It might seem counterintuitive, but the dreaded polar vortex is bringing its icy grip to parts of the U.S. thanks to a sudden blast of warm air in the Arctic.

Science Says: Get Used to Polar Vortex Outbreaks https://www.voanews.com/a/science-says-get-used-to-polar-vortex-outbreaks/4763045.html

Q&A: How is Arctic warming linked to the ‘polar vortex’ and other extreme weather? https://www.carbonbrief.org/qa-how-is-arctic-warming-linked-to-polar-vortext-other-extreme-weather