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Cloud Atlas ->
Altostratus Altostratus (As)
Description:
Dense, gray layer
cloud, often evenly and opaquely, which lets the
sun shine through only a little.
Origin:
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By rise of expanded air
layers into higher altitudes.
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From other clouds: From
Cirrostratus,
which increases; from
Altocumulus
with numerous ice crystal dragging (virga),
which gives it a monotonous appearance; from
Nimbostratus,
which decreases; from
Cumulonimbus
by propagation of the middle and upper frozen cloud sections at
inversions.
Possible cloud
species, subspecies and special forms:
|
species |
|
name |
shortcut |
meaning |
|
Altostratus undulatus |
As un |
with wave
formations |
|
Altostratus radiatus |
As ra |
Parallel stripes
of the cloud, which gathers apparently on the
horizon. |
|
Altostratus duplicatus |
As du |
Two or several
closely one above the other lying Altostraus
layers, which can partly grow together (dirty
weather!). |
|
Altostratus translucidus |
As tr |
Sun is to be
recognized weakly through the cloud cover. |
|
Altostratus opacus |
As op |
Sun or moon is
completely covered by the clouds. |
|
special forms |
|
name |
shortcut |
meaning |
|
Altostratus mamma |
As mam |
sac-like,
wart-like excrescences at the bottom side of the
cloud |
|
Altostratus virga |
As vir |
with drop strips |
|
Altostratus praecipitatio |
As pra |
With precipitation,
which reaches the ground. |
|
Altostratus pannus |
As pan |
With cloud
frazzles, which result in more deeply lying
turbulent layers from dampness enrichment from
evaporating precipitation. |
photos of Altostratus:
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|
Altostratus opacus |
Altostratus pannus |
Altostratus duplicatus |
Altostratus translucidus |
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Altostratus undulatus |
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other
Altostratus clouds: [1][2] |
