By Rich McKay

Dec 2 (Reuters) – An intensifying weather system was expected to bring heavy snow and rain to parts of the U.S. Midwest, the Appalachians and the Northeast on Tuesday, with more than 50 million Americans under a winter storm advisory.

Up to a foot of snow is forecast to fall across the Ohio Valley, Pennsylvania, upstate New York and into New England, with some areas getting up to an inch an hour, said Ashton Robinson Cook, a forecaster at the National Weather Service’s Weather Prediction Center.

“If you don’t have to be on the roads today, stay home,” Cook said. “In areas of heavy snow, it’s best not to travel. But if you have to go out, give yourself a lot of extra time.”

Light to moderate snow was already falling from western Pennsylvania to central New England on Tuesd

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