Just a guess off the top of my head, you would be to swap out the CF card with a CF card programmed for bad weather. Not automatic but it would work.
Unless you could use the trigger board with a rain detector(or a switch) that overrides you schedule with a weather schedule. But I have not used a trigger yet so I don't even know if thats possible.
Just my 2 cents and not a official DLA response

Rick R.