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Nacreous clouds are located in the stratosphere between 9 and 16 miles high. Their “mother of pearl” colors come from sunlight striking tiny ice crystals inside the clouds. Very low temperatures near -85 degrees C are required to form the crystals, which is why nacreous clouds are seen mainly during winter over places like Alaska, Iceland and Scandinavia.

Nacreous clouds are located in the stratosphere between 9 and 16 miles high. Their “mother of pearl” colors come from sunlight striking tiny ice crystals inside the clouds. Very low temperatures near -85 degrees C are required to form the crystals, which is why nacreous clouds are seen mainly during winter over places like Alaska, Iceland and Scandinavia.

Strange Clouds Sighted over the Poles

Strange Clouds

Strange Clouds Sighted over the Poles

a "Sundog," happens when ice crystals appear in clouds and refract the sun's rays.

a "Sundog," happens when ice crystals appear in clouds and refract the sun's rays.

Unusual Weather Phenomena: Punch Hole Clouds

Unusual Weather Phenomena: Punch Hole Clouds

aurora borealis ... Wow

aurora borealis ... Wow

Unbelievable sky. (No credit given)

Unbelievable sky. (No credit given)

Sometimes this phenomenon is mislabeled as "Northern Lights", but mother-of-pearl clouds are known as nacreous clouds. They form at high altitudes- 15 miles above sea level, so even after the sun has set, the clouds are high enough to still be illuminated by the sun. They are commonly seen in the polar regions, but this image was captured in Colorado by Richard Hahn.

Sometimes this phenomenon is mislabeled as "Northern Lights", but mother-of-pearl clouds are known as nacreous clouds. They form at high altitudes- 15 miles above sea level, so even after the sun has set, the clouds are high enough to still be illuminated by the sun. They are commonly seen in the polar regions, but this image was captured in Colorado by Richard Hahn.

The clouds are usually seen over Norway and other polar regions, when the sun is just below the horizon. Here, birds fly near Whitley Bay in Northumberland, below the nacreous clouds on the coastline. It is thought that recent storms may have increased the chances of the clouds forming over the UK, by driving moisture up into the stratosphere.

'Rainbow clouds' captured on camera

The clouds are usually seen over Norway and other polar regions, when the sun is just below the horizon. Here, birds fly near Whitley Bay in Northumberland, below the nacreous clouds on the coastline. It is thought that recent storms may have increased the chances of the clouds forming over the UK, by driving moisture up into the stratosphere.

Mother-of-Pearl Clouds

Mother-of-Pearl Clouds

Северное сияние.

Северное сияние.

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