polar vortex - definition and synonyms

noun
  1.   From our crowdsourced Open Dictionary
    a persistent, large-scale cyclone (=a circular storm) that circles the north and south poles. If it moves from its normal position it can cause significant cooling of the weather in densely populated areas.

    North America’s polar vortex-filled winter was almost certainly overhyped.

    Submitted from United Kingdom on 15/07/2014