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THE WATER VAPOUR IN THE ATMOSPHERE
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adiabatic lapse rate aeroplane aloft altitude anemometer anticyclones ascent atmosphere barograph barometer Beaufort Scale bumpiness calm cause centre Chapter cloudless cold air mass cold front condensation continental polar convection cooler cooling cumulo-nimbus cumulus clouds cyclonic decrease deflected dense depression dew-point effect forecast frequent geostrophic wind give gradient grams ground haze heat height high-pressure horizontal indicate inversion of temperature isobars land latitude less low cloud low-pressure systems lower maritime polar mean mercury meteorological meteorologist miles millibar move night north-east observations occluded front ocean particles pilot plotted pressure systems rain rapidly rising currents saturated skies sometimes speed stations strato-cumulus stratus sub-tropical summer surface air surface wind synoptic charts temperature falls tropical air tropopause tube turbulence upward usually variable vertical movements visibility warm front warm sector warmer water vapour Westerlies wind blows winter