 The remnants of Dean turned to the north , and became embedded within a large mid @-@ level trough off the East Coast of the United States . Convection increased around the system early on August 24 . The system became better organized , with indications of a broad surface circulation forming about 400 miles ( 645 km ) west @-@ southwest of Bermuda . However , a reconnaissance flight into the remnants of Dean reported a broad low pressure area with the strongest winds and convection located far from the area of minimum pressure , indicating it had some non @-@ tropical characteristics . The weak disturbance passed to the west of Bermuda early on August 25 , and subsequently began to drift to the northeast . The remnants of Dean produced convection near its developing circulation , and on August 26 , while located 220 miles ( 350 km ) north of Bermuda the system organized sufficiently enough to be re @-@ classified a tropical depression . Operationally , the National Hurricane Center did not re @-@ initiate advisories until fifteen hours later . 
