Large-scale vertical velocity forcing (forc_wa) in casegen

[hertneky]

It seems that while forc_wa is intended to be active, the associated vertical velocity is not being read from the UFS history files and is consequently set to zero.

In my recent SFS work with casegen using zero wa(dzdt) forcing, I found the SCM results to be unsatisfactory compared to UFS simulation, particularly in simulating tropical precipitation over the Indian Ocean. To address this, I conducted a comparative experiment where I reintroduced proper wa forcing during case generation. The results indicated a notable improvement (in my subjective assessment) in precipitation simulations for both hydrostatic and nonhydrostatic scenarios within the SFS project. For hydrostatic cases, I utilized forc_wap since there is no wa (dzdt), but utilized wap (omga) output from the hydrostatic runs.