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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.
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.
5 km flight visibility, 1500 m horizontally from cloud, 1000 ft (300m) vertically from cloud. At or below 3,000 ft: 5 km flight visibility, clear of cloud and in sight of the surface or, for an aircraft, other than a helicopter, operating at 140 kt or less: 1,500 m flight visibility, clear of cloud and in sight of the surface For helicopters:
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).
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 ...
When clouds block out the sun but not the entire sky, it can result in beams of light known as crepuscular rays. Many people have seen a rainbow arch across the sky, creating a ribbon of colors as ...
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Scale of cloud cover measured in oktas (eighths) with the meteorological symbol for each okta. In meteorology, an okta is a unit of measurement used to describe the amount of cloud cover at any given location such as a weather station.