Millions of residents across multiple states in the U.S. have been warned to brace for a possible bomb cyclone, forecast to hit from Monday, December 29, through to the weekend, bringing heavy winds and wintry conditions, prompting the National Weather Service (NWS) to issue storm warnings and advise drivers not to travel unless it’s an emergency.

The entire state of Michigan is under a warning, advisory or alert related to the weather, with Metro Detroit under a high wind warning.

A winter storm moving into Wisconsin is bringing fog, rain, snow and rapidly dropping temperatures. Here's the timing and forecast.

An updated winter weather advisory was released by the National Weather Service on Saturday at 2:11 a.m. in effect until 10 a.m. for Sussex, Warren, Morris, Hunterdon, Somerset and Middlesex counties.

Millions of Americans live in areas under winter storm alerts stretching from northern Minnesota to the Eastern Seaboard.

On Thursday at 12:42 p.m. a winter weather advisory was released by the National Weather Service valid for Friday between 8 a.m. and 3 p.m. for Beaver, Allegheny and Washington counties.

A major atmospheric river storm walloping the state with heavy rains, strong winds and major snow is making its way to Southern California, bringing what forecasters say is likely become the region's worst Christmas storm in recent memory.

The National Weather Service said two more impulses will move through the area with the potential for flooding in the burn scar areas.