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Chapter 8 - Weather Short-term day-to-day condition of the...

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1 Chapter 8 Weather Weather Short-term day-to-day condition of the atmosphere Snapshot of atmospheric conditions A technical report of the Earth-atmosphere heat energy budget Long-term average conditions over the decades and extremes in a region? Weather Temperature Air pressure Relative humidity Wind speed and direction Seasonal factors – insolation receipt (daylength & sun angle) Humidity Water vapor in the air The capacity of the air for water vapor f (temperature of air, temperature of water vapor) How do we express humidity? Three States of Water Humidity Relative humidity Tells us about how near the air is to saturation The amount of water vapor in the air Relative humidity = x 100 The maximum possible water vapor in the air <100% Æ evaporation exceeds condensation = 100% Æ evaporation = condensation : SATURATION
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