WRF - Developmental Testbed Center

NARR_3D:2008-08-16_12NARR_3D:2008-08-16_15NARR_3D:2008-08-16_18...Given intermediate files for the 3-dimensional fields, we may process the surface fieldsby linking the surface GRIB files and changing the prefix variable in the namelist:&ungribout_format = 'WPS',prefix = 'NARR_SFC',/Again running ungrib.exe, the following should exist in addition to the NARR_3D files:NARR_SFC:2008-08-16_12NARR_SFC:2008-08-16_15NARR_SFC:2008-08-16_18...Finally, the fixed file is linked with the link_grib.csh script, and the prefix variable inthe namelist is again set:&ungribout_format = 'WPS',prefix = 'NARR_FIXED',/Having run ungrib.exe for the third time, the fixed fields should be available in additionto the surface and "3D" fields:NARR_FIXED:1979-11-08_00For the sake of clarity, the fixed file may be renamed to remove any date information, forexample, by renaming it to simply NARR_FIXED, since the fields in the file are static. Inthis example, we note that the NARR fixed data are only available at a specific time,1979 November 08 at 0000 UTC, and thus, the user would need to set the correct startingand ending time for the data in the &share namelist record before running ungrib on theNARR fixed file; of course, the times should be re-set before metgrid is run.Given intermediate files for all three parts of the NARR data set, metgrid.exe may be runafter the constants_name and fg_name variables in the &metgrid namelist record areset:&metgridconstants_name = 'NARR_FIXED',fg_name = 'NARR_3D', 'NARR_SFC'/Although less common, another situation where multiple data sources would be requiredis when a source of meteorological data from a regional model is insufficient to cover theWRF-NMM V3: User’s Guide 3-18