Add section for dividing requirements for met files
Initialize booleans for different met file cases

Set all cases to FALSE when initializing.
Determine which met file case is TRUE
Get vector lists of met files for run

These are applicable to runs using the GDAS 1-degree
dataset. Trapping leap-year condition of missing
.w5 met file for February as a list value of ‘0’
(to be removed later).
Remove ‘0’ value from list of met files
Determine whether met files required are available

Checks the selected path of met files for file
existance. Creates a data frame with the results.
Construct the output filename string for model run
Write start year, month, day, hour to CONTROL file

This creates the CONTROL file in the selected
working directory.
Write number of starting locations to CONTROL file

Appends to existing CONTROL file.
Write starting lat/long and height to CONTROL file

Appends to existing CONTROL file.
Write direction and duration of model to CONTROL

Appends to existing CONTROL file.
Write vertical motion option to CONTROL file

Selected as a numbered option. These are currently
not documented. Appends to existing CONTROL file.
Write top of model domain to CONTROL file

This is an integer value in meters. Appends to
existing CONTROL file.