 While moving north @-@ northwestward , satellite and reconnaissance aircraft reports indicated the depression strengthened into Tropical Storm Jerry early on October 13 . Jerry then gradually intensified and moved northward between 5 and 10 mph ( 10 and 15 km / h ) . Early on October 14 , the storm turned to the north @-@ northeast and decelerated in response to an approaching mid- to upper @-@ level trough . Increasing upper @-@ level wind shear temporarily limited further intensification . However , after a mid- to upper @-@ level cut @-@ off low pressure area moved southward , the upper @-@ level outflow pattern became more favorable , causing Jerry to resume strengthening . The cut @-@ off low then forced Jerry to re @-@ curve north @-@ northwestward , while stronger steering currents and a high pressure ridge increased the storm 's forward motion to more than 10 mph ( 16 km / h ) . While approaching the Gulf Coast of the United States , deep convection began to develop near the center , and by 1800 UTC on October 15 , Jerry strengthened into a Category 1 hurricane . 
