The diurnal cycle in shortwave radiation accounts for 77.5 percent of the load imbalance in PCCM2 physics. The remaining 22.5 percent of imbalance is caused by load imbalances in mass flux convective parameterization (17 percent), gravity wave calculation (2.7 percent), vertical diffusion (1.4 percent), surface temperature calculation (less than 1 percent), and cloud parameterization (less than 1 percent). The load imbalances are from surface type and what is loosely termed weather patterns.