wrf-model/WPS

Why is RH set to 5% between 300 and 70 hPa and Set RH to 0 above 70 hPa in WPS/ungrib/src/rrpr.F？

andrewsoong opened this issue · 3 comments

andrewsoong commented

Hello，
I just wonder that RH was set to 5% between 300 and 70 hPa and Set RH to 0 above 70 hPa in WPS/ungrib/src/rrpr.F.
（https://github.com/wrf-model/WPS/blob/master/ungrib/src/rrpr.F) lines: 686-697.
This makes the RH between 300 and 70 hPa in met_em_d0x.nc smaller than the GFS.

mgduda commented

The block of code you mention on lines 672 - 697 fills in levels in the RH field that are missing -- note the if-test on line 689. If the GFS provides larger values (or any values at all) for levels above 300 hPa, then the code in question should not be modifying the RH field.

andrewsoong commented

Thank you! But my RH of Met file is smaller than the GFS.

mgduda commented

@andrewsoong I would suggest posting this to the WRF support forum at https://forum.mmm.ucar.edu/.