How to Photograph Rain

So it started to rain at lunch time and did not stop for the afternoon.  And when I say rain, I mean a heavy steady rain all afternoon.  I was trying to get a photo of the rain and the clouds in the mountains as they come down the mountain to dump the rain.  I need to work on it some more and try again.  The large white area in this photo is the clouds that were hanging over the mountains - blocking the view of the mountains.  It is amazing when the clouds ge tso thick you can't see anything in front of you.