Major changes in weather patterns are about to cause drastic changes in temperatures across the United States.

(CNN) — Are you sick? Mother Nature has word: Weather patterns will change dramatically next week, and the cold will be over.

Few places in the continental United States escaped the cold over the past week. Wind chills dropped below -40 degrees Celsius in parts of the central United States, hundreds of temperature records were broken, one of the coldest NFL games on record took place, and the coldest caucuses in the country took place in Iowa.

But by next week, freezing temperatures across the continental U.S. will be a distant memory, with unseasonably mild weather ending the cold. In some places, it feels more like March than January.

Temperatures in the lower 48 states are expected to be above average starting Tuesday, according to the Climate Prediction Center’s temperature forecast.

This change would be caused by significant changes in weather patterns in the upper atmosphere through which the jet stream flows.

During the current cold pattern, the jet stream—a river of air that acts as a separator between warm and cold air—is moving across the southern United States. This positioning allows cold air to leave the Arctic and move across Canada and deep into the United States.

But the jet stream will move further north next week. This will do two things at once: trap very cold air in Canada and allow warm air from the tropics to rise north into the United States.

Temperatures below zero in New York on January 17, 2024 (Photo: Selcuk Acar/Anadolu via Getty Images)

The warming trend will begin Sunday across parts of the western and north-central United States. Early next week, the scope and intensity of the mild weather will gradually expand across more parts of the country.

Chicago may finally break the ice on Monday. This may be the first time the temperature in the city has breached the zero-degree mark since Saturday afternoon.

But the most dramatic weekly temperature changes will occur midweek across the central and eastern United States.

Temperatures in parts of the Plains and Midwest will go from 30 to 40 degrees below average on Sunday to 10 to 20 degrees above average on Wednesday.

Des Moines, Iowa, and Minneapolis will both experience temperature swings in the 40s and 50s, from freezing temperatures this week to unseasonably warm weather next week.

The high temperature in Des Moines did not exceed -21.6 degrees Celsius on Sunday. The maximum temperature next Wednesday is expected to be about -1.1 degrees Celsius, more similar to March. Minneapolis only hit -16.1 degrees Celsius on Sunday, but will hit a spring high of around 4.4 degrees next Wednesday.

Further east, it feels more like late February. Indianapolis, Cleveland, Philadelphia and New York City will see high temperatures of 4.4 degrees Celsius midweek.

These above-average temperatures are likely to continue into late January across much of the country, according to the Climate Prediction Center.

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