Category: Polar Vortex

WATCH: NASA’s Atmospheric Infrared Sounder Captures Polar Vortex Moving in Over U.S.

The U.S. Midwest has been gripped by the lowest temperatures it has seen in years. An unusually cold Arctic air mass, called a polar vortex, is responsible for the severe temperatures, which in many areas have plunged well below 0 degrees Fahrenheit (-18 degrees Celsius).