Mt. Rainier, Rainier National Park, Washington state, USA
Why are you reporting this puzzle?
The weather can change in ridiculously short time on the mountain. The day before this picture was taken, a few fluffy clouds, like the ones here, started showing up. Within thirty minutes, the entire mountain was gone from view, and in another thirty minutes the visitor's center and even the roads had visibility limited to about forty feet. Within another thirty minutes, the entire west half of the park was enveloped in white (probably the east half, too, but we were heading west).