A huge expanse of cold, Arctic air is sweeping through parts of Canada and the United States.
Known as a polar vortex, the weather system is expected to deliver record-setting low temperatures and a particularly nasty wind chill.
This visualisation was made from data collected by the Atmospheric Infrared Sounder AIRS instrument onboard NASA s Aqua satellite, and it shows temperature data in the infrared spectrum.
From 1 to 11 December, AIRS tracked the cold snap as it swept across North America.
The cold air continued to make its way from west to east, reaching into the Ohio Valley and New England on 9th December.
These regions are now feeling the brunt of this cold air mass, which is expected to deliver frigid record-setting temperatures this week.