The culprit is a familiar one: the polar vortex.
Published Jan 29, 2019
It was cold across the eastern part of North America, but the opposite was true in other parts of the world.
Published Dec 6, 2018
Blasts of Arctic air spilling into the Midwest and Northeast are poised to make New Year’s Eve frigid for many Americans.
Published Dec 29, 2017
NASA’s Aura satellite observes nitrogen dioxide hovering over many cities in the region, trapped by winter weather conditions.
Published Jan 18, 2013
Vortex wind patterns swirling over sea ice in the Bering Sea in mid-January 2006 have created stunning cloud street patterns.
Published Jan 25, 2006
This color-coded map shows temperature anomalies for the United States, Canada, eastern Siberia, and Greenland for January 9 to 16, 2011.
Published Jan 26, 2011
Valentine’s Day didn't warm a lot of hearts in the eastern United States.
Published Feb 16, 2016
In late April 2006, a spring snow storm hammered the northern Plains of the midwestern United States.
Published Apr 20, 2006
In March 2013, the same meteorological phenomenon brought warm weather to the Arctic and cool air spilling into the North America, Europe, and Asia.
Published Apr 3, 2013
Large waves in the atmosphere mean that a cold snap in one area is often accompanied by unusual warmth in another.
Published Jan 3, 2018
Water vapor reveals the invisible drivers that are bringing snow, ice, and rain to much of the United States over the holiday travel period.
Published Nov 27, 2013
While North Americans contended with a blast of Arctic air, Europeans found themselves wondering where winter went.
Published Jan 10, 2014
A convoluted jet stream plunged Europe into a severe cold snap in late January and early February 2012.
Published Feb 10, 2012
Much of the Northern Hemisphere experienced cold land surface temperatures in December 2009, but the Arctic was exceptionally warm.
Published Jan 9, 2010
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