1) Cloud 2) Cumulonimbus cloud 3) Thundercloud
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https://www.crosswordclues.com/clue/cumulonimbus
1) Thundercloud
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https://www.crosswordclues.com/clue/cumulonimbus
(Cb) A principal cloud type (cloud genus) of vertical development. Exceptionally dense and vertically developed clouds, occurring either as isolated clouds or as a line or wall of clouds with separated upper portions. These clouds appear as mountains or huge towers, at least a part of the upper portions of which are usually smooth, fibrous, or stri...
Found on
http://nsidc.org/arcticmet/glossary/cumulonimbus.html
(from the article `cloud`) ...to 6,500 feet), are altocumulus and altostratus. Low clouds, 2 to 0 km (6,500 to 0 feet), are stratocumulus, stratus, and nimbostratus. A cloud ... d. Cumulonimbus...Coriolis effect ( Relationship of wind to pressure and governing forces). The converging, moist oncoming stream becomes unstable over the hot ...
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http://www.britannica.com/eb/a-z/c/169
sometimes called thundercloud. The largest single cloud in the sky and can have a base of 2000 feet and tops of 40000 feet in temperate latitudes and even larger in the tropics.
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http://www.metcheck.com/OTHER/glossary.asp
A principal cloud type, dense and vertically developed, which produces heavy precipitation. It features an anvil shape on top and a dark base.
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http://www.stormfax.com/wxwords.htm
[
n] - a dark cloud of great vertical extent charged with electricity
Found on
http://www.webdictionary.co.uk/definition.php?query=cumulonimbus
a principal cloud type (cloud genus) of vertical development, exceptionally dense and vertically developed clouds, occurring either as isolated clouds or as a line or wall of clouds with separated upper portions; these clouds appear as mountains or huge towers, at least a part of the upper portions of which are usually smooth, fibrous, or striated,...
Found on
https://nsidc.org/cryosphere/glossary?page=5
a towering vertical cloud which usually results in a thunderstorm
Found on
https://sciencetrek.org/sciencetrek/topics/weather/glossary.cfm
cumulonimbus cloud noun a dark cloud of great vertical extent charged with electricity; associated with thunderstorms
Found on
https://www.encyclo.co.uk/local/20974
a cloud of a class indicative of thunderstorm conditions, characterized by large, dense towers that often reach altitudes of 30,000 ft. (9000 m) or more, cumuliform except for their tops, which appear fibrous because of the presence of ice crystals: occurs as a single cloud or as a group with merged bases and separate tops. Also called
Found on
https://www.infoplease.com/dictionary/cumulonimbus
No exact match found.
