The Mount Washington Observatory in New Hampshire says​ its weather observers are "bracing for an extreme cold and wind event."

Some forecasters say a complex dance involving the polar vortex could send some of Earth's most extreme cold toward the United States.

Saranac Lake, N.Y., in the Adirondacks was the coldest place in the United States on Friday, recording a low of minus 22 degrees.

There are early signs that the northeastern United States may be in for several waves of below-average low temperatures this December.

One of the most important things people can do to stay safe is ensure they are dressed appropriately for the weather, Bedno said. In extreme cold, this means wearing layers, wearing loose clothing, covering exposed skin and protecting your extremities.

After a break on Wednesday and Thursday, another system is expected to impact the region heading into next weekend.

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