Abstract
PSU/NCAR Mesoscale Modeling System (MM5) is used to perform a three-dimensional numerical simulation of symmetric instability. The model in this study is nonhydrostatic with Reisner cumulus parameterization and Reisner graupel explicit microphysics. The mesoscale simulation was performed with 18333-m horizontal resolution. The most intense precipitation occurred during 00-18 UTC 19 January 1986. Convective precipitation during this period was steady and had much lower intensity than stratiform precipitation. The evolution of stratiform precipitation had the same geographical distribution pattern as total precipitation allowing us to conclude that it was responsible for the precipitation maxima. We constructed three cross sections through the stratiform precipitation maximum during the 18-hour period. The analysis of these fields indicated the presence of sloping updrafts, buckling of M-surfaces, and areas of negative EPV allowing us to conclude that CSI was present in the area and SC was developing. A series of cross sections constructed through the precipitation area at a single time showed that sloping updrafts were only present within the absolute maximum of precipitation.
Stacey, Ioulia Matiouk (1997). Three-dimensional simulation of slantwise convection during GALE IOP1. Master's thesis, Texas A&M University. Available electronically from
https : / /hdl .handle .net /1969 .1 /ETD -TAMU -1997 -THESIS -S722.