 The origins of Jerry were from a non @-@ tropical low pressure area over the central Atlantic on September 21 . The system meandered for two days , gradually developing deeper convection and gaining organization . On September 23 , the National Hurricane Center declared it a subtropical depression , as a warm core had developed but the system was still involved with an upper @-@ level low , and its strongest winds were well removed from the center . Early on September 23 , both satellite estimates and QuikScat data determined that the depression had strengthened into Subtropical Storm Jerry , despite the lack of a well @-@ defined inner core . 
