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airship amount anemometer anticyclone atmosphere average balloon barometer Beaufort Scale blows called centre changes cirrus cirrus clouds cloud Coast convection cooled cubic metre cumulo-nimbus cumulus cyclonic density depression direction distance earth earth's surface eddy electric energy entropy equator Fahrenheit fall feet force freezing gale geostrophic geostrophic wind given gradient gramme ground halo heat height high pressure horizon humidity hydrogen hygrometer instrument inversion isobars isothermal katabatic wind Kew Observatory kilometres latitude layer light low pressure mean measured mercury Meteorological Office mi/hr miles millibars moon motion nautical miles normal North observations Observatory occurs particles period quantity radiation rain rainfall rays records region represented rise scale seasonal seen side snow sometimes South stations substance summer temperature thermometer thunderstorm trade winds upper air usually vapour variation velocity vertical visible warm water-vapour Weather Map winter