The bottom falls out. I'm thinking about the hikers that I saw entering the 4 mile trail that I was leaving just a half hour before I took this picture. At the time, it was an innocent sprinkle which felt nice on a warm day. Storms seem to roll in faster in the desert. Once I realized that this black cloud racing towards us was producing lightning strikes it was a race to find the highest and most exposed location in the park, to take pictures of course. I've always wanted to try taking a picture of lightning but in Raleigh and most other places with a healthy tree population you just see bits and pieces of storms. In the desert you can view the entire thing as a single entity and really get a sense of how close it is.