how to make thick polar clouds

@Luckwut ok

you can look at this planet terrain generation modifier
https://www.simplerockets.com/CelestialBodies/View/ofj35b/SpiralClouds
You can use other noise type, different remap value, different strength/frequency and whatnot.

So basically first you need to add Get position set to Y (i believe), then the data flow goes to remap (curve) with the remap goes like sine wave or something. Then add the remap (curve) with a noise using basic arithmetic (A + B), this is for detail (you can add many noise, if you want, but you need to connect those noise with another basic arithmetic). After those two data were added, add clamp and color blend. Give all of those modifier an EnabledWithSymbols = CUBEMAP