In order to use the GrADS tools, you will need the GrADS fonts and maps data sets
and may need to set some environment variables. For more information, see:
http://cola.gmu.edu/grads/downloads.php
grads is built for Intel macOS and requires Rosetta 2 on Apple Silicon.
Install Rosetta 2 with softwareupdate --install-rosetta --agree-to-license.
Rosetta 2 is difficult to remove once installed.