instructions to copy WRF run dirs

WRF.md

@@ -33,9 +33,15 @@ WRF and related programs run as executables on linux machines and clusters. Runn
 
 If someone else already compiled it on the computer you'll be working with, you just need to:
 
-* copy their WRF run directory.
+* Copy their WRF run directory. For instance on `srvx1`, some WRF run directories are available in `/users/staff/serafin/RUN`. You can get one with, for instance:
 
-* replicate exactly their compilation and runtime environment.
+    ```sh
+    cp -rL /users/staff/serafin/RUN/WRFv4.4.2_scm/ .
+    ```
+
+* Replicate exactly their compilation and runtime environment (see the chapter on "Setting up your environment" below).
+
+For instance
 
 ### Option 2: Get the source code