Hurricane 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 record-keeping. Tropical
systems are typically guided westward from the Atlantic to the Caribbean
by high pressure, then may curve to the northeast if they encounter a
dip in the jet stream over North America. 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.
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