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500 millibar adiabatic lapse rate ahead air currents air pressure air rises aircraft altocumulus ascending balloon barometer becomes British Isles bubbles changes Chapter cirrus clouds cloud droplets cold air mass cold front condensation contour chart contour lines cool cumulonimbus cloud cumulus cloud decreases depressions and anticyclones descending air differences direction earth equator forecasting offices free atmosphere geostrophic wind ground heat height hills hygrometer ice crystals jet stream known latitudes layer less long waves low pressure map of isobars mercury meteorologists miles motion nimbostratus observations occlusion occur Plate plotted polar regions position prebaratic chart radar radiosonde ring of air saturated sea level seen showers stations stratosphere stratus temperature thermometer thickness chart thunderstorms tropopause troposphere trough upper upward usually vertical warm air mass warm front warmer water droplets water vapour weather area weather chart weather forecasting weather map weather report westerlies wind speed