MPH is developed in collaboration with Tony Craig, Brian Kauffman, Vince Wayland and Tom Bettge of National Center of Atmospheric Research, and Rob Jacobs and Jay Larson of Argonne National Laborotory. Vince Wayland of NCAR contributes for Makefiles on SGI and Compaq. Dan Anderson and Bill Celmaster of NCAR also help in the batch run script of Compaq. This work is supported by the Office of Biological and Environmental Research, Climate Change Prediction Program, under ACPI Avant Garde project, and by the Office of Computational and Technology Research, Division of Mathematical, Information, and Computational Sciences, both of the U.S. Department of Energy under contract number DE-AC03-76SF00098.