As Polar Vortex Moves Out, Warmer Temps and Snow Move In - NBC Bay Area
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As Polar Vortex Moves Out, Warmer Temps and Snow Move In

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    A student walks past vented steam in freezing temperatures on the University of Pennsylvania campus, Tuesday, March 4, 2014, in Philadelphia.

    Cold weather records across the Northeast were shattered on Valentine's Day after the polar jet stream shot a mass of Canadian arctic air south. Warmer temperatures are expected Monday — but so is more hazardous weather, with snow, freezing rain and some potential flooding on the way.

    Sunday began with bone-chilling lows: In Boston, thermometers dipped to minus 9 degrees — the coldest day since Jan. 15, 1957, according to The Weather Channel — while in New York City, Central Park registered minus 1, the lowest reading in 22 years.

    So it went from Newark, New Jersey, to Hartford, Connecticut, to Watertown, New York, where temperatures plunged to a staggering (and all-time record) minus 37 degrees. Across much of the region, the wind chill drove thermometers down even further.

    In Boston, the cold damaged subway lines, cracking one and sending others out of alignment. At Logan Airport, more than 200 flights were delayed because of "minor problems with ground equipment," officials said.