Mesoscale convective systems - Severe Convective Storms and Tornadoes: Observations and Dynamics - page 295

Figure 5.23a. Bow echoes as depicted by WSR-88D radars. Radar reflectivity color-coded in
dBZ. (Top, left) A symmetric, narrow bow echo on June 16, 2010 entering the northwestern
Texas Panhandle. (Top, right) An isolated short bow echo line segment on May 29, 2007 over
the Oklahoma and northern Texas Panhandle. (Bottom) Short bowed line segments (indicated
by white arrows) in Oklahoma on May 7, 2008.
LFC is reached ( Figure 5.26, top panel). In this scenario, which occurs later on in
the lifetime of an MCS, after a substantial cold pool at the surface has been built
up, and in an environment of only weak-to-moderate vertical wind shear, tilting
results in an anticyclone to the right of baroclinically generated, low-level easterly
vertical shear and a cyclone to the left of the easterly vertical shear (to the south
and north, respectively, in the Northern Hemisphere, when the MCS leading line
has a meridional orientation). These vortices are lifted and advected rearward by