Polar Vortex moving off the top of the globe, what that means for Great Lakes region - mlive.com
What is the Polar Vortex?
What is the Polar Vortex? | Waugh Research Group | Johns Hopkins University
Polar vortex - Wikipedia
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A Sudden Stratospheric Warming is coming, collapsing the Polar Vortex and potentially impacting the weather in late-month and early Spring » Severe Weather Europe
Stratosheric Warming, Polar Vortex may release cold air | wusa9.com
N.J. weather: What is the polar vortex, and could it boost our snow chances? - nj.com