This animation shows air temperatures at 2 meters above the ground over the north-western hemisphere from January 23 to January 29, 2019. Measurements of temperature, moisture, wind speeds and directions, and other conditions are compiled from NASA satellites and other sources, and then added to the Goddard Earth Observing System (GEOS) model to closely simulate observed reality. Note how some portions of the Arctic are close to the freezing point, significantly warmer than usual for the dark of mid-winter, while masses of cooler air plunge toward the interior of North America.