Re: Radar image, Gulf Coast
Given the persistence of the images and the slow eastward drift in the course of an hour or so, I believe that you are correct in that most of these images appear to be of a cloud of some kind generated by the passage of the Shuttle and its debris, and not of the debris itself, although the first image I downloaded (gone for now, linked here soon I hope) did appear more as narrow rapid streaks that could have been debris.