mountains and too much rain

Discuss advection schemes, timestepping, pressure gradients, coordinates, etc.

mountains and too much rain

Postby pattim » Sat Aug 15, 2020 2:48 pm

Dear WRF users:
I'm forecasting (WRF v4.1) at ~ 1.4 km resolution over very rough orography (several each of 2.5 km mountain ranges over 1.3 km high-desert area). I'm not using a cumulus model due to the high resolution - and deep-convection is the main source of rain in this area. WRF-ARW predicts rain when all that occurs is virga. So it appears that what is occurring is that the model is under-predicting hydrometeor evaporation as it falls through the dry desert air. Is this reasonable or a known problem?

Does anyone have any suggestions on how to tweak the model for more accurate (i.e., decreased) rainfall in an appropriate manner, given these observations?

Thank you very much in advance!! :D

It has been suggested that the IC/BC data source (e.g., GFS vs. RR) may be most important...
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