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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.
The first BBC weather forecast was a shipping forecast, broadcast on the radio on behalf of the Met Office on 14 November 1922, and the first daily weather forecast was broadcast on 26 March 1923. In 1936, the BBC experimented with the world's first televised weather maps, brought into practice in 1949 after World War II. The map filled the ...
Surface weather analysis is a special type of weather map that provides a view of weather elements over a geographical area at a specified time based on information from ground-based weather stations. [1] Weather maps are created by plotting or tracing the values of relevant quantities such as sea level pressure, temperature, and cloud cover ...
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The stations are listed in the order they are read in the forecast, the numbers in brackets refer to the map on the right. Weather reports included in the forecasts are issued at 2300 local time for the late broadcast and 0400 for the early one, although reports issued at other times may be included if for some reason, the most recent weather ...
This allows map users to analyze patterns in atmospheric pressure, temperature, wind speed and direction, cloud cover, precipitation, and other parameters. [1] The most common station plots depict surface weather observations although upper air plots at various mandatory levels are also frequently depicted.
Cloud cover values only vary by 3% from year-to-year averages, whereas the local, day-to-day variability in cloud amounts typically rises to 30% over the globe. Land is generally covered by 10-15% less cloud than the oceans, because the seas are covered with water, allowing for more evaporation .
A weather map, also known as synoptic weather chart, displays various meteorological features across a particular area at a particular point in time and has various symbols which all have specific meanings. [1] Such maps have been in use since the mid-19th century and are used for research and weather forecasting purposes.