Some scientists believe that warmer-than-average conditions in the Arctic can weaken the polar vortex, so causing colder-than-average conditions at lower latitudes. They think this could help to explain the extreme conditions of the 2009-2010 winter when the normal pattern of Arctic winds broke down causing a weakened polar vortex to allow a frigid body of air to move south. This brought record snow conditions to northern Europe, eastern Asia and eastern North America
Aug 3, 2017 | Science
Winter storms drive rapid phenotypic, regulatory, and genomic shifts in the green anole lizard
Aug 3, 2017 | Harvard Magazine
Sep 23, 2016 | Environmental Research Letters
Changes in meandering of the Northern Hemisphere circulation
Apr 12, 2016 | Scientific American Blog Network
What Is This Polar Vortex That Is Freezing the U.S.?