polar vortex 極地渦旋

polar vortex
繁：極地渦旋
简：极地涡旋

北極地帶酷寒氣流從原本封閉的「極地渦旋」（polar vortex）氣層竄出，往南一路長驅直入，來到美國中部以及東南部，以往都是暖冬的部分地區，頓時化身冰天雪地。科學家指出，這種狀況近幾年來發生次數，已經變得越來越頻繁。

氣候變遷 極地渦旋再也關不住…（2018年1月5日），聯合新聞網，取自 https://udn.com/news/story/11314/2913321

Crews are working to restore power across Atlantic Canada while a polar vortex descends on the region still recovering after a massive storm brought hurricane-force winds.

Crews work to restore East Coast power as polar vortex arrives. (2018, January 5). CBC News. Retrieved from http://www.cbc.ca/news/canada/nova-scotia/power-outage-weather-bomb-second-day-1.4474233