<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Times New Roman; font-size: 12pt; color: #330033'><span>Hello wrf-users,<br><br>I am using CMC to drive WRF-NMM (V3.2). My input grib files contain dew point at 2m and dew point depression at other vertical levels (not RH).<br><br>I think that WRF needs as input an RH field. I noticed there is some code in the ungrib (rrpr.F) that looks like it should do the conversion for me (see at end of email).<br>My question is therefore ...is there something I should be doing to utilise this code, </span><span id="bc00ade8-a030-4e74-a8b7-d2c45ff1885c">as at present when I run
ungrib, RH does not appear in the intermediate file</span><span id="bc00ade8-a030-4e74-a8b7-d2c45ff1885c">? Should I set up my Vtable (and METGRID.TBL) differently?<br><br>Any ideas much appreciated.<br><br>This is the section of code I am referring to in in rrpr.F<br>! If surface RH is missing, see if we can compute RH from Specific Humidity<br>! or Dewpoint or Dewpoint depression:<br>!<br> if (.not. is_there (200100, 'RH')) then<br> if (is_there(200100, 'TT').and. &<br> is_there(200100, 'PSFC' ) .and. &<br> is_there(200100, 'SPECHUMD')) then<br> call get_dims(200100, 'TT')<br> call compute_rh_spechumd(map%nx, map%ny)<br> call mprintf(.true.,DEBUG, &<br> "RRPR: SURFACE RH is computed")<br> elseif (is_there(200100, 'TT' ).and. &<br> is_there(200100, 'DEWPT')) then<br> call get_dims(200100, 'TT')<br> call compute_rh_dewpt(map%nx, map%ny)<br> elseif (is_there(200100, 'TT').and. &<br> is_there(200100, 'DEPR')) then<br> call get_dims(200100, 'TT')<br> call compute_rh_depr(map%nx, map%ny, 200100.)<br> endif<br> endif<br><br>and the Vtable<br>wrf@model11:/var/domains/AUS9_CMC/wpsprd$ more Vtable<br>GRIB1| Level| From | To | metgrid | metgrid | metgrid |<br>Param| Type |Level1|Level2| Name | Units | Description |<br>-----+------+------+------+----------+---------+------------------------------------------+<br> 11 | 100 | * | | TT | K | Temperature |<br> 33 | 100 | * | | UU | m s-1 | U |<br> 34 | 100 | * | | VV | m s-1 | V |<br> 7 | 100 | * | | HGT | m | Height |<br> 11 | 105 | 2 | | TT | K | Temperature at 2 m |<br> 17 | 105 | 2 | | DEWPT | K | Dew point temperature at 2 m |<br> 33 | 105 | 10 | | UU | m s-1 | U at 10 m |<br> 34 | 105 | 10 | | VV | m s-1 | V at 10 m |<br> 81 | 1 | 0 | | LANDSEA | proprtn | Land/Sea flag (1=land,0=sea) |<br> 2 | 102 | 0 | | PMSL | Pa | Sea-level Pressure |<br> 80 | 1 | 0 | | SST | K | Sea Surface Temperature |<br> 76 | 100 | * | | QC | kg kg-1 | Cloud water mixing ratio<br>-----+------+------+------+----------+---------+------------------------------------------+<br><br><br>Cheers,<br><br>Liz<br><br><br>Dr. Elisabeth Donnell <br><br>weatherzone°<br>M 0425322032<br></span></div></body></html>