From 3b3811073da6991aeddc48be7c64a2ea2bfd79b0 Mon Sep 17 00:00:00 2001
From: Stefano Serafin <serafin@srvx1.img.univie.ac.at>
Date: Fri, 5 May 2023 15:30:16 +0200
Subject: [PATCH] updated WRF.md

---
 WRF.md | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/WRF.md b/WRF.md
index 0e948e4..a27fd93 100644
--- a/WRF.md
+++ b/WRF.md
@@ -69,6 +69,8 @@ The WRF source code is available on [Github](https://github.com/wrf-model/WRF),
 
 ### Compiling
 
+If you already have a compiled version of WRF, go to the next step.
+
 Compiling WRF for an idealized simulation (LES):
 
 ```sh
@@ -106,7 +108,9 @@ ln -s $WPS_PATH/met_em* .
 ./wrf.exe
 ```
 
-The `met_em*` files linked in this snippet are the outcome of the WRF preprocessing (interpolation of initial and boundary conditions from another model, or from reanalyses, on the WRF grid). The WRF preprocessing system (WPS) is a separate set of executables, that can be built only after WRF is successfully compiled. To run WPS for a real-case simulation, getting initial and boundary conditions from ECMWF-IFS data on model levels, you could use a script such as the following. However, it depends on namelists, variable tables and other settings files being correctly specified. See below for details.
+The `met_em*` files linked in this snippet are the outcome of the WRF preprocessing (interpolation of initial and boundary conditions from another model, or from reanalyses, on the WRF grid), and they are supposed to be in a directory, to which the environmental variable `$WPS_PATH` points. 
+
+The WRF preprocessing system (WPS) is a separate set of executables, that can be built only after WRF is successfully compiled. To run WPS for a real-case simulation, getting initial and boundary conditions from ECMWF-IFS data on model levels, you could use a script such as the following. However, the script depends on namelists, variable tables and other settings files being correctly specified. See the detailed info pages for details.
 
 ```sh title="Example: wrf-run-script.sh"
 #!/bin/bash
-- 
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