Attached Link: White Stretched

Ok, here is another link.

Started from the same file but replaced the Smooth Step node with a Gaussian Tooth node in order to have clouds restricted to an area.
Also both branches are multiplied now, in order to have distinct boundaries. The map filter nodes serve to remap the values so they are suitable for multiplication and the map filter underneath the multiplication node remaps the values so they start at -1 (If they are too high or too low you may get unintended results, so it`s good to know that the cloud editor expects values between -1 and 1)

Made a couple of changes in the clouds editor, like setting all scale values to 1, as well as decreasing Opacity and Density in order to have bright clouds. The Altitude is set a lot higher.

The fractal node`s wavelength is set to 1/3/1 in order to get stretched clouds. The Multiply node above the fractal nodes serves to scale the clouds.

There have probably been some more changes. It`s best if you try to analyse yourself and then make the changes necessary. But I think this is quite a good approachthat may lead to the result you want.

Hope this helps :-)

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