@wndyjef rebooted and all is working. had tried this before but fixed the problem this time. It will remain a mystery

Using safari, MacOS 14.5, the following error message occurs when selecting weather radar layer
"It seems that radar failed. Radar uses webGL technology, that can occasionally fail on some devices.
What can you do? Update your browser or Windy application to the latest version. And try again please"

Been like this for a week or so. works on Chrome. Safari is updated.