Supercells - Severe Convective Storms and Tornadoes: Observations and Dynamics - page 180

Figure 4.11b. Example of a crescent-shaped BWER in a supercell in the Oklahoma Panhandle
on May 31, 2007. (Top) 1.9 elevation angle scan. Solid white line is the approximate location
of the 20 dBZ e contour at 8.6 elevation angle. (Bottom) 8.6 elevation angle scan (from the
MWR-05XP radar). The BWER, which is seen aloft, is crescent shaped because it merges with
the narrow notch, which is seen at low elevation angles.