Cold & Temperature
Polar Vortex
Definition
A large mass of cold air normally circling the Arctic in the upper atmosphere. When the vortex weakens, frigid Arctic air spills southward into North America and Europe, producing dangerous deep freezes.
A large mass of cold air normally circling the Arctic in the upper atmosphere. When the vortex weakens, frigid Arctic air spills southward into North America and Europe, producing dangerous deep freezes.