It’s really, really cold again – as the US shivers through at least the eighth blast of air from the Arctic this winter. Here ...

The term “polar vortex” usually refers to the gigantic circular upper air weather pattern in the Arctic region, enveloping ...

The coldest burst of Arctic air this season is coming to put an icy exclamation point on America’s winter of repeated polar vortex invasions ... This winter, with record snow in New Orleans and ...

The term “polar vortex ... polar vortex event this season. Weather forces in the Arctic are combining to push the chilly air into the U.S. and Europe. With record snow in New Orleans last ...

See, for example, the below-zero wind chills Dallas endured Wednesday morning, or when New Orleans was buried under a record-breaking 8 inches of snow in January. The polar vortex has been ...

But at times some of the vortex can break off or move south, bringing unusually cold weather south and permitting warmer weather to creep up north.