I think parent is saying they DON'T see the rain shadow. I think it's perhaps a problem of opacity when you use the "mean annual depth" background layer. It's visible, but subtle.
I see what they are saying now. The use of the blue color bar tends to wash it out so it isn't as useful to "flood" the map view with blue water for this display as it would be if you changed to a color bar with other gradations that would allow the user to see at a glance that eastern Oregon is dry relative to coastal Oregon. A legend would also help.
