The coldest weather of the season to date will be due to a phenomenon called a polar vortex ... She graduated from the University of Maryland, College Park and lives in Washington, DC.

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“Winter returned,” said Bob Oravec, lead forecaster at the National Weather Service in College Park, Maryland. The polar vortex of ultra-cold air usually stays penned up around the North ...

"Winter returned," said Bob Oravec, lead forecaster at the National Weather Service in College Park, Maryland. The polar vortex of ultra-cold air usually stays penned up around the North Pole ...