(a) Development of cloud bands and cellular convection over a cold air outbreak: The sea surface temperature and cloud distribution after 2 hours of simulation. (Color levels shown to the right; units in K.) Grid points with liquid water content ql greater than 0.0005 are enclosed. The thin red and orange lines identify the lowest cloud level at z = 300 m. Cold air enters the calculating domain from the left with mean wind u = 10 m s-1. (b) Vertical velocity w at z = 50 m level after 2 hours of simulation. (Color levels shown to the bottom; units in m s-1.) (Hsu et al. 2004)