I'm simulating some low-pressure systems using the WRF-ARW 4.5.1 model. I've set two domains (d01:9 km; parameterised convection & d02: 3km; explicit convection), initial and boundary conditions are from ERA5, and I'm using the Noah Land-Surface Model. I want to see what happens to the track of these low-pressure systems when the soil moisture (in all four layers) over the land is set to 0% at all time steps. I'd then like to repeat the experiment by setting the soil moisture to 100% at all time steps. As a test experiment, I've disabled the Noah LSM in a simulation, which sets the soil moisture (SM) to 0.3 over the land and 0 over the sea. I'm not sure why this happens (perhaps due to MAXSMC = 0.339 in SOILPARAM.TBL?). From what I've understood so far, if I tweak the REFKDT parameter in the GENPARM.TBL file, I'll be able to adjust the infiltration factor. But I'm not sure if this is the correct way to achieve SM = 0% and SM = 100%. Does anyone know how to set the SM to a constant value in a Noah LSM?