According to the National Weather Service, a polar vortex will impact most of the country this weekend, here is what you need to know.

Nearly 300M Americans face an arctic blast with sub-zero wind chills, heavy snow, and record-low temperatures ahead

However, a deep freeze, thanks to the polar vortex dipping down from Siberia, is about to bring even harsher, frigid temperatures to nearly 300 million Americans starting this weekend.The polar vortex is a large area of cold air and low pressure that normally spins over the North and South Poles.