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Clear Sky Charts (called clocks until February 29, 2008) are web graphics which deliver weather forecasts designed specifically for astronomers. They forecast the cloud cover , transparency and astronomical seeing , parameters which are not forecast by civil or aviation forecasts. [ 1 ]
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). In addition, in the SYNOP code there is an extra cloud cover indicator '9' indicating that the sky is totally obscured (i.e. hidden from view), usually due to dense fog ...
Cloud cover (also known as cloudiness, cloudage, or cloud amount) refers to the fraction of the sky obscured by clouds on average when observed from a particular location. [2] Okta is the usual unit for measurement of the cloud cover.
An example meteogram showing plots of temperature, pressure, precipitation, cloud cover, wind speed and wind direction. A meteogram, also known as a meteorogram, [1] is a graphical presentation of one or more meteorological variables with respect to time, whether observed or forecast, for a particular location. [2]
The use of weather charts in a modern sense began in the middle portion of the 19th century in order to devise a theory on storm systems. [4] During the Crimean War a storm devastated the French fleet at Balaklava , and the French scientist Urbain Le Verrier was able to show that if a chronological map of the storm had been issued, the path it ...
The weather charts in some countries or regions mark troughs by a line. In the United States, a trough may be marked as a dashed line or bold line. In the UK, Hong Kong [ 1 ] and Fiji, [ 2 ] it is represented by a bold line extended from a low pressure center [ 3 ] or between two low pressure centers; [ 4 ] in Macau [ 5 ] and Australia, [ 6 ...