Polar vortex brings coldest air in a generation

今日の英語の習慣化の題材は、今アメリカ中西部を襲っている極寒波の話題です。

北極よりも寒いと言うことで、Polar Vortexと言う単語を使ってますね〜

Arctic-cold temperatures blasted the Midwest today. Here's what it looked like.
A deep freeze swept over the Midwest and parts of the Northeast today.

The frigid cold temperatures forced road, school and state office closures. Mail and train services were also suspended in some states.

In Chicago, officials set railroad tracks on fire because the extreme cold could cause defects.

This is what it looked across the rest of the Midwest today: