Storm Over the Tetons. This photograph was taken after a long morning hiking in the Tetons. Although we had great weather for our earlier explorations, a storm materialized mid-afternoon. It swept over us before yielding to the clearer skies seen in the distance. This reflects the ever-changing weather systems that surround mountains. (Teton National Park, August 2011.) Photograph by Jennifer K. Rossi, MD, Portland, Oregon.