ENVIRSC 1A03 Lecture Notes - Lecture 8: Graupel, Freezing Rain
8 Nov 2015
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What is precipitation: the process may start quickly (through convective heating) Formation in warm clouds: as air rises, it cools, creating droplets of water in clouds as more condensation is added, drops grow and collide with each other, becoming bigger and falling. Terminal velocity: the speed at which a droplet falls. Formation in cold clouds ice crystals form from deposition or freezing: water drops decrease and are deposited on ice crystals, and if the crystals become large enough they fall. Cool clouds can be formed of liquid water, super cold water and or ice. Accretion falling ice crystals may freeze super cold droplets on contact and produce larger ice particles. Sleet ice crystals collide and stick together end product is a snowflake at some point on the way to the ground, it is rain: when a snowflake freezes before hitting the ground.
