Inadequacies in the Simple 3-Cell Model
The 3-cell model ignores the following complications:

1.  Seasonal changes:  The sun's path across the sky shifts northward in the northern summer and southward in
     the northern winter.  Hence the ITCZ, subtropical highs, polar fronts and associated jet streams and weather
     patterns all shift seasonally northward and southward.

2.  Daily changes:  The rotation of the earth constantly changes the sun's position in the sky at any place on earth
     and therefore constantly changes the rate at which solar energy reaches any position.  Thus many weather
     systems, especially mesoscale convective systems associated with the local solar heating of the surface such as
     thunderstorms, change dramatically within a few hours.

3.  Continents:  Variations in the nature of the surface affect the local absorption of solar radiation.  Furthermore
     continents offer more wind resistance than oceans and also block oceanic circulation.

4.  Mountains:  These offer much resistance to air circulation.

5.  Icefields:  These offer a variation in surface albedo.