PHOTOS: Winter Storm Rex Brings Snow and Ice to Midwest, Northeast

February 18, 2014

Winter Storm Rex continues to bring a snowy, icy mess to parts of the Northeast after covering much of the Midwest on Monday.

The storm has caused flight delays at New York's LaGuardia Airport according to the air travel monitoring website FlightAware. More than 650 flights around the U.S. had been canceled by 9 a.m. EST.

Western Pennsylvania is seeing a rare "thundersnow," which, according to the National Weather Service, is an area of heavy snow with embedded thunder. Snow continues throughout Pennsylvania at a rate of 1 inch per hour on Tuesday morning, slowing the Pennsylvania Turnpike to a 45 mph speed limit.

"This system is going to energize as it gets up into New England this afternoon," said Tom Niziol, winter weather expert for The Weather Channel. "When this mid-afternoon time frame comes around, the snow is really going to pick up."

(MORE: Winter Storm Rex Forecast | State-by-State Impacts | Live Updates )

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