Its precipitation. Precipitation is concentrated in the clouds. Of course it can be turned into a white approximation of a cloud.
There is no color associated with radar returns. Any color is an enhancement for visual. Doppler weather radars are not imaging clouds. They are getting returns from precipitation. The graphics produced from doppler radar are after effects, coded for visual displays by severity (light, heavy, etc.) There are certainly clouds where there is snow or rain, even if it's not reaching the earth's surface, but no video or photographic images are being produced from radar returns. It's just not happening. It's a fiction. You're either making it up or you've let yourself be mistaken.
You started by talking about OTH radar. Which is totally not true. Completely different radar technique and system. Then you introduced doppler, which is STILL not a technique that can produce the kind of earth atmosphere environmental images that SpaceX or anyone can computer-graphically project into the background of a fake space scene. Just simply, flat out, is not possible today. That's not what radar does.
Again, you were not there. You don't know what the clouds truly and exactly looked like. We are just seeing the 'clouds' compared in one government sponsored project (SpaceX) compared to the 'clouds' from another government source.
I don't care. Whatever alternative you want to conjure up to satellite imagery, it's not from radar.