Hi all,
It took a few weeks but I finally came up with a really ugly Python script to convert my weather station's CWOP historical data in MesoWest's CSV format into WeatherCat data files. I used the Synoptic bulk download and that worked out real well. Converting MesoWest's precipitation data from accumulations since UTC midnight to a running year total for the local time zone was a nice puzzle to solve.
So should anyone need help importing their station CWOP data from MesoWest/Synoptic, please contact me and I'll be willing to share the script along with guidance for use.
So now I've got locally accessible historical weather data dating back to 2018 in WeatherCat! The software's stats are great!

Ryan