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N.D. (AP) – A surge of arctic air is bringing dangerously cold temperatures to the Dakotas, but the cold snap isn’t expected to last long.

The National Weather Service has posted wind chill advisories and warnings throughout the two states, with wind chills in the next couple of days expected to drop to as low as 55 degrees below zero in some areas. Wind chill is a measure of air temperature and wind.

Forecasters say prolonged exposure to such extreme cold can lead to frostbite and hypothermia, and can be deadly.

The weather is expected to warm by the weekend, with daytime high temperatures Saturday and Sunday reaching into the 30s and 40s in some areas, and even into the upper 50s in southwest South Dakota.