Rain stopped play

Can't really do much in this weather...
(Actually this is just a mock-up. I'm still pondering the implementation!)

OK, I'm really getting quite wet now, and I can't see much either!
I very much like this - you've just made your plan of attack and got your troops positioned when suddenly  - wham - rainstorm! Can't see a bloody thing!
I wonder if I can make this happen...