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Fractus clouds, also called fractostratus or fractocumulus, [1] are small, ragged cloud fragments that are usually found under an ambient cloud base. They form or have broken off from a larger cloud, and are generally sheared by strong winds , giving them a jagged, shredded appearance.
In aviation, ceiling is a measurement of the height of the base of the lowest clouds (not to be confused with cloud base which has a specific definition) that cover more than half of the sky (more than 4 oktas) relative to the ground.
Weather at Lambert Field in St. Louis was poor, with rain, snow, and fog, broken clouds at 800 ft (240 m) and a cloud ceiling of 1,500 ft (460 m), requiring an instrument approach. When the two aircraft emerged below the clouds shortly before 9 am, both pilots realized that they had missed the outer marker and overshot the runway. [3]
Low, ragged clouds that appear beneath the main cloud base. Formed from moist air lifted by outflow winds from a storm. Often mistaken for tornadoes, but they are typically harmless, indicating ...
BKN022 indicates a broken (over half the sky) cloud layer with its base at 2,200 ft (670 m) above ground level (AGL). The lowest "BKN" or "OVC" layer specifies the cloud ceiling . OVC050 indicates an unbroken cloud layer (overcast) with its base at 5,000 ft (1,500 m) above ground level (AGL).
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On April 28 the plan was changed; the entire assault force would be inserted by parachute drop at night in one lift, with gliders providing reinforcement during the day. The Germans, who had neglected to fortify Normandy, began constructing defenses and obstacles against airborne assault in the Cotentin, including specifically the planned drop ...
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