[Fwd: [Wrf-news] Important Bug Fix for WPS]

FYI

The RASP forecasts ( http://drjack.info/RASP ) - which use GFS - are
broken for the UK.

PaulS

-------- Forwarded Message --------
From: wrfhelp <wrfhelp@ucar.edu>
To: wrf-news@ucar.edu
Subject: [Wrf-news] Important Bug Fix for WPS
Date: Wed, 23 May 2012 17:58:42 -0600

Dear WRF Users,

Since May 22, 2012 (1200 UTC) real-time GFS GRIB2 data have changed. This is causing ungrib to extract incorrect data for surface fields. If your domain includes a pole or the Prime Meridian (0° longitude), program real may abort. If your domain lies elsewhere, the real program may not abort, but you will likely get incorrect surface fields.

If you are currently using Version 3.4, you will need to download the corrected file (rd_grib2.F), attached in this email. You will need to place this in your /WPS/ungrib/src directory and then recompile WPS (no need to 'clean -a' or reconfigure).

For users using older versions, you need to go into the /WPS/ungrib/src/rd_grib2.F file and search for these lines:

elseif(gfld%ipdtmpl(10).eq.101) then
                 ! MSL
                 level=201300.

Below that, you will need to add the following:

 elseif(gfld%ipdtmpl(10).eq.103) then
                 ! Height above ground (m)
                 if ( (gfld%ipdtmpl(12) .eq. 2. ) .or.
     & (gfld%ipdtmpl(12) .eq. 10.) ) then
                   level=200100.
                 else
                   cycle MATCH_LOOP
                 endif

Once you add this, save the file and recompile WPS. There is no need to perform a 'clean -a' or to reconfigure.

This has also been posted on the WRF Users' page. Please pass this information on to your colleagues if you know they may be using GFS real-time data.

Wrfhelp
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