Because the Arctic is warming twice as fast as the rest of the Earth, that temperature difference is getting smaller

Jennifer A. Francis, an Arctic researcher at Rutgers University.

 Temperature differences between the Arctic and the lower latitudes help create the jet stream. 

 Because the Arctic is warming twice as fast as the rest of the Earth, that temperature difference is getting smaller. 

 As a result, the jet stream is getting weaker and shifting its behavior, sending cold air south from the Arctic and pumping warm air north.

 https://www.nytimes.com/interactive/2018/03/23/climate/arctic-ice-maximum.html

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