Mesoscale convective systems - Severe Convective Storms and Tornadoes: Observations and Dynamics - page 274

Figure 5.10. Vertical cross section through a squall line MCS. (Top) Idealized model (from
Houze et al., 1989). (Bottom) From quad-Doppler analysis of a bow echo on June 10, 2003
near St. Louis, MO during BAMEX. System-relative winds (vectors) and radar reflectivity
factor in dBZ (from Davis et al., 2004).
Coriolis force turns the rear-inflow jet to the right, which advects the cold pool in
that direction, so that new cells are generated along this edge of the cold pool.
When symmetric MCSs evolve into asymmetric MCSs, the stratiform precipitation
region (area) shifts location (usually poleward when the leading convective line is
oriented mainly in a meridional direction).