Cloud Formation.

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Presentation transcript:

Cloud Formation

Air Pressure Caused by the weight of the air above it Decreases with elevation Barometric pressure Barometer Millibars / mm Hg

Pressure and Temperature When pressure drops air expands and cools

Cloud Formation Air rises Air expands Dew point is reached decrease in pressure Air expands Temperature decreases Dew point is reached Water vapor condenses on tiny particles (condensation nuclei)

Processes That Lift Air Mountains

windward leeward

Processes That Lift Air Fronts Boundary between two different air masses Warm air is forced up by more dense cold air

Source region – area where air masses originate

Processes That Lift Air Convergence

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