We are tracking one heck of a storm system affecting tens of millions of people across the country.

A map of coast-to-coast storms

Storms across both U.S. coasts (Credit: Fox News)

The system will bring heavy snow, ice, and blizzard conditions, as well as severe weather including tornadoes and heavy rain that could bring flash flooding.  

A map of winter weather alerts

Winter weather alerts in the Midwest, Plains through Thursday morning (Credit: Fox News)

Heavy snow will spread from the Rockies through the Plains and up into the Great Lakes and Midwest.  

A map of the ice forecast

The ice forecast on Thursday and Friday in the Northeast (Credit: Fox News)

Accumulating ice has prompted ice storm warnings for parts of the northern Plains through the upper Midwest.

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Meanwhile, strong-to-severe storms are setting up from Texas across the Mississippi Valley and into the Southeast.  

A map of Gulf Coast severe storm threats

A severe storm threat on Tuesday for the Gulf Coast (Credit: Fox News)

A coastal low will also develop Thursday and Friday, bringing heavy snow to the interior Northeast and the mid-Atlantic, along with dangerous ice.  

A map of Southeast severe weather

A severe storm threat on Wednesday for the Southeast (Credit: Fox News)

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Please pay close attention to your local forecast details, and Fox Weather is also working hard to keep you safe.