Hello. I hope this is okay to post, but have you looked at S2Engine HD?
The reason I bring up this engine is because it handles water, weather, and day/night cycles really well. It's easy to manipulate and change any of this and even animate things (the day/night cycle). Personally, I don't think the engine is as graphically nice as Skyline (and the UI is a bit of a mess in some ways), but these particular features are very nice, in my opinion.
Now, I have little experience with Skyline (waiting for the next release to purchase, to be frank, due to the GUI changes), so perhaps you have similar tools. If not, it might be worth taking a look.
Also, the S2Engine's FSM (Finite State Machine) form of visual programming is pretty interesting, too.
If this sort of post is not allowed, then please remove it. I am not bringing up a competing engine to say it's better. Quite the contrary. I simply wanted to point out a few features that I found interesting. I hope that's okay.
Thanks.