WRF Precipitation rate

[judith40124]

Hello! I'm new to WRF, and was wondering how WRF derived the RAINNC and RAINC. In theory, we could calculate
rain rate = ρ_air/ρ_water * QRAIN * Vt * 3600(in mm/hr)

Vt fall velocity: Vt =(ρ_a/ρ_w)^k * ar * D^bv

What are the variables that WRF takes into account for deriving RAINNC and RAINC?

Thank you!

 

[kwerner]

Hi,
This is dependent on the physics options that you choose. I recommend going to the WRF/phys/ directory and do a search for RAINNC and RAINC in the *.F files, and then look at the code for the options you're using.