PowerPoint Presentation - Definitions of Liquid Precipitation

small raindrop

Area swept is

smaller than area of drop

Collision-Coalescence

Big water drops fall faster than small drops
As big drops fall, they collide with smaller drops
Some of the smaller drops stick to the big drops

Collision-Coalescence

Drops can grow by this process in warm clouds with no ice

•Occurs in warm tropical clouds

Collection Efficiency 10-50%


	Define Coalesence…collection of smaller drops by larger, faster falling drops.
	Inefficient mechanism, only 10-50% of smaller drops in path stick.
	Important for Warm Clouds…no ice.