From NASAJPL https://twitter.com/NASAJPL on Twitter: #PolarVortex as seen by @NASA's Atmospheric Infrared Sounder (AIRS). The Arctic air mass moved southward from central Canada into the U.S. Midwest: https://www.jpl.nasa.gov/news/news.php?feature=7324 #PolarVortex2019 https://twitter.com/NASAJPL/status/1091075318977183744/photo/1 https://chirp.cooleysekula.net/attachment/54185