Noctilucent clouds are the highest clouds in the atmosphere and are only visible under specific conditions. Here we explore the strange clouds in more detail.
Noctilucent clouds were observed in parts of western US, Europe and Canada. The clouds consist of ice crystals that become visible when the sun is shining from blow the horizon.
Just before sunrise, a display of cool, blue appeared high above the horizon. But despite the Pacific Northwest's relentless bouts of rain this spring, these clouds were not a sign of wetter hours to come.
A pop-up dude ranch will appear at the historic OTO Ranch north of Yellowstone National Park this summer, allowing guests to stay at the property for the first time since
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