NEW YORK (Reuters) - Wet snow, sleet and rain fell across the Northeast on Wednesday in a storm that was expected to intensify through the day, forecasters said. Winter storm warnings were declared in regions surrounding Washington, D.C.; Wilmington, Delaware; Philadelphia, New York, Hartford, Providence and Boston, the National Weather Service said. The storm, which stretched from northern Alabama and Tennessee northeast to Massachusetts, was bringing sleet and rain to start and changing to heavy snow, the Weather Service said.A winter storm warning means significant amounts of snow, sleet and ice are expected or occurring, the Weather Service said, adding that strong winds were also possible.