Well it may not show up on radar, but it sure shows up at night VFR! as passenger on a United flight from Austin Texas to Chicago, after the lady captain had to wait 40 minutes or so for a routing to open up enough to avoid diversion, we approached Chicago in the most awesome weather I have ever seen....starlit night sky with stars, and to either side, towering cu lighting up ON THE INSIDE with flash after flash after flash.
ATC (we were listening to ATC as well in those days on United) said they could take ten approaches, and our gal spoke up; we were number eight, and duly descended in the clear as much as possible, closer and closer to the monsters, and eventually had to get wet. A bit gusty but nothing too bumpy at all. Just torrential rain, a safe splashdown, and it all passed over before the onward flight to London. I'll never forget that sky. Beautiful.