Two features observed with radar that meteorologists use to identify theocation where a tornado may be occurring are:
(a) high (cold) cloud tops on the infrared channel and a sharp, clear/cloud boundary on the water vapor channel.
(b) strong vertical shear on the sounding and a weak inversion in the lowertroposphere.
(c) a hook echo in the radar reflectivity field and a tornado vortex signature in the radar radial velocity field.
(d) extremely high reflectivity and cloud tops above 10 kilometers.
(e) None of the above are correct.