An Arctic blast has brought snow, frost and dangerously cold winds to the northern Plains, Midwest and Great Lakes, creating “very difficult to impossible” travel conditions on one of the busiest days of the year,

An arctic blast of severe cold and snow is creating hazardous conditions across the Great Lakes region over the next two days, according to the US Weather Prediction Center, potentially disrupting the plans of millions traveling the roads and skies.

An Arctic blast brought snow, frost and dangerously cold winds to the northern Plains, Midwest and Great Lakes, creating difficult travel conditions on one of the busiest travel days of the year, as millions of Americans head home from their Thanksgiving destinations.

The United States faces extreme winter conditions as heavy snowfall and freezing temperatures impact several regions. While snowmobilers and skiers enjoy the wintry weather, authorities warn of dangerous travel conditions.

An Arctic blast of cold air is expected to hit much of the U.S. into next week, sending temperatures plummeting. More than 230 million Americans are being impacted by the “dangerously cold” weather following a snowy and rainy Thanksgiving Day, according to FOX Weather.

Some parts of the country will receive heavy lake-effect snow and others will see rain or dry weather with subfreezing temperatures.

Don’t forget to check the local forecast before you hit the road: Snowfall could snarl post-Thanksgiving travel plans across the northern Plains and Midwest, while roughly 9 million people are under freeze warnings in the South.