Storm Nancy warning as millions of Americans to be hit by a polar plunge TOMORROW in 48 hour big chill

MILLIONS of Americans will be hit by polar plunge temperatures tomorrow, in a 48-hour freeze brought on by winter storm Nancy.

On Monday temperatures will be 10 to 20 degrees below average over the upper midwest and northeast, according to the Weather Prediction Center.

The National Weather Service issued alerts along the path of winter storm Nancy, which goes from parts of Montana and Wyoming to the Great Lakes and far northern New England.

By Tuesday and Wednesday, temperatures are expected to drop to 30 to 40 degrees below normal in just 48 hours.

After a warm weekend, Denver will see its temperature drop down to 15 and snow showers for the peak on Tuesday.

The temperature is expected to drop to zero on Tuesday in Rapid City in South Dakota.

In places such as Amarillo, Texas, temperatures will drop even faster – in just 24 hours.

The city saw weather in the low 70s on Monday but the temperature will drop to the mid-30s by Tuesday.

In Wichita, Kansas, temperatures will go from a high near 70 on Monday to the mid-20s on Tuesday.

More than 15 million are expected to experience temperatures below freezing. 

Winter storm Nancy is currently spreading snow from the Northern Rockies into the Northern Plains and upper Midwest, as reported by the .

At least six inches of snow are expected in parts of the Dakotas, Minnesota, Wisconsin, Michigan and Maine.

“This includes the Twin Cities, where this longer-lived snowfall could lead to hazardous morning and afternoon commutes Monday and Tuesday,” reads the Weather Channel warning.

“Some accumulations of freezing rain and/or sleet are also possible in parts of northern Iowa into southern Wisconsin, far northern Illinois, northern Lower Michigan and far northern New England.”

Following storm Nancy, winter storm Oaklee is expected to make landfall in the Southwest on Tuesday before moving across the central US.