Ordinary-cell convective storms - Severe Convective Storms and Tornadoes: Observations and Dynamics - page 156

Figure 3.49. Idealized illustration of ''strong'' evolution (left column, showing vertical cross
section of updraft speed contoured and shaded, cloud outlined by scalloped line, and pre-
cipitation by hatching; time between successive frames is 3-5min. ), ''weak'' evolution (center
column), and ''quasi-steady'' evolution in a convective storm (adapted from Foote and Frank,
1983). Strong evolution is the mode of multicell ordinary-cell convection.
Figure 3.50. Example of a case in which the cell motion is the same as that of the mean wind (in
a vertical layer), and discrete propagation occurs along a gust front oriented in a meridional
direction, so that the storm motion vector lies to the right of the mean wind.