Supercells - Severe Convective Storms and Tornadoes: Observations and Dynamics - page 186

Figure 4.14c. Hook echoes in supercells. Radar reflectivity factor for supercells in northwest
Oklahoma on June 5, 2001 (as detected by the U. Mass. X-Pol mobile radar; range rings are
shown every 5 km). There are weak-echo holes inside the hook echoes in the supercells of May
29, 2001, June 5, 2001, and May 4, 2007. The hook echo (top) is very thin, while the hook echo
in Figure 4.14a (top) is relatively thick.