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Optical Effects
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Altocumulus lenticularis duplicatus spotted over the Alps Mountains, near Wagrain, Austria
A plethora of optical phenomena, inclusive of a 22-degree halo, sun dogs, an upper tangent arc, and a sun pillar that leads upwards towards signs of a faint and rare v-shaped Moilanen arc, spotted by John's friend, Natalie Tercek, at sunrise before a day of skiing at Mt. Hood Meadows, Oregon, US.
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Fluctus (Kelvin-Helmholtz) spotted over Mannheim, Germany
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Fallstreak Hole (Cavum) spotted over Conwy, North Wales
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Low-level layered stratus spotted over Mainz, Germany
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Nacreous spotted over Nesodden, Norway
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A classic example of pileus spotted over Curitiba, Brazil
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Stratus hugging the mountains in the Rhone Valley near Sion, Switzerland
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A cloudbow as seen from above, by way of an airplane that took off from Curitiba, Brazil
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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.
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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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