A sharp southward plunge from the polar jet stream in Northern Canada is bringing cold to the U.S. Northeast, with the area expecting to see the coldest air of the winter season this weekend, and dropping the Midwest into subzero cold, according to The Weather Channel.

After averaging temperatures about 5 to 10 degrees above normal for a month, this weekend will bring temperatures that are 10 to 20 degrees lower than is normally expected this time of year, with Saturday, Feb. 13 seeing the coldest lows.

The mid-Atlantic region from southern New York to northern New Jersey and eastern Pennsylvania is expecting to see temperature lows of 0 to -10 degrees, and the Great Lakes area should mimic that. South of the mid-Atlantic and Ohio Vally (down to northern Tennessee and southern Indiana) should see temperatures in the 10 degrees and lower range, reported AccuWeather.

Adding to the already expected lows on Saturday, wind chills are projected to drop around -10 to -15 degrees between Saturday night and Sunday morning. Faye Barthold, a meteorologist with the National Weather Service, said that "Saturday night would be a good night to stay in," per amNewYork.

Friday will bring the cold to the Midwest first, as temperatures will fight to hang above zero. North Dakota, northern Minnesota as well as Wisconsin and the Michigan Upper Peninsula will see the coldest temperatures, according to The Weather Channel.

Saturday will have subzero lows in the Great Lakes area, with the Corn Belt seeing similar drops in warmth. The Ohio Valley is expected to see wind chills well below zero, AccuWeather reported. The corridor from Boston to Washington, D.C., will see highs remain in the teens and low 20s, while the Appalachians and upstate New York may struggle to have above-zero temperatures.

Valentine's Day morning will see below-zeros in New England, stretching south to Philadelphia and west to the Pittsburgh area. The upper Midwest should warm slightly, but temperatures in the single digits and low teens are still expected. By daytime, most areas should see temperatures rise into the teens and 20s again.

According to The Weather Channel's Jonathan Erdman, this cold plunge shouldn't last past the weekend.

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