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The height above the ground or water of the base of the lowest layer of cloud below 6000 meters (20,000 feet) covering more than half the sky. [2] United Kingdom The vertical distance from the elevation of an aerodrome to the lowest part of any cloud visible from the aerodrome which is sufficient to obscure more than half of the sky. [3] United ...
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. Sky conditions are estimated in terms of how many eighths of the sky are covered in cloud , ranging from 0 oktas (completely clear sky) through to 8 oktas (completely overcast ).
CAVOK is an abbreviation for Ceiling And Visibility OK, indicating no cloud below 5,000 ft (1,500 m) or the highest minimum sector altitude and no cumulonimbus or towering cumulus at any level, a visibility of 10 km (6 mi) or more and no significant weather change.
The advantage of MOS forecast guidance as developed in the United States allowed for the removal of NWP model bias, prediction of weather elements not forecast by the NWP model, e.g., surface visibilities, cloud ceiling heights, reliable probabilities of binary events, e.g. probability of precipitation and (severe) thunderstorms,
A sky half full of clouds would have a circle that was half white and half black. Below the shape indicating sky cover, the station model can indicate the coverage of low clouds, in oktas, and the ceiling height in hundreds of feet. The ceiling height is the height at which more than half the sky is covered by clouds.
Although weather forecasts and warnings are the best known products of meteorologists for the ... ceilometer (cloud ceiling), falling precipitation sensor, flood ...
A cloud base (or the base of the cloud) is the lowest altitude of the visible portion of a cloud. It is traditionally expressed either in metres or feet above mean sea level or above a planetary surface, or as the pressure level corresponding to this altitude in hectopascals (hPa, equivalent to the millibar ).
NOAA continental US weather forecast map for November 7, 2006. Ceiling balloon – a balloon, with a known ascent rate, used to measure the height of the base of clouds during daylight; Ceiling projector – a device that is used, in conjunction with an alidade, to measure the height of the base of clouds; Ceilometer – a device that uses a ...
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