Plate 1. First LES experiment with thermal free convection only, 1.25 days after initiation of an upward surface heat flux of 200 watts/m^2. (a) Three-dimensional depiction of constant-temperature surfaces in a 3.6-km cube. Blue is -1.806C, and green is -1.802C. (b) Cellular mesoscale convection cells predicted for the surface temperature field. Area shown is 7.2 km x 7.2 km. Cyclical horizontal boundary conditions enable the depicted area to be expanded four-fold for visual effect.