The AH1 editor will not work for AH2 terrains.
I don't know what HT's plans are for the cloud editor but here is an example of the new format:
72,3600,30,132000,1000,8,8,100,100,1000,1000,1000,3000,3000,3000,0,15000,0,132000,0,0,422928,0,0,0.500
0,10188,20,121440,2000,10,16,2,4,5000,3000,5000,7000,5000,7000,-179520,8000,547800,1320,0,-252120,66515,0,1330,1.000
6408,6408,20,182688,4000,10,16,3,4,7000,3000,7000,9000,5000,9000,476520,10000,92400,36960,0,-158400,87120,0,76560,1.000
Each "group" would be on a single line and covers a single cloud front -- the above lines are word wrapping. Three fronts are shown above. You can edit them using any text editor. It would be very difficult to work with the text from scratch; but if this is something you want to try, I could describe the fields.