Pseudo volume cloud body hasfibreShape structure, usually white, without shadow, with a wool like luster, mostly in the shape of silk strip, sheet, feather, hook, ball, anvil, etc.Most of them areIce crystalform.
Pseudocirrus is a derivative of cumulonimbus.
Chinese name
Pseudo cirrus
Foreign name
Ci not
Genesis
Cumulonimbus cloudIt is formed after the top is separated from the main body
Color
white
Diameter
10-15um
Time of occurrence
Cumulonimbus disintegration and dissipation process
Pseudo cirrus cloudThe cloud body is large and thick, often in the form of anvil.yesCumulonimbus cloudThe top is separated from the main body.It is often seen in the process of cumulonimbus disintegration and dissipation.When the cumulonimbus cloud develops to the decay stage, the updraft in the cloud weakens, mainlyDowndraft, due to the lack of water vapor supply,Cumulonimbus cloudParent disintegrationthunderhead Some of them remain in the air and become pseudo cirrus clouds.[1]
Premonitory symbol
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Its appearance indicates that the atmosphere changes from instability to stability (when the anvil of cumulonimbus clouds extends far away, the station only sees the anvil part, but not its parent body. At this time, although the anvil looks like a pseudocirrus cloud, it is actually not a pseudocirrus, but a part of cumulonimbus clouds, so it does not meanConvective movementTends to weaken).Pseudocirrus clouds are large and denseIce crystalThe cloud is white or dark gray, and the middle part of the cloud is even. Only the edge of the cloud can see the silk structure. When blocking the sun, it can weaken the sunlight, or even completely disappear the sun.
Cirrus cloud
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Appearance characteristics
Cirrus clouds have a variety of shapes, often in the form of feathers, filaments or hooks, with fiber structure and silk like luster, and usually do not significantly weaken the sun and moon.It is usually white and light yellow in the sky.
CirrusCloud base heightGenerally, it is between 7000 and 10000 meters, and in summer, it can reach 17000 meters in the south;In winter, some areas in northern China can be as low as 4000 meters.The cloud thickness is generally 500~2500 meters.
Cirrus clouds, thin cloudsHazeLayer;Thick clouds are milky white.Through thin cirrus clouds, you can see the ground scenery or the cloud top of the lower layer of clouds.Trace cirrus clouds are usually difficult to detect.
Cloud structure
Because cirrus clouds appear at a higher height and lower temperature (usually - 20 ℃~- 50 ℃)Ice crystalform.Individual ones are composed of ice crystals and snowflakes.In addition, due to the low water vapor and high wind speed, the ice crystals in the cloud are sparse, and the cloud always has fiber structure.
Impact on flight
Cirrus clouds are composed of ice crystals, so they will not freeze when flying in the clouds. Due to the sparse ice crystals, the visibility in the clouds is good, usually hundreds of meters, sometimes up to 2000 meters. Multiple machine room formation flying can be carried out in the clouds, but just as Chairman Mao taught: "There are two contradictory meanings in one thing." Because the ice crystals in the clouds reflect and refract sunlight,Flying on or in clouds is dazzling.Flying in the clouds, sometimesradioThere is also interference.In addition, sometimes there are longitudinal turbulence, flying in or on cirrus clouds near the jet stream, and sometimes there are moderate turbulence.[2]
