A Met Office video explains seven rare cloud types - including noctilucent clouds as they’re sighted in the UK.

These noctilucent clouds are rare and often occur during the summer months. ... The ice-blue clouds form 50 miles above the ground in a layer of our atmosphere known as the mesosphere.

Noctilucent clouds form in the mesosphere, a layer of Earth's atmosphere about 22 miles (35 kilometers) thick. According to NASA, summer in the Northern and Southern Hemisphere is when the ...

The water in noctilucent clouds is either transported up into the mesosphere from the lower atmosphere, or forms when methane in the mesosphere breaks down by absorbing the sun’s rays.

Noctilucent clouds are the only type that that form at altitudes as high as the upper mesosphere, typically taking shape at heights of about 50 miles (80 kilometers).

Aurora chaser and photographer Harlan Thomas ( @TheAuroraGuy) was about 18.5 miles (30 kilometers) north of Calgary along a rural stretch he calls "The Twisted Pond Road" when the surprise display of ...

Noctilucent clouds are the highest of all, with altitudes between 249,000 and 279,000 feet ... They're so lofty they form far above the troposphere in a layer called the mesosphere.

Noctilucent clouds form in the mesosphere, the third layer of the atmosphere. The mesosphere ranges from around 30 to 53 miles above the surface of the Earth, according to the National Oceanic and ...

Noctilucent clouds literally take it to a different level. These clouds form in the third layer of the atmosphere, known as the mesosphere. This layer is at altitudes between 47-53 miles above ...

A fantastic photograph shows noctilucent clouds over Edinburgh.Sachiko Hamada caught the stunning space phenomenon at 2:10am ...