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accurate air-mass aircraft amount of water aneroid anticyclone atmospheric conditions balloons Beaufort letters BEAUFORT SCALE BEAUFORT WIND SCALE breeze British Isles causes changes CHAPTER Cirrostratus Cirrus cloud base cloud layer cold air cold front cooling Cumulonimbus Cumulus depression dew point drops of water dry-bulb earth earth's surface fall figures fog and mist freezing-point frequently frontal system give given ground-level groups hail haze heat height ice crystals inches instrument isobars mass of air meteoro Meteorological Office meteorological stations millibars movement number of days o-o o-o o-o observation occluded stage plotted polar air pressure systems radiation Rain-gauge readings reports Stevenson Screen Stratocumulus stratus cloud Sunshine recorder symbols Synoptic Chart temperature thermometer three hours thunderstorms tion usually varies vertical extent visibility warm front warm sector water vapour weather charts weather conditions weather forecasting weather maps weather station wind direction wind speed yards