Updating fire section of users guide for new options

Author: mkavulich

doc/UsersGuide/BuildingRunningTesting/FIRE.rst

@@ -98,6 +98,14 @@ The fire module has the ability to print out additional messages to the log file
    fire:
      FIRE_PRINT_MSG: 1
 
+The fire module now supports OpenMP parallelization. By default, parallelization is off, but it can be enabled by setting ``OMP_NUM_THREADS_FIRE`` to a value greater than 1. In testing we have observed a 10-25% speedup with ``OMP_NUM_THREADS_FIRE: 2`` vs 1, with only marginal additional speedup for ``OMP_NUM_THREADS_FIRE>2``.
+
+.. code-block:: console
+   
+   fire:
+     OMP_NUM_THREADS_FIRE: 2
+
+
 Additional boundary conditions file
 -----------------------------------
 
@@ -148,6 +156,8 @@ In this case, a single fire (``FIRE_NUM_IGNITIONS: 1``) of radius 250 meters (``
 
 The CFBM creates output files in :term:`netCDF` format, with the naming scheme ``fire_output_YYYY-MM-DD_hh:mm:ss.nc``. In this case the output files are written every 30 minutes (``OUTPUT_DT_FIRE: 1800``).
 
+Users can also modify the wind profile used in the CFBM with the setting ``WIND_VINTERP_OPT``. By default, the full prognostic wind field from the atmospheric model is used to calculate a wind profile for spreading the fire. Setting ``WIND_VINTERP_OPT: 1`` changes this to use only the diagnostic 10m wind, which is less compute-intensive and therefore runs faster.
+
 .. note::
 
   Any of the settings under :fire-ug:`the &fire section of the namelist <Configuration.html#fire>` can be specified in the SRW App ``config.yaml`` file under the ``fire:`` section, not just the settings described above. However, any additional settings from ``namelist.fire`` will need to be added to ``config_defaults.yaml`` first; otherwise the check for valid SRW options will fail.