The PSU/NCAR mesoscale model (known as MM5) is a limited-area, nonhydrostatic, terrain-following
sigma-coordinate model designed to simulate or predict mesoscale atmospheric circulation. The model
is supported by several pre- and post-processing programs, which are referred to collectively as the
MM5 modeling system. The MM5 modeling system software is mostly written in Fortran, and has been
developed at Penn State and NCAR as a community mesoscale model with contributions from users worldwide.