Polar vortex. 極地渦旋

Lake Michigan FREEZES OVER, football fans shiver in minus 19F and JFK closes for hours as extreme cold as America shivers through 'polar vortex' | Mail Online  http://www.dailymail.co.uk/news/article-2534097/Lake-Michigan-FREEZES-OVER-football-fans-shiver-minus-19F-JFK-closes-hours-extreme-cold-America-shivers-polar-vortex.html

NATI HARNIK / AP
Sunlight streams through the windows of a building which caught on fire in Plattsmouth, Neb.
Historic freeze could break Midwest temp records | Toronto Star  http://www.thestar.com/news/world/2014/01/04/historic_freeze_could_break_midwest_temp_records.html

Jenny Hackett walks across a street in St. Louis as snow and wind swirls around Sunday, Jan. 5, 2014.. Heavy snow continues to fall Sunday with forecasters calling for up to a foot (30 centimeters) in eastern Missouri and parts of central Illinois followed by bitter cold. (AP Photo/Jeff Roberson)
'Polar vortex' pushes subzero temps into Midwest | www.krmg.com    http://www.krmg.com/ap/ap/top-news/polar-vortex-pushes-subzero-temps-into-midwest/p4gFj/

AP
Observer-Reporter | Historic freeze could break Midwest temp records  http://www.observer-reporter.com/article/20140104/NEWS05/140109737#.Usp0ltIW2aQ

AP
11 Photos and Videos Showing Just How Damn Cold It is - PolicyMic  http://www.policymic.com/articles/78165/11-photos-and-videos-showing-just-how-damn-cold-it-is

This Is The Clearest Picture Of How Arctic Temperatures Are Spreading To America | Business Insider
http://www.businessinsider.com.au/arctic-temperatures-pictures-2014-1

Polar vortex - Wikipedia, the free encyclopedia  http://en.wikipedia.org/wiki/Polar_vortex
極地渦旋 - 維基百科，自由的百科全書  http://zh.wikipedia.org/wiki/%E6%9E%81%E5%9C%B0%E6%B6%A1%E6%97%8B

美國氣象部門提供的北極強冷渦旋示意圖
「極地渦旋」造成北美東岸大雪嚴寒 - BBC中文網 - 國際
http://www.bbc.co.uk/zhongwen/trad/world/2014/01/140105_northamerica_poloar_vortex.shtml

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