Air temperature ⭠ Warmer air Colder air ⭢ Freezing +80°F +60°F +40°F +20°F 0 -20°F Source: NOAA's National Centers for Environmental Prediction Note: The map depicts air temperatures two meters above ground.
It shows a detailed simulation of air temperatures that was created by blending high-resolution weather forecast models with recent observations from satellites and over 30,000 weather stations.
The polar vortex spins in a counter-clockwise direction, creating the path of cold air that traveled south, then east, and finally north again.
It became “pretty breezy” as the freezing air shifted east, said Caleb Grunzke, a meteorologist with the National Weather Service’s office in Chanhassen, Minn.
As the cold air traveled down the central part of the country, its path was deflected by the Rocky Mountains.