Welp, this is strange.
The menu icon wasn't available - until I found some other post which had me append /menu to the link.
I was successfully able to set my parameters as I wished that way.
It's still flaky, but now that I have it formatted to show me degrees, it's not an issue.
The current page I have shows a query in the URL string, which had not been there before: https://www.windy.com/?gfs,26.998,-79.126,10,m:epQadVP
No idea how it arrived there, but my page looks as I had become accustomed to, and all is again well.