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'Polar Vortex' Will Bring Coldest Temperatures In Two Decades

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The area around the nation's capital is bracing for what could be the coldest temperatures in two decades.

The National Weather Service says air temperatures around D.C. and Baltimore are probably going to be in the low single digits by tonight and the wind will make it feel even colder.

The potentially record-breaking cold snap is being caused by what meteorologists call a "polar vortex" — a formation of frigid, arctic winds that have been displaced unusually far south over the Great Lakes. It's causing freezing temperatures and gusty winds across much of the northeast and midwest.

The forecast for tonight anticipates temperatures of three degrees at the Reagan National Airport and two degrees at BWI airport.

A meteorologist for the National Weather Service says if those temperatures occur they would be the coldest temperatures observed in 20 years.

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