the AH1 Cloud editor had 4 settings for clouds, 0,1,2 and heavy cloud cover. The ones I have seen in AH2 are definately not the large storm blocks, because there are multiple clouds moving together. The large dark block moves by itself and has no breaks. Thats how it was in AH1, I dont know what they might have changed though.
I personally like the new clouds I have seen:aok