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The global cloud cover averages around 67-68%, though it ranges from 56% to 73% depending on the minimum optical depth considered (lower when optical depth is large, and higher when it is low, such that subvisible cirrus clouds are counted). [3] Average cloud cover is around 72% over the oceans, with low seasonal variation, and about 55% above ...
Cloud-cover symbols used on weather teleprinters and aviation reports in the US [6] In the early 20th century, it was common for weather maps to be hand drawn. The symbols for cloud cover on these maps, like the modern symbols, were drawn inside the circle marking the position of the weather station making the measurements.
Along with wind direction, cloud cover is one of the oldest atmospheric conditions to be coded on a station model. [ 7 ] [ 8 ] The circle in the middle of the station model represents cloud cover. In the United Kingdom , when the observation is taken from an automated weather observation site, the shape is a triangle. [ 10 ]
Cloud fraction is the portion of each pixel that is covered by clouds. Colors range from blue (no clouds) to white (totally cloudy). [106] (click for more detail) Although the local distribution of clouds can be significantly influenced by topography, the global prevalence of cloud cover in the troposphere tends to vary more by latitude.
A typical METAR contains data for the airport identifier, time of observation, wind direction and speed, visibility, current weather phenomena such as precipitation, cloud cover and heights, temperature, dew point, and barometric pressure. This information forms the body of the report, consisting a maximum of 11 groups of information.
Burlington, Vermont, is forecast to have 15% cloud cover on Monday afternoon. The city has 3 minutes, 19 seconds in totality during Monday's eclipse. Cleveland, which is supposed to get about 3 ...
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 ).
Cirrus cloud cover varies diurnally. During the day, cirrus cloud cover drops, and during the night, it increases. [14] Based on CALIPSO satellite data, cirrus covers an average of 31% to 32% of the Earth's surface. [15] Cirrus cloud cover varies wildly by location, with some parts of the tropics reaching up to 70% cirrus cloud cover.