This strange cloud shape that somewhat resembles what you might expect over a moutain, appear one day in Southeast Texas. You can see the winds making a circular ring around the cloud. Maybe I don't pay enough attention to clouds, but this was strange to me.
This is one of the outflows from the Prismatic Pool in Yellowstone National Park. The steam comes from water bubbling up from volcanic heat pumps deep in the earth's crust. The 640,00-year-old, 45-by-30 mile caldera formed from an eruption of the active volcano forms the center of the National Park. There are more than 10,000 hydrothermal features and 300 active geysers in the park. --steve buser