Been working on recreating the workflow from SkyCard with Unreal's new volumetric sky and atmosphere systems: Basically grab any cloud you want and move it, scale it, rotate it, or completely change it by choosing from a library of over 50 cloud volumes! What's more this workflows allows the use of complex shapes for atmospheric systems that traditional noise based approaches don't.
You can it out here:
https://www.unrealengine.com/marketplace/en-US/product/cloudscape-volumetric-cloud-library
See it action ;)