Dr. Brian Heckman- Doctor James Noel Foundation ( DJNF) Seasonal Weather Pattern Shifts, Clouds and Weather Science in Rocky Mountain National Park Learn about observing clouds, precipitation, and the many optical phenomena ( rainbows and more) that visitors to the Park often see. Some of the most interesting clouds are the various stages of cumulus, the pileus cloud, and the beautiful lenticular or wave cloud. During the summer months the cumulus cloud, especially the stages of developing into a thunderstorm are very important for your safety. We'll discuss how you can use your observation skills to better guide against potential danger.