WebNacreous clouds, also known as “mother-of-pearl clouds” or “polar stratospheric clouds”, are a rare type of cloud best known for their vivid and sometimes luminous colours. Almost all clouds form in the troposphere, which typically extends 10-15km (6-9 miles) in altitude. WebA Morning Glory cloud is a roll cloud, or arcus cloud, that can be up to 1,000 kilometres (620 mi) long, [2] 1 to 2 kilometres (0.62 to 1.24 mi) high, often only 100 to 200 metres (330 to 660 ft) above the ground. The cloud often travels at the rate of 10 to 20 metres per second. [3] Sometimes there is only one cloud, sometimes there are up to ...

Nacreous clouds - Met Office

Webdensities tend to be larger when clouds are formed rapidly (as in mountain wave clouds), and smaller when clouds are formed slowly (Toon et al., 1989; Hu et al., 2002). This is because, in clouds formed by slow cooling, supersatu-ration ratios are relatively low, and freezing occurs prefer-entially among aerosols that largely consist of ... WebNon-vertical clouds in the middle level are prefixed by the alto. At any latitude, these clouds are formed as low as 2000 m (6500 ft) above the surface. These clouds can be formed as high as 4,000 m (13,000 ft) near the poles. These clouds are formed at an altitude of 7,600 m (25,000 ft) in the tropical region. dvd lernkurs hands on soundcraft ui mixer

Nasa Ozone Watch: Ozone hole facts

WebThe WMO International Cloud Atlas is the reference for the classification of clouds and meteorological meteors. It provides the definitions and descriptions of cloud types and meteors, and flow charts to help identify them. WebPolar stratospheric clouds (PSCs) and ozone Under normal atmospheric conditions, the two chemicals that store most atmospheric chlorine (hydrochloric acid, and chlorine nitrate) are stable. But in the long … WebIce polar stratospheric clouds (nacreous clouds) form at temperatures below the ice frost point, typically near −85 °C, which is colder than the average lower stratosphere … dvd lens cleaner india