 An area of disturbed weather extended from the northwestern Caribbean Sea to the western Atlantic Ocean on October 4 , possibly related to the remnants of Hurricane Karen . The system slowly organized , developing a surface low pressure on October 8 to the northeast of the Turks and Caicos Islands . Convection associated with the storm steadily increased as the low moved towards the northeast . By October 11 , the low organized into Tropical Depression Fifteen about 740 mi ( 1 @,@ 190 km ) east @-@ southeast of Bermuda , after the convection had persisted for about 12 hours . An upper @-@ level low to the west caused strong southwesterly wind shear , which inhibited development . 
