@CR
Rain or snow LAYERS are forecast by weather models.
A radar NEVER predict rain or snow. This tool is only able to visualise the current or past precipitations !
Radar doesn't see the future, just like your camera doesn't see the future.
Learn what is a radar
https://en.m.wikipedia.org/wiki/Weather_radar
If you want to see rain and snow reported by radars look at the Weather radar layer.