What's Behind the 'Arctic Blast' Plunging into the U.S.?

[Bok]

This week’s cold snap across the U.S. will be one of “the most impressive Arctic outbreaks of this century,” one climate scientist says


More... (https://www.scientificamerican.com/article/whats-behind-the-arctic-blast-plunging-into-the-u-s/)