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Figure 4.14d. Hook echoes in supercells. (Top) Very thin and weak hook echo on May 12,
2004 near Attica, KS, as detected by the U. Mass. X-Pol mobile radar; small debris ball (arrow)
at the center of a developing tornado and spiral band curving the other way, as the tornado is
located at an inflection point of the rear-flank gust front. (Bottom) ''Hammerhead'' echo (as it
is colloquially known) in a supercell in northwest Oklahoma on June 5, 2001 (as detected by the
U. Mass. X-Pol mobile radar); the ''hammerhead'' echo consists of a pair of mirror image hook
echoes.
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