Mercury plunges after artic chills sweep America

Mercury plunges after artic chills sweep America

News

An Arctic front plunged into the Washington region of USA, bringing very cold temperatures

Important facts

Cause:

A swirl of arctic air broke away from the polar vortex that usually encircles the North Pole and moved south towards America

Polar Vortex:

1. The polar vortex is a large area of low pressure and cold air surrounding both of the Earth’s poles. It always exists near the poles, but weakens in summer and strengthens in winter.
2. The term “vortex” refers to the counter-clockwise flow of air that helps keep the colder air near the Poles.
3. Often during winter in the Northern Hemisphere, the polar vortex will become less stable and expand, sending cold Arctic air southward over the United States