IMPHYS specifies the moisture option(s) that will be compiled into the code and that will be set in the mmlif default namelist file that is generated by the mm5.deck script (if you chose to create one). Each integer c in the comma-separated list of values may be one of the following values:

For purposes of compilation only, the settings are cumulative and order is unimportant. That is, every option that appears in the list will be compiled in the code. If you intend to run the compiled executable directly with a hand-edited namelist file, you needn't bother with the order of the options. If you will rely on the mm5.deck script to run the MM5 job, then order becomes important, since this list is also used to generate the namelist file (mmlif) that is read in by the model as Fortran Unit 10 in the course of running the model using mm5.deck. For information on the mm5.deck mechanism as it relates to the MPP option, please click here.