An extremely cold air mass that originates in Siberia and travels to another country, especially the United States. A play on the name of the rail line. Primarily heard in US. We've been having an unusually warm November, but the temperature is expected to plummet next week once the Siberian Express hits.The entire region has been blasted with cold air by the Siberian Express, with temperatures dipping as low as -10 degrees Fahrenheit.
Siberian express
n. an enormous mass of very cold air moving from Siberia, across the North Pole, and down onto North America. The country braced itself for a return Friday of the Siberian express with temperatures dropping to twenty below in many areas.