There's more to clouds than 'dull or grey' and 'white and fluffy': These incredible pictures show the variety of our sky constant wind may produce clouds which are stable and remain virtually stationary in the sky for long periods.
When viewed from the ground Shelf clouds appear as low, wedge shaped clouds and are usually associated with severe thunderstorms.
Cumulonimbus clouds rise vertically until they hit a natural barrier, known as the tropopause, which causes them to flatten out. They usually herald the onset of a severe storm.
Von Karman cloud vortices above Alexander Selkirk Island, Chile: In this picture these cloud vortices (swirls down the left) have been caused by the peak of Alexander Selkirk Island (bottom left) disrupting wind-blown clouds. This image was captured by the Enhanced Thematic Mapper Plus (ETM ) sensor on NASA's Landsat 7 satellite
Ethereal: Noctilucent clouds are crystals of ice hanging around 80km high in the atmosphere that catch the light of the sun long after it has set on the horizon. The cloud in this image was formed from the exhaust of a missile launched from a distant firing range
Supercell thunderstorm: Inside these severe long-lived storms the wind speed and direction changes with height. This produces a strong rotating updraft of warm air (a mesocyclone) as well as a separate downdraft of cold air. Around a third of supercells produce tornadoes and are termed tornadic
The physics of waves determines how some clouds behave. Vortices look like they have had a hole punched through them but in fact they are naturally occurring and are crafted by wind patterns.
Noctilucent clouds are crystals of ice hanging around 80 kilometres high in the atmosphere that catch the light of the sun long after it has set on the horizon.
Supercell thunderstorms rotate with immense energy, causing a strong updraft and severe weather including tornadoes, hail, heavy rain, lightning and heavy winds.
Gravity wave clouds over the Gulf
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