issued by the National Weather Service on Tuesday at 3:54 a.m. valid from 7 p.m. until Wednesday 6 p.m. for Oneida County.

More than a foot of snow is expected through early Thursday in parts of central New York, while other parts of of western and central New York will see several inches of snow, according to the National Weather Service in Buffalo.

An unusually strong low-pressure system will pass north of the state Wednesday night, bringing the threat of heavy rain, damaging winds, and thunderstorms.

The National Weather Service issued a winter storm warning for Hamilton, Fulton, and Herkimer Counties from 7 p.m. Tuesday evening to 1 a.m. Thursday.

HONOLULU (HawaiiNewsNow) - Several severe weather alerts will be taking effect as a strong winter storms system approaches Hawaii. The National Weather Service says a Flood Watch will be in effect for all main Hawaiian islands from Wednesday evening through Friday morning.

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

The nation's capital is expected to see mostly sunny skies with increasing winds over the next few days; gusts may hit 47 mph on January 29.

The National Weather Service issued a winter weather advisory at 3:01 p.m. EST on Monday valid from Tuesday 7 a.m. EST until Wednesday 7 a.m. EST for Alger, Luce and Schoolcraft counties.