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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thorsten,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Since you referred to your output files using “d0*”,
I am assuming you are running a nested grid configuration. Is the LU_INDEX in
your main, outer grid constant as well?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I ask this because we discovered a small problem with the
Registry.EM settings when running nests. We were using a 15/5/1km nest
configuration, and discovered that the land use index (LU_INDEX) on the 5 and 1
km nests looked remarkably like 15km grid cells, even though we were specifying
“fine_input_stream = 2” for all our nests, which is supposed to
cause the terrain, land-use, and other high-res static or masked fields to be
read from the wrf_input* files while interpolating the atmospheric fields from
the parent grid. In our case, all of the static fields looked correct except
LU_INDEX, which was obviously being interpolated from the parent. It turns out
that the line for “LU_INDEX” in the Registry.EM was needed to have “012”
added right after the “i” in the I/O control column so that it
would be included when fine_input_stream =2. Changing the Registry.EM and
recompiling fixed the problem. It was really causing poor forecasts in our
fine nests for the near-surface fields, because the LU_INDEX impacts roughness lengths,
etc., so on our 1km grid you could see obvious “reflections” of the
15km grid in the 2m temp and moisture, 10m U/V, etc. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Maybe this isn’t your problem, but I am sure there are
others out there that need to know this. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Best regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Brent<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>---------------------<o:p></o:p></span></font></p>
<p class=MsoNormal><st1:PersonName w:st="on"><strong><b><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Brent Shaw</span></font></b></strong></st1:PersonName><o:p></o:p></p>
<p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial'>Senior Meteorologist</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial'><a href="http://www.wdtinc.com/">Weather Decision
Technologies Inc</a>.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial'>1818 W. Lindsey <st1:place w:st="on">St.</st1:place> 208D</span></font><o:p></o:p></p>
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=1
face=Arial><span style='font-size:7.5pt;font-family:Arial'>Norman</span></font></st1:City><font
size=1 face=Arial><span style='font-size:7.5pt;font-family:Arial'>, <st1:State
w:st="on">OK</st1:State> <st1:PostalCode w:st="on">73069</st1:PostalCode></span></font></st1:place><o:p></o:p></p>
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=1
face=Arial><span style='font-size:7.5pt;font-family:Arial'>Mobile</span></font></st1:City></st1:place><font
size=1 face=Arial><span style='font-size:7.5pt;font-family:Arial'>: (405)
397-9950</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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