Not sure if this was posted before:
https://esriaustraliatechblog.wordpress.com/2023/02/15/rain-radar/
One of the most highly requested features for Web Maps has been to overlay the the Rain Radar and animate it.
Live demo: Preview Demo here
Video : https://www.youtube.com/watch?v=qSRovErKutw
Source Code: https://github.com/bgtdevhub/rainfall-radar-exb
more info : https://esriaustraliatechblog.wordpress.com/2023/02/15/rain-radar/
This widget does not clean up properly and the radar may come back after you close it. The animation works by quickly adding and removing layers to the map which looks awful in the Map Layers Widget. I think it has other issues as well. I have this widget in one Experience as something of a novelty, so I have never taken the time to try and de-bug it. The code contains numerous useEffect, useCallback and setTimeout functions so it may be tricky to fix it without breaking something else.
On the same site, there is also a great widget for viewing NearMap data. These two widgets do not work well together and will likely throw errors if activated in the same session.
https://esriaustraliatechblog.wordpress.com/2023/01/23/nearmap-arcgis-experience-builder-widget/