Island in the Sky, Canyonlands National Park, Utah
The forecast mentioned late afternoon clouds, but I was not expecting a storm front to sweep in. When I stopped at the Holeman Spring Canyon overlook an hour earlier, these were faintly distant clouds. Then the sky began to darken and a wind came up as the front moved in. At this moment I was still standing in sunlight (note the juniper tree's shadow in the foreground), as the front was almost over top of me.
Explored May 18, 2017