Πέμπτη, 15 Δεκεμβρίου 2016

Polar Vortex 2017 - What It Is and How Long It Will Last

A swirling mass of cold air usually stays parked at the poles, but sometimes that system can weaken, sending an Arctic blast southward into the U.S.

via Live Science http://ift.tt/2gMWIl3

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