Cumulus Clouds
Cumulus clouds are puffy clouds that sometimes look like
pieces of floating cotton. The base of each cloud is often flat and may be only
1000 m (330 ft) above the ground. The top of the cloud has rounded towers. When
the top of the cumulus resembles the head of a cauliflower, it is called
cumulus congestus or towering cumulus. These clouds grow upward, and they can
develop into a giant cumulonimbus, which is a thunderstorm cloud.
Here are some examples of cumulus clouds:
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Cumulonimbus clouds
are thunderstorm clouds that form if cumulus congestus clouds continue
to grow vertically. Their dark bases may be no more than 300 m (1000 ft)
above the Earth's surface. Their tops may extend upward to over 12,000
m (39,000 ft). Tremendous amounts of energy are released by the condensation
of water vapor within a cumulonimbus. Lightning, thunder, and even violent
tornadoes are associated with the cumulonimbus.
Here are some examples of cumulonimbus clouds:
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Stratus Clouds
Stratus
clouds are uniform grayish clouds that often cover the
entire sky. They resemble fog that does not reach the ground. Usually no
precipitation falls from stratus clouds, but sometimes they may drizzle. When a
thick fog "lifts," the resulting clouds are low stratus.
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Nimbostratus
clouds form a dark gray, "wet" looking cloudy
layer associated with continuously falling rain or snow. They often produce
precipitation that is usually light to moderate.
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"Alto" Clouds
Clouds
with the prefix "alto" are middle level clouds that have bases
between 2000 and 7000 m (6500 to 23,000 ft.).
Altocumulus clouds are middle level clouds that are made of water droplets and appear as gray, puffy masses, sometimes rolled out in parallel waves or bands. The appearance of these clouds on a warm, humid summer morning often means thunderstorms may occur by late afternoon.
Here are some examples of altocumulus clouds:
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Altostratus clouds are gray or blue-gray
middle level clouds composed of ice crystals and water droplets. These clouds
usually cover the entire sky. In the thinner areas of the cloud, the sun may be
dimly visible as a round disk. Altostratus clouds often form ahead of storms
that will produce continuous precipitation.
Here are
some examples of altostratus clouds:
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Cirrus Clouds
Cirrus
clouds are thin, wispy clouds blown by high winds into long
streamers. They are considered "high clouds" forming above 6000 m
(20,000 ft). Cirrus clouds usually move across the sky from west to east. They
generally mean fair to pleasant weather.
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Cirrostratus
clouds are thin, sheetlike high clouds that often cover the
entire sky. They are so thin that the sun and moon can be seen through them.
Here are some examples of cirrostratus clouds:
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Cirrocumulus
clouds appear as small, rounded white puffs. The small
ripples in the cirrocumulus sometimes resemble the scales of a fish. A sky with
cirrocumulus clouds is sometimes referred to as a "mackerel sky."
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