Early on August 9 , Tropical Storm Cristobal merged with another weather system , when it was located about 350 miles ( 560 km ) to the southeast of Cape Hatteras , North Carolina . The low-level circulation interacted with the approaching frontal zone , and by 0000 UTC on August 9 Tropical Storm Cristobal was absorbed by the cold front about 350 miles ( 560 km ) southeast of Cape Hatteras , North Carolina .