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All-Weather Airfield
All-weather airfields are terms used to describe a runway, that is operable in all conditions of weather such as rain and support low visibility. The term was commonly used during the European and Pacific theaters of World War II. History of all-weather runways By the end of the 1920s, most major cities in the United States had built airports with paved all-weather runways. These airfields consisted of control towers and radio equipment under federal guidance. During the invasion of France on D-day, adequate meteorology was required to be recorded prior to air-raids. British and U.S. forecasters predicted a window of brief fair in the English Channel in which the Allied forces attacked. As the war progressed towards the Philippine islands, a mobilisation of boats and planes was required which was susceptible to typhoons and monsoon. By 1945, the United States Army Air Forces constructed 900 weather stations, of which more than 600 were stationed outside the United States. Weather ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rain
Rain is a form of precipitation where water drop (liquid), droplets that have condensation, condensed from Water vapor#In Earth's atmosphere, atmospheric water vapor fall under gravity. Rain is a major component of the water cycle and is responsible for depositing most of the fresh water on the Earth. It provides water for hydroelectricity, hydroelectric power plants, crop irrigation, and suitable conditions for many types of ecosystems. The major cause of rain production is moisture moving along three-dimensional zones of temperature and moisture contrasts known as weather fronts. If enough moisture and upward motion is present, precipitation falls from convection, convective clouds (those with strong upward vertical motion) such as cumulonimbus (thunder clouds) which can organize into narrow rainbands. In mountainous areas, heavy precipitation is possible where upslope flow is maximized within windward sides of the terrain at elevation which forces moist air to condense and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
