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Optical Effects
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Nacreous clouds, forming at altitudes of 15-25 km (10–20 miles), up in the stratosphere, at temperatures of around -85˚C (-121˚F), these clouds show beautiful iridescent pastel hues as they scatter the light from the Sun when it is just below the horizon. Sometimes called ‘mother-of-pearl clouds’, their tiny, uniform ice crystals are very good at diffracting sunlight. This classic example was spotted in December of a prior year, over Nottingham Castle, Nottingham, England.
Distrail over Mt. Rainier, Washington, US
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Altocumulus lenticularis duplicatus spotted over the mountains, from the Missouri River near Wolf Creek, Montana, US
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Altocumulus lenticularis duplicatus accompanied by Mt. Rainier in a majestic pairing near Seattle, Washington, US
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Sun Pillar with Sun Dogs, being formed here as the sunlight is refracted by the ground level ice crystal cloud, diamond dust, over the Adirondack Mountains in Vermontville, New York, US.
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A cloud blanket over Nanton, Taiwan.
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A sea of Stratus over Hunter Valley, Australia.
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A sea of clouds in the mountains of Taiwan.
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A sea of stratus over Ostra, Marche, Italy.
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A sea of stratus over Nantou, Taiwan.
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Kelvin-Helmholtz waves over LaGuardia in Northern Spain.
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A cloud 'duvet' on the peaks near the Flathead River, Charlo Montana, US.
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A scarf-like formation wrapped around the peaks of Clarkston, Idaho, US.
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Rivers of clouds sweep through the Olympic Mountains in Washington state, US.
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The peak of Aiguille du Midi on the Mont Blanc massif, emerging from the surrounding clouds.
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A sea of Stratus over the volcano Fuego, Guatemala.
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