The bobbly clouds that make this image so startling are called mammatus clouds - a name derived from the Latin word for breast. They arise as the result of turbulence … Mammatus are pouch-like cloud structures and a rare example of clouds in sinking air. Photograph by: Manikin Sometimes very ominous in appearance, mammatus clouds are harmless and do not mean that a tornado is about to form; a commonly held misconception. This is the reason why this cloud is named as the mother of pearl clouds. Planes passing through the cloud layer can bring these ice crystals. Basically, because these clouds form in an area with high water/ice particles, they are heavy … Mammatus are unusually lumpy clouds that often form in association with large cumulonimbus clouds. The reason for the udder-like shape is not well understood, though there are several interesting theories. They hang under the main body of other clouds. The ice crystals form because this level is the coldest in the entire upper atmosphere; even the minute amounts of water vapour present in this thin, dry air freeze. High to mid level clouds, such as altocumulus, are often composed of tiny water droplets that are much colder than freezing, but have yet to freeze. Mammatus clouds are very gentle downdrafts, typically seen beneath the anvil or along the flanks of a thunderstorm, though they may also be occasionally seen under stratus and altostratus clouds. How do they form? Once the air rises, it follows the same process to form clouds as described above. These "supercooled" water droplets need a "reason" to freeze, which usually comes in the form of ice crystals. Mammatus clouds are pouch-like protrusions hanging from the undersides of clouds, usually thunderstorm anvil clouds but other types of clouds as well. But mammatus clouds "form downward" in sinking air. Noctilucent cloud, rare cloud form, probably composed of ice crystals and dust from meteor smoke, that occurs at a higher altitude than any other cloud form (about 82 km [50 miles]). See more ideas about Clouds, Beautiful nature, Scenery. Jul 1, 2020 - Explore Dennis Newton's board "Mammatus clouds", followed by 355 people on Pinterest. It is largely made up of ice crystals and despite its stunning appearance, nacreous cloud is a destructive cloud as it helps in destroying the ozone layer. Heavy mammatus – or ‘mammary’ – clouds were seen over Tulsa, Oklahoma, on April 28 after a severe tornado-warned storm swept through the city and surrounding counties. The types of clouds that form in this case are cumulonimbus (and associated mammatus clouds), and cumulus. Another way that mountains cause cloud formation is when air rises because the mountain is warmer than the surrounding air and causes the air to rise. Nacreous clouds are polar stratospheric clouds that have shiny, beautiful colors similar to those found in a seashell.