a. Downloading Test Data
This page
describes how to access test data sets required to run WRF-Var. If you don't
know anything about WRF-Var, you should first read the Introduction
section.
i. Required
Data
The WRF-Var system requires three input
files to run: a) A WRF first guess
The following table summarizes the above
info:
|
Input Data |
Format |
Created By |
|
First
Guess |
NetCDF |
WRF
Pre-processing System (WPS) Or WRF |
|
Observations |
ASCII (NCEP-PREPBUFR
also possible) |
Observation
Preprocessor (OBSPROC) |
|
Background
Error Statistics |
Binary |
WRF-Var
gen_be utility |
In the online tutorial, example input files
are given. However, in your own work after the tutorial, you will need to
create the input data sets yourselves.
ii. Downloading Test Data
In the online tutorial, we will store data
in a directory defined by the environment variable $DAT_DIR. This directory can be in any location that can be
read and written to from your current machine and which has at least 100 MB of
free space available (for this test case; more space may be needed for other
cases). Type
setenv
DAT_DIR dat_dir
where dat_dir
is your chosen directory. If the directory pointed to by $DAT_DIR does not
already exist, create it now; then, change to this directory by typing
cd
$DAT_DIR
Download the tutorial test dataset for a
CONUS 12 UTC 1 January 2003 test case from
http://www.mmm.ucar.edu/wrf/src/data/WRFV3-testdata.tar.gz
Once you have downloaded the WRFV3-testdata.tar.gz file to $DAT_DIR
gunzip
WRFV3-testdata.tar.gz
tar
-xvf WRFV3-testdata.tar
You should then see a number of data files
that will be used in the tutorial.
rm
wrfvar-testdata.tar
iii. What next?
OK, now you have downloaded the necessary
data, and you’re ready to pre-process the supplied observation file. Proceed to
b. The WRF-Var
ObservationPreprocessor (OBSPROC)
Trouble Shooting:
1. Having trouble, ask