My favorite for the radar imaging is an old app (last updated 5 years ago!) called Dual Radar. Still works on iPhone Xr with current iOS, but I don't know if it's a zombie app yet or will be soon. I've also got My Radar, Storm Tracker, Storm Radar, and NOAA Radar Live. All work fine as far as I can tell. Dual Radar has a nice simple interface and sharp-edged precip graphics that seem very accurate.