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Table of Contents - The Atmospheric Studies Group at TRC

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Section 7: Prognostic Meteorological Interfaces<br />

7.5 CALWRF Preprocessor<br />

CALWRF oper<strong>at</strong>es on the output from NCEP and NCAR’s We<strong>at</strong>her Research and Forecasting Model<br />

(WRF). WRF is a next-gener<strong>at</strong>ion mesoscale numerical we<strong>at</strong>her prediction system designed to serve both<br />

oper<strong>at</strong>ional forecasting and <strong>at</strong>mospheric research needs. CALWRF extracts and reform<strong>at</strong>s a subset <strong>of</strong> the<br />

gridded model output fields, and cre<strong>at</strong>es a 3D.DAT file for CALMET (see section 7.7).<br />

WRF has been a collabor<strong>at</strong>ive partnership, principally among the N<strong>at</strong>ional Center for <strong>Atmospheric</strong><br />

Research (NCAR), the N<strong>at</strong>ional Oceanic and <strong>Atmospheric</strong> Administr<strong>at</strong>ion (the N<strong>at</strong>ional Centers for<br />

Environmental Prediction (NCEP) and the Forecast Systems Labor<strong>at</strong>ory (FSL), the Air Force We<strong>at</strong>her<br />

Agency (AFWA), the Naval Research Labor<strong>at</strong>ory, the University <strong>of</strong> Oklahoma, and the Federal Avi<strong>at</strong>ion<br />

Administr<strong>at</strong>ion (FAA). WRF fe<strong>at</strong>ures multiple dynamical cores, a 3-dimensional vari<strong>at</strong>ional (3DVAR)<br />

d<strong>at</strong>a assimil<strong>at</strong>ion system, and a s<strong>of</strong>tware architecture allowing for comput<strong>at</strong>ional parallelism and system<br />

extensibility.<br />

<strong>The</strong> CALWRF processor runs on a UNIX pl<strong>at</strong>form.<br />

CALWRF Input Files<br />

WRF Output file<br />

CALWRF<br />

CALWRF.INP<br />

In CALWRF.INP, the user specifies the names <strong>of</strong> the output 3D.DAT file and list file, and the directory<br />

th<strong>at</strong> contains the WRF output files. <strong>The</strong> user may extract a subset <strong>of</strong> both the WRF grid and the WRF<br />

simul<strong>at</strong>ion period by specifying the beginning and ending indices <strong>of</strong> the WRF grid in the easting (X),<br />

northing (Y), and surface to top (Z) directions and the beginning and ending d<strong>at</strong>es for the desired<br />

processing period.<br />

An example <strong>of</strong> CALWRF.INP is given in <strong>Table</strong> 7-29 and is described in <strong>Table</strong> 7-30. In CALWRF.INP,<br />

the content after “!” is made up <strong>of</strong> comments th<strong>at</strong> are not read by the program. <strong>The</strong>re should be no blank<br />

space <strong>at</strong> the beginning <strong>of</strong> any records, but there should be <strong>at</strong> least one blank space before “!” if it exists.<br />

CALWRF Output Files<br />

CALWRF.LST<br />

<strong>The</strong> list file <strong>of</strong> CALWRF records various inform<strong>at</strong>ion from processing, including user-specified input<br />

controls, configur<strong>at</strong>ions <strong>of</strong> WRF files, processed files etc. This file should be consulted if CALWRF fails<br />

to produce a complete 3D.DAT. An example list file is given in <strong>Table</strong> 7-31.<br />

7-56

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