the Great Siberian Express

The Great Siberian Express refers to an intense and rapid cold air outbreak originating from Siberia that moves over North America, especially during winter. This surge of frigid air causes a significant drop in temperatures across large parts of the continent. It occurs when high-pressure systems over Siberia push extremely cold Arctic air southward through the jet stream, leading to sudden and extreme cold snaps in affected regions. This phenomenon is notable for its strength and speed, often leading to bitter cold weather conditions over North America in a short period.