Actually, the average tropical cyclone moves from east to west in the tropical trade winds that blow near the equator. As it approaches the North American Continent, it comes under the steering winds produced by the Bermuda High... a rather fixed high pressure area that causes the approaching tropical storm to steer south. The Bermuda High is the primary reason that some tropical storms that become hurricanes move northward up the eastern seaboard once the storm is east-southeast of Bermuda... By the way, hurricanes and typhoons are the same basic weather phenomena, except that typhoons are in the Pacific and Indian Oceans...