 A broad area of low pressure gradually developed over the extreme southeastern Caribbean Sea on November 1 . It moved slowly westward and steadily organized . By November 4 , the system stalled to the north of Curaçao , which was followed by a turn to the northeast . Convection slowly organized as a surface circulation formed , and on November 5 the system developed into Tropical Depression Fifteen . Initially weak with only 20 mph ( 32 km / h ) winds , the depression steadily organized as it moved northeastward , and a Reconnaissance Aircraft mission confirmed the existence of the cyclone on November 6 as it was located midway between Puerto Rico and the Netherlands Antilles . Late on the 6th , the depression strengthened into Tropical Storm Klaus while located a short distance south of Puerto Rico . 
