Supercells - Severe Convective Storms and Tornadoes: Observations and Dynamics - page 231

Figure 4.45. Illustration of the relationship between SREH and the area under the hodograph
swept out by the storm-relative wind vector from z ¼ 0toz ¼ h. (Top) Area elements used in
the first, third, and fourth terms on the RHS of (4.61); (bottom) area elements used in the
second term on the RHS of (4.61).
fronts and outflow boundaries, which may be associated with relatively high
values of vertical shear, also manifest as horizontal vorticity, which is available to
be tilted onto the vertical at the edges of zones of rising motion that are found
along and near them.