 Late July 27 , a closed low @-@ level circulation ceased to exist and Dorian degenerated into an open trough . The remnants continued west @-@ northwest until August 1 , at which time the disturbance reached the western extend of a ridge and curved northward . Despite continued unfavorable wind shear , a broad area of low pressure formed off the east coast of Florida and became increasingly better defined . The convection gained enough organization for the system to be re @-@ designated as a tropical depression by 18 : 00 UTC on August 2 . However , strong northerly winds caused the depression to deteriorate into a remnant low about 24 hours later , southeast of Charleston , South Carolina . On August 4 , the remnant low was absorbed into a trough off North Carolina . 
