Word: clouded
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Dates: during 1940-1949
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...morning last week the cloud cover over northwest Germany thundered. Over the port of Emden a "pathfinder" squadron of Fortresses eased down from the overcast, planted incendiaries. Flames burst from Emden's factories, clocks, submarine repair shops...
...Most dangerous are the low, dark nimbostratus (because of its poor visibility and the danger of icing) and the stormy thunderhead, cumulonimbus. Also to be avoided: the wavy, handsome billow cloud-which gives a very billowy ride...
...Clouds have general upper and lower limits†: in middle latitudes the highest clouds are six or seven miles above sea level (because air gets no colder above that height); the lowest (except for fogs) are at about 2,000 ft. In thickness, a cloud may vary from a wafer (cirrus) to several miles (cumulonimbus...
...high, thin, wispy cirrus cloud and its relatives, the milky cirrostratus and ripply cirrocumulus, are ideal cover for high-altitude bombers: they provide a one-way screen that allows an airman to see his target but hides him from planes or groundlings below...
...Weather Bureau has just developed a photoelectric instrument, using a vertical beam of light and a phototube scanning the beam, which quickly measures cloud heights day or night by triangulation...