is a shorthand meteorological term in the United States describing the arrival of an extremely cold air mass
origins. It does not necessarily refer to an origin in Siberia
. The term is most commonly employed by the news media when such a frigid air mass moves into areas where it is relatively unusual, such as the Deep South or Eastern Seaboard of the United States. Meteorologically, it is typically associated with a phenomenon called the Pacific-North American teleconnection pattern
It is also the nickname of Alexei Cherepanov, a russian hockey player.