A major winter storm that cut electric power to about 350,000 homes and businesses from Texas to the Ohio Valley was set to leave Pennsylvania and New England glazed in ice and smothered in snow yesterday, forecasters said. About 30cm of snow was expected to accumulate in northern New York and northern New England, but it was the ice that threatened to wreak havoc on travel and electric service in the northeast before the storm heads out to sea late yesterday and and today, said Rick Otto, a meteorologist for the US National Weather Service in College Park, Maryland. “Snow is a