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This will give the altitude of the cloud base in feet above ground level. Put in a simpler way, 400 feet for every 1°C dew point spread. For metric divide the spread in °C by 8 and multiply by 1000 and get the cloud base in meters. Add the results from step (2) to the field elevation to obtain the altitude of the cloud base above mean sea level.
Cloud chart showing major tropospheric cloud types identified by standard two-letter abbreviations and grouped by altitude and form. See table below for full names and classification. The table that follows is very broad in scope much like the cloud genera template near the bottom of the article and upon which this table is partly based.
The base-height range for each level varies depending on the latitudinal geographical zone. [7] Each altitude level comprises two or three genus-types differentiated mainly by physical form. [41] [5] The standard levels and genus-types are summarised below in approximate descending order of the altitude at which each is normally based. [42]
Although clouds can exist within a wide range of altitudes, typical cloud cover has a base at approximately 4,000m and extends up to an altitude of about 5,000m. [9] Clouds height can vary depending on latitude; with cloud cover in polar latitudes being slightly lower and in tropical regions the cloud cover may extend up to 8,000m.
The cloud height, more commonly known as cloud thickness or depth, is the distance between the cloud base and the cloud top. [1] It is traditionally expressed either in metres or as a pressure difference in hectopascal (hPa, equivalent to millibar ).
The CCL is determined by plotting the dew point (100%RH) versus altitude and locating the intersection with the actual measured temperature sounding. It marks where the cloud base begins when air is heated from below to the convective temperature, without mechanical lift. [1]
Tuba: column hanging from the cloud base which can develop into a funnel cloud or tornado. They are known to drop very low, sometimes just 6 metres (20 ft) above ground level. [7] Flanking line is a line of small cumulonimbus or cumulus generally associated with severe thunderstorms.
Resembling an aircraft carrier, complete with flight deck and powered by jet engines, Cloudbase hovers at a fixed altitude of 40,000 feet (7.6 mi; 12 km). Though usually geostationary , it is equipped with horizontal jet thrusters that enable it to be moved to any point above the Earth's surface.