Arctic air has driven down temperatures in most of the continental US. A new video animation from NOAA shows the arctic air swirling into the country and predicts its path.
If you live anywhere within the northern two-thirds of the United States, you've probably noticed that it's pretty chilly outside. The plunge in temperatures over the past few days comes courtesy of an invasion of Arctic air that has been captured in a mesmerizing new animation from the National Oceanic and Atmospheric Administration.
The animation, made with weather data from the NOAA/NCEP Real-Time Mesoscale Analysis, begins on Saturday (Jan. 19) with very cold air seen only over the Rockies, Montana, North Dakota, the northern half of Minnesota and the northern portions of New England. Much of the eastern and central parts of the country saw weekend weather that was balmier than usual for mid-January.