I’ve looked into this and haven’t really found anything that’s great, outside of using Home Assistant’s camera entity feature to pull the latest radar loop .gif from Weatherbug. A great non-foss app is Radar Omega. Some features do cost money but as a severe weather enthusiast I think it’s worth it.

Someone is developing an app called Supercell Wx. Works really well. https://github.com/dpaulat/supercell-wx