Siberian Express

Siberian Express is a shorthand meteorological term in the United States describing the arrival of an extremely cold air mass of Arctic 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 (PNA).

Siberian Express in Supervolcano
Several years after the Yellowstone Supervolcano erupted, the weather in the United States and Canada continued to be much colder than before especially when a Siberian Express would hit. Bryce Miller was watching the Weather Channel when it warned of one such massive cold front approaching Wayne. It had already "severely impacted" Canada with Edmonton hitting a low of minus sixty-eight, Saskatoon a high of minus thirty-one and Winnipeg a low of minus fifty-six.