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<p class="MsoNormal">The GFS data files will be updated next month probably around 17 December 2014, with changes to the filenames and the addition of 0.25-degree-resolution data. See
<a href="http://www.nws.noaa.gov/om/notification/tin14-46gfs.htm">http://www.nws.noaa.gov/om/notification/tin14-46gfs.htm</a> for the announcement. Most importantly for WRF users, the soil temperature representation within the grib2 file is being changed.
From the announcement:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Courier New";color:black">Rename TMP at 0-0.1 m, 0.1-0.4 m, 0.4-1.0 m, and 1-2 m to the</span><span style="font-size:10.5pt;font-family:Consolas;color:black">
</span><span style="font-size:10.5pt;font-family:"Courier New";color:black">more accurate name of Soil Temperature (TSOIL)</span><span style="font-size:10.5pt;font-family:Consolas;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This will require a change to the Vtable.GFS file for the ungrib program to pick up the renamed fields. Based on testing of the parallel data that is currently being posted, here are the changes to the Vtable.GFS that you need to make:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">From the current Vtable.GFS …..<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:6.5pt;font-family:"Courier New"">11 | 112 | 0 | 10 | ST000010 | K | T 0-10 cm below ground layer (Upper) | 0 | 0 | 0 | 106 |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:6.5pt;font-family:"Courier New"">11 | 112 | 10 | 40 | ST010040 | K | T 10-40 cm below ground layer (Upper) | 0 | 0 | 0 | 106 |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:6.5pt;font-family:"Courier New"">11 | 112 | 40 | 100 | ST040100 | K | T 40-100 cm below ground layer (Upper) | 0 | 0 | 0 | 106 |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:6.5pt;font-family:"Courier New"">11 | 112 | 100 | 200 | ST100200 | K | T 100-200 cm below ground layer (Bottom)| 0 | 0 | 0 | 106 |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:6.5pt;font-family:"Courier New"">11 | 112 | 10 | 200 | ST010200 | K | T 10-200 cm below ground layer (Bottom) | 0 | 0 | 0 | 106 |<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The updated Vtable.GFS lines….<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:6.5pt;font-family:"Courier New"">11 | 112 | 0 | 10 | ST000010 | K | T 0-10 cm below ground layer (Upper) | 2 | 0 | 2 | 106 |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:6.5pt;font-family:"Courier New"">11 | 112 | 10 | 40 | ST010040 | K | T 10-40 cm below ground layer (Upper) | 2 | 0 | 2 | 106 |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:6.5pt;font-family:"Courier New"">11 | 112 | 40 | 100 | ST040100 | K | T 40-100 cm below ground layer (Upper) | 2 | 0 | 2 | 106 |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:6.5pt;font-family:"Courier New"">11 | 112 | 100 | 200 | ST100200 | K | T 100-200 cm below ground layer (Bottom)| 2 | 0 | 2 | 106 |<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:6.5pt;font-family:"Courier New"">11 | 112 | 10 | 200 | ST010200 | K | T 10-200 cm below ground layer (Bottom) | 0 | 0 | 2 | 106 |<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The other lines in the should remain the same.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve made a single test run with the new Vtable that appeared to complete successfully. Without this change, ungrib does not pick up the soil temperature and your WRF job may fail. Further testing by users is certainly called for using
the parallel data being posted by NCEP before the new data goes operational next month.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif">masters.steve@ensco.com<o:p></o:p></span></p>
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