WeatherWhys for November 18,2014 from accuweather.com

Lenny spent its entire lifespan traveling in a west-to-east fashion from the central Caribbean to the Atlantic, which was unprecedented in the history of tropical recordkeeping. In Lenny's case, a large dip in the jet stream was in place over the western Atlantic and put the hurricane on its eastward track and on a collision course with the northern Leeward Islands.