This storm became stronger while it fed off the warm air from the remnants of Grace and the cold air to the north , and it became a powerful nor ` easter . This nor ` easter caused extremely high waves and severe damage along the U.S. East Coast . Fed by the contrast between cold air to the northwest and warm air from the remnants of Hurricane Grace , this storm became a large and powerful nor ` easter that caused extremely high waves and resulted in severe coastal damage along the U.S. East Coast .