Rainbows at sunrise

Just after the sun rose this morning and while I was on my usual Wednesday morning run, this lovely rainbow appeared and hung around for a good 10 minutes or so. Of course, I only had my phone with me again, so this is a phone panorama. I tried the in-built camera panorama mode, but it didn't seem able to join the arc smoothly. AutoStitch works well, but makes tiny little files, so I used PhotoShop. It has compressed the rainbow somewhat – the curve isn't very natural looking any more!

(The clouds really were this peachy colour.)