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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hello all,<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'>Today, one of our real-time runs experienced a somewhat
random error today. In one of the output files (specifically, the 8-hour
forecast file [we write out 1 frame per file]), some sort of “memory
shift” apparently took place when writing the NetCDF file. What
happened is that the last few elements of the XLAT array had some of the first
few elements from the XLONG array at the end, and the end of the XLONG array
has some of the XLAT values at the end. I included snippets of the end of
these ncdumps below so you can see what I mean. I only discovered
this because when animating some products from this run on GEMPAK, this one
particular forecast hour was shifted. The problem only occurred in this
one output file. <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 saved all of the input data and reran the case manually
with exactly the same executable, same compute nodes, etc. This time that
file was correct, so it appears to have been a random event (which scares me
even more). Has anyone else ever seen something like this happen? <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'>In case it matters, this was done with the RSL_LITE DM with
nesting version of WRF 2.2, compiled with MPICH 1.2.7p1 built with pgf90 and
pgcc (version 7.0-5) running on an x86_64 AMD Opteron-based Linux
cluster. The run was done using 5 processors (4 for domain decomposition
and 1 I/O node). <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'><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 Shaw<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'><Last snipped of ncdump –v XLAT><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>55.68303, 55.63144, 55.57923, 55.52641, 55.47297, 55.41893,
55.36428, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> 55.30902, 55.25315, 55.19668, 55.13961,
55.08193, 55.02365, 54.96478, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> 54.90531, 54.84525, 54.78459, 54.72334,
-123.3628, -123.1758, -122.9887, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> -122.8014, -122.6139, -122.4263,
-122.2386, -122.0506, -121.8626, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> -121.6743, -121.486, -121.2974, -121.1088
;<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'><Last snippet of ncdump –v XLONG><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>-78.80542, -78.49875, -78.19275, -77.88736, -77.58264,
-77.27859, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> -76.97522, -76.67249, -76.37045,
-76.06909, -75.7684, -75.46841, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> -75.16913, -74.87051, -74.57263,
-74.27542, 20.44331, 20.4799, 20.51613, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> 20.55199, 20.58751, 20.62265, 20.65743,
20.69184, 20.72591, 20.75959, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> 20.79292, 20.82587, 20.85846 ;<o:p></o:p></span></font></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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