Diagnostic failure (diagnostics_obs.csh) within WRF-DART Tutorial

[braczka]

Describe the bug

Perform WRF-DART Tutorial per documentation . The tutorial will complete successfully. No fatal errors, and almost all diagnostics are produced correctly with this exception.

What was the expected outcome?

Expectation is mean_increment.nc is generated successfully.

What actually happened?

Mean_increment.nc file is empty because of failure during execution of mean_increment.ncl as part of diagnostics_obs.csh during driver.csh step.

Error Message

The following appears within the obs_diag.log file:

Copyright (C) 1995-2019 - All Rights Reserved
 University Corporation for Atmospheric Research
 NCAR Command Language Version 6.6.2
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details.
(0)        Extracting 2d variable T2_d01
fatal:No valid instance of variable T2_d01 found in file list
^Mfatal:["Execute.c":8637]:Execute: Error occurred at or near line 40 in file /glade/derecho/scratch/bmraczka/WRFv3.9.1_DART_Tutorial/output/2017042706/mean_increment.ncl

Which model(s) are you working with?

WRFv3 or WRFv4

Version of DART

11.3.1

Have you modified the DART code?

No

Build information

Derecho using gfortran

[hkershaw-brown]

fixed by #708