A very interesting feature is apparent in this evening's radar loop from Key West, FL, with several curved bands of higher reflectivity values over the Gulf of Mexico to the west and south of the radar site. They appear to be some kind of mesoscale convergence zones, but also could be a non-meteorological phenomenon like chaff plumes, which are clouds of aluminum-coated glass fibers released by the military to confuse enemy aircraft -- but usually for test purposes in the U.S. of course. Any thoughts on what this might be??