The eggheads who track weather for the federal government have released what Our Amazing Planet calls a "mesmerizing" new animation video (below) that shows the Arctic cold front that brought some of the coldest weather in the last few years to Minnesota this week.
The National Oceanic and Atmospheric Administration video starts with Saturday and shows a spread of icy blue (where it is below freezing) bleeding across much of the country through the week. The video was created by the weather-pattern video wizards in NOAA's Environmental Visualizations Laboratory. They conclude, "The pattern is clear: much of the U.S. is pretty cold."
Check it out: