The culprit is a familiar one: the polar vortex.
Image of the Day Atmosphere Severe Storms
It was cold across the eastern part of North America, but the opposite was true in other parts of the world.
Image of the Day Remote Sensing
Blasts of Arctic air spilling into the Midwest and Northeast are poised to make New Year’s Eve frigid for many Americans.
Image of the Day Atmosphere Temperature Extremes
NASA’s Aura satellite observes nitrogen dioxide hovering over many cities in the region, trapped by winter weather conditions.
Image of the Day Atmosphere
Vortex wind patterns swirling over sea ice in the Bering Sea in mid-January 2006 have created stunning cloud street patterns.
Water Unique Imagery Snow and Ice
This color-coded map shows temperature anomalies for the United States, Canada, eastern Siberia, and Greenland for January 9 to 16, 2011.
Image of the Day Heat Land
Valentine’s Day didn't warm a lot of hearts in the eastern United States.
Atmosphere Heat Land Snow and Ice Temperature Extremes
In late April 2006, a spring snow storm hammered the northern Plains of the midwestern United States.
Severe Storms Snow and Ice
In March 2013, the same meteorological phenomenon brought warm weather to the Arctic and cool air spilling into the North America, Europe, and Asia.
Image of the Day Atmosphere Heat
Large waves in the atmosphere mean that a cold snap in one area is often accompanied by unusual warmth in another.
Image of the Day Heat Land Temperature Extremes
Water vapor reveals the invisible drivers that are bringing snow, ice, and rain to much of the United States over the holiday travel period.
While North Americans contended with a blast of Arctic air, Europeans found themselves wondering where winter went.
Image of the Day Land
A convoluted jet stream plunged Europe into a severe cold snap in late January and early February 2012.
Image of the Day Atmosphere Water
Much of the Northern Hemisphere experienced cold land surface temperatures in December 2009, but the Arctic was exceptionally warm.
Image of the Day Atmosphere Heat Land