The polar vortex's icy grip on much of America has Arctic Greenland seeming like a toasty vacation spot by comparison.

Going into the weekend, temperatures will gradually improve. On Saturday, Dombek believes the city will record a high around 40 degrees and around 45 or so on Sunday.

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On Tuesday, expect the Lower 48 states to have an average low of 16.6 degrees Fahrenheit (minus 8.6 Celsius ... with temperatures as much as 35 degrees (19 degrees Celsius) below what’s ...

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.

On Tuesday, expect the Lower 48 states to have an average low of 16.6 degrees Fahrenheit ... with temperatures as much as 35 degrees (19 degrees Celsius) below what's normal for this time of ...