The weather was insane...there was a wind blowing, around maybe like 40-50mph, and the rain was crazy. It is really not that obvious with the pictures but it was nuts. So I just stayed for a while in the patio to wait the rain out. I then went out again to take another shot. This time, the light has changed dramatically within minutes. I took a couple of shots and I got one that was so much different than the last shot I did.
The rainbow shots were all done hand held. No time to go back inside the house to grab a tripod. Although it would have been nicer as I could have used a narrower aperture for a sharper shot, but I'd rather get the shot right there instead of messing around with my equipment. That was why the 17-40L is a very wise decision for that on the spot scenic shot.
I guess I was in that crazy time zone in the afternoon where light dramatically changes. Which is also the perfect time to snap a couple of shots. I was so lucky to capture the rainbow right in front of me, it was the perfect timing for everything.
The storm finally stopped and it left a very nice cloud formation west of where I was standing. So I took shots of the clouds with the silhouettes of trees bordering the image.