Vertical Structure of a
 Stacked Wave Cyclone

• Mid-latitude cyclones are "deep" pressure systems which extend from the surface to the tropopause.
   

• They are examples of "cold core lows."
   

• For cyclogenesis to occur, a storm cannot  be vertically "stacked" as in the figure at the right.

(Similarly, as shown, strengthening anticyclones cannot be vertically "stacked.")