With the addition of selecting specific areas of a map to show / hide effects is a great idea. Apart from weather, I like to use the effects to create moving water and although I can get by with using the ocean effect to create realistic north/south moving water, it does not work well when applying it to a east/west river. I am hoping that and addition of direction can be added to the effect so the flow can move depending on the direction of a river.
That is unless there is another way of doing it with the existing tools. thanks.