It can be seen that the YSU scheme produced a more distinct inversion at 850 hPa level than the MRF scheme. This is due to the fact that the MRF scheme mixes the air too much. As a result, the CAPE is larger in the YSU experiment than in the MRF. The weak low-level inversion was reported to be a problem of the MRF PBL (Bright and Mullen 2002). It was found that the YSU scheme simulated warmer and drier profiles at 850 hPa than the MRF (not shown), which indicates a possibility of resolving a typical problem with the MRF scheme in MM5.