NEW YORK — A major snowstorm with blizzard-like conditions could drop a foot or more of snow across most parts of the Northeast as they gear up for the workweek right after the first real storm of the winter hit them with rain, several inches of snow and messy slush.A storm system diving out of the Midwest has the potential to slowly coat from Philadelphia up to Massachusetts and Maine with snow beginning late Sunday night into Monday and intensifying greatly well into Tuesday, the National Weather Service said.