Problem solved. There are multiple MMM-OpenWeatherForecast repositories. The one I cloned for the new system was not the clone I was previously using. I changed to the module from Tom-Hirschberger/MMM-OpenWeatherForecast and everything began working as expected.
I apologize for my error.
Update: To prevent future issues, I have add a comment in config/config.js file on each module statement to remind me of the module repository location. The comment appears as: // github.com/Tom-Hirschberger/MMM-OpenWeatherForecast.
Butch Kemper