AH3 beta's clouds do not seem to work correctly. The types mostly result in a solid layer of cloud (not much variability and no spacing between the individual clouds in a front), and there are non-random, periodic features in placement of the individual clouds in a front.
I created cloud fronts as follows and looked at them in AH2 and AH3 beta. The following picture shows how I set that up. In this example, I created one particular front (front 8) that starts about 1.5 rows down from the top of the map and travels north. It is all type 1 clouds, all at 5000 ft, with transparency 0.9. The speed is set unrealistically high (500 mph) just so that when I test them, I don't have to wait forever for them to develop. This causes no problems -- you just see the cloud front progressing quickly.
I created this front starting with type 0 clouds, loading it into and looking at in AH3 beta, then making it type 1, looking at it, and so on for all the cloud types.
In the following, this is what such fronts look like with a picture of the AH2 cloud type first, then a picture of what a front of the same cloud type in AH3 beta looks like. Note that AH3 beta clouds are generally all packed together, with no spacing between them, unlike in AH2. I look at that them from above, then the whole set from below.
