=o= 
Turning to hurricane tracks, one observes that since the beginning of 
the century the location of the tracks has undergone a marked cycle. In the 
early years recurvatures in September took place mostly east of Florida (fig. 
10). They then shifted westward to the Gulf between 1910 and 1920; later they 
returned at first to Florida and adjoining waters, finally to the West Atlantic. 
The shift in average recurvature longitude is no less than 20° near latitude 
25°N and must be accepted as reale 
During the years when the tracks migrated westward ocean temperatures 
decreaged, and during the years when the tracks returned eastward, they ros@o 
Figo ll shows five-year average anomalies corresponding to parts of the periods 
with easternmost and westernmost track positions. Patterns are out-of=phases3 
the period 1932-36 agress with fig. 5. Correlation bstween sea temporatures 
and hurricane tracks is excellent, but a direct connection appears difficult 
to establish. A change in resurvature longitude, as indicated by fige 10, 
should from all knowledge of hurricane motion be related to changes in the 
position of mean troughs and ridges in the westerlies. Direct evidence does 
not exist from the years studisd, but a glance at figo 8 will show that the 
track changes are correlated well with sea-level pressure near Bermuda. 
Tracks shifted westward with rising pressure and eastward with falling pres- 
suree If the pressure changes reflect east-west displacements of the Azores- 
Bermuda High, the track displacements can be interpreted as due to general 
circulation changeso 
