hehe, I put it as a thread in the Wish list a couple of days ago.
Do this:
Create a custom arena with ndisles as the terrain. Go to the center V-base and look up. Wish granted... for about 15 min. Then you need to wait an hour for them to come back unless your respawn another arena.
They look really nice.
I've forgotten who posted it, but it was somewhere on the bbs Tues morning.
Oh, but as far as I can tell, you don't download the weather file for offline use when you do this.