In the wake of the powerhouse storm that will affect the Northeast with heavy rain and strong winds from Sunday night to Monday, sharply colder air will sweep in from Monday to Tuesday. But, included in the quick change to wintry conditions with areas of lake-effect snow and flurries will be brief bursts of heavy snow that can be dangerous for those traveling on the highways, AccuWeather meteorologists warn. The cold air won't quite meet up in time with the powerful storm moving through the Nort