This directory contains an illustration of how we converted ALADIN winds in
GRIB format into wind stress in an ASCII format readable by the HOPS PE_forcing
code.

The basic process proceeds in 3 stages

   (1) All individual GRIB files are dumped in an ASCII format
       using WGRIB

          http://www.cpc.ncep.noaa.gov/products/wesley/wgrib.html

       An example of the syntax used is provided in the script

          wgrib_job

       This script uncompresses the file

          CLSVENT_ZONAL_00.grb.gz

       issues the desired WGRIB command and recompresses GRIB file.
       This process produces 2 output.  The first is the dumped
       ASCII file

          CLSVENT_ZONAL_00.dat (gzipped in this directory)

       The second is some diagnostic output, useful is determining
       grid size and spacing.  This output has been captured in

          wgrib_job.log

       This process is repeated for the meridional component of wind.

   (2) The next step is to select the wind fields that span the
       desired period with the shortest forecast durations.  To
       do that, we had a program (MKALADWIND) to scan the available
       files and automatically select the desired files.  That code
       is available in

          find_aladin.tar.gz

       It was written assuming that the ALADIN wind fields were stored
       in the following directory structure

                   ... __________2005__________ ...
                      /          /  \          \
          ... Jul26_12   Jul27_00    Jul27_12   Jul28_00 ...

       which segregated the GRIB files (and the step 1 conversions) by
       the twice daily issuance.  The program MKALADWIND would then
       scan the expected files, according to the instructions in

          mkaladwind_27Jul2005.in

       to find the desired set of winds.  For it's output, it wrote the
       input file for step 3

          aladwind27Jul2005.in

   (3) The next step is to take each of the wind fields selected in step
       2, construct wind stress and combine the results in a single data
       file for ingestion by PE_forcing.  The program we have for this
       (ALADWIND) is available in

          aladin_wind.tar.gz

       It reads the output of step 2

          aladwind27Jul2005.in

       and produces the input for PE_forcing

          dat.27Jul2005.wstr.gz

       It also produces a record of the maximum wind speed for each wind
       field and the maximum of all wind fields.  This is used as a quick
       check on the conversion process.

          log.27Jul2005.gz

One final note.  We combined steps 2 and 3 in one script:

   ProcJob