How to Predict Rainbows and Plan Photographs

Here&rsquo;s a recent photo I made of a rainbow above San Diego&rsquo;s downtown. I&rsquo;ve been trying to get this image for a while now, probably a year or more. But I always kept missing. I would go to a spot where I thought a rainbow would appear and wait but I had no success. Rainbows are difficult to photograph in San Diego because it doesn&rsquo;t rain much and when it does rain you need…