Had that happen in an MD80 in the 90's. Going from DFW to east coast saw weather ahead and couldn't see it on the radar. When we entered the clouds we got heavy precip. so adviced center that our radar wasn't showing what we were encountering and if they could suggest a heading. They said well, since you are in the middle of it now it doesn't matter. We got the radar back as we descended below 10,000 and checked the nose cone after landing and found It heavily pitted from previous damage. We wrote up what we found and they replaced the nose cone. Attenuation from ice forming was the problem.