These severe cold events occur when the polar jet stream – the familiar jet stream of winter that runs along the boundary ...

The "polar vortex" is a large low-pressure system that lives around the Arctic Circle but occasionally can be split up and send extremely cold weather to lower latitudes like New York. If the ...

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Every once in a while, the polar vortex gets split into two centers of circulation, one of which can sink southward into North America. This lasts a couple of weeks before it becomes a single ...

when the polar vortex will be attacked on multiple fronts by high pressures. The push of high pressure towards the North Pole and North America will destabilize the vortex, triggering a split that ...

However, if a breakdown of the polar vortex, known as a “split,” occurs, the chances of a significant freeze increase considerably. In this second case, cold air masses could invade Northern ...