However , deep convection was kept near the increasingly organizaing center , and at 0300 UTC on August 15 the National Hurricane Center named it as Tropical Depression Five about 425 miles ( 685 km ) southeast of Brownsville , Texas . However , deep convection was maintained near the increasingly organizing center , and at 0300 UTC on August 15 the National Hurricane Center classified it as Tropical Depression Five about 425 miles ( 685 km ) southeast of Brownsville , Texas .