Arctic air will start to move into the Plains by the start of the workweek pushing temperatures in some areas to more than 30 degrees below average.
Temperatures will be warm in the Central Plains on Sunday, but the colder air will begin to move into the United States from Canada.
Fargo, North Dakota, is expected to be 29 degrees on Sunday. The Northern Rockies, Northern Plains and Upper Midwest will also be in the teens and 20s.
Mild air will remain in places like Casper, Wyoming, Rapid City, South Dakota and St. Paul, Minnesota.
The cold air will extend further south into the Central Plains by Monday.
Fargo will be -2 degrees below zero. Sub-zero temperatures will also extend into parts of South Dakota, like Rapid City.
Temperatures in the teens and 20s will reach further south into the Central Plains.
North Platte, Nebraska, will be around 26 degrees on Monday. Casper will only reach about 17 degrees, and St. Pail will get to around 19 degrees.
Tuesday will be even colder across the region by Tuesday.
Temperatures will be below zero in Fargo and across the Northern Plains. And in the Rockies, temperatures will be in the single digits.
Denver, Colorado, is expected to be around 10 degrees.
Temperatures in the teens and 20s will extend into Oklahoma and the Southern Plains. Colby, Kansas, is only expected to be around 16 degrees on Tuesday.
On Sunday, temperatures will be 20-30 degrees above average in the Central Plains, but there will be a drastic change as the arctic air moves in.
On Monday, temperatures will be 20-30 degrees below average in the Northern Plains, while above-average temperatures will remain in the Southern Plains.
By Tuesday, temperatures will plunge more than 30 degrees below average from the Rockies into the Central and parts of the Southern Plains.