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Polar Vortex to Slam East Coast with Frigid Weather This Valentine's Day

US weather map 2016
Valentine's Day is going to be chilly, except for people on the West Coast. (Image credit: NOAA, National Weather Service)

This Valentine's Day, some couples may have to cuddle up for warmth as the polar vortex moves south, bringing an icy blast and the coldest temperatures of the season to the northeastern United States this weekend, meteorologists say.

Temperatures are projected to be well below average — about 25 to 30 degrees Fahrenheit (14 to 17 degrees Celsius) lower than normal — over a good portion of the eastern United States, said Bob Oravec, a lead forecaster at the National Weather Service (NWS) in College Park, Maryland.

"Saturday and Sunday look very cold and very windy," Oravec told Live Science. "We'll have much-below-average temperatures, and with the wind chill, values are going to be well below zero for a good chunk of the eastern United States." [Photos: The 8 Coldest Places on Earth]

Winter weather, such as freezing rain and snow, is also predicted for Monday (Feb. 15) in that region, he said.

A short-term forecast showing this weekend's weather. (Image credit: NOAA)

The polar vortex is the main reason for the frigid temperatures. Typically, the vortex spins around the Arctic, circling from west to east and trapping cold air in the high northern latitudes. However, if the spinning weakens, cold air can escape and head southward.

"It's farther south than normal," Oravec said. "It's helping to support the southward push of very cold air out of Canada and into the eastern United States over the weekend."

The freezing cold this weekend could break some winter weather records, he added.  

The areas downwind of the Great Lakes are expecting 6 to 10 inches (15 to 25 centimeters) of snow Friday and Saturday, and the Northern Plains and Midwest will likely experience temperatures 10 to 20 degrees F (6 to 11 degrees C) lower than usual, according to the NWS.

North Carolina is expected to get some light snow or freezing rain today (Feb. 12), according to the NWS. This weather pattern — a weak area of low pressure — may move up the coast and "clip coastal Maine with up to a foot of snow," NWS officials said.

Meanwhile, the West Coast will have relatively warm weather this weekend, although rain is predicted for the Northwest. "That's pretty typical, too — you often have the opposite effect on the one side of the country to the other," Oravec said.

His advice? Stay inside and avoid frostbite if you're in the Northeast.

"The takeaway is that it's going to be very cold," Oravec said. "As we come into the beginning of next week, we'll start to see a warming trend, even though it will probably be more midweek."

Follow Laura Geggel on Twitter @LauraGeggel. Follow Live Science @livescience, Facebook & Google+. Original article on Live Science.

Laura Geggel
As an associate editor for Live Science, Laura Geggel covers general science, including the environment, archaeology and amazing animals. She has written for The New York Times, Scholastic, Popular Science and Spectrum, a site covering autism research. Laura grew up in Seattle and studied English literature and psychology at Washington University in St. Louis before completing her graduate degree in science writing at NYU. When not writing, you'll find Laura playing Ultimate Frisbee.