Atmospheric Moisture and Precipitation

Atmospheric Moisture and Precipitation - Atmospheric...

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Atmospheric Moisture and Precipitation 4 mechanisms for lifting air: o Convergent lifting—air flow toward an area of low pressure Displaces air upward The warm air pushed upward in the south (close to ITCZ) can create tropical storms o Convectional lifting (local heating)—lifting o fthe air mass promoted by local surface heating (as mass moves by) Cumulous clouds and heavy precipitation featured in summertime North America Dominates areas in which moist unstable air is heated from below o Orographic lifting—when air is lifted upslope against a mountain May form stratiform clouds Lifted air across Windward—wet/cooler side of the mountain Leeward—dryer hotter side of the mountain Chinook winds—warm downslope winds characteristic of leeward side of mountains Rain shadow—dry regions of leeward mountains o Frontal lifting—lifting along leading edges of contrasting fronts (warm and cold) Cold front (cold air mass is active)
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