NASA's AIRS captures polar vortex moving in over U.S. – Climate Change: Vital Signs of the Planet

NASA's AIRS captures polar vortex moving in over U.S. – Climate Change: Vital Signs of the Planet: NASA's Atmospheric Infrared Sounder (AIRS) instrument captured the polar vortex as it moved southward from central Canada into the U.S. Midwest from January 20 to January 29.