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ENVIRSC 1A03 (130)
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Lecture

Precipitation and Snow.docx

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Department
Environmental Science
Course
ENVIRSC 1A03
Professor
Luc Bernier
Semester
Winter

Description
ENVIR SCI 1A03 February 10, 2014 Precipitation and Snow What is Precipitation? • Any form of water that falls from a cloud and reaches from the ground. • Either liquid or solid water • Driven by the same processes as the same processes of cloud formation • Can occur very quickly (within a few hours of cloud formation) How does Precipitation form? • In warm clouds (greater than 0 deg): water droplets condense. • Air mass cools at MALR as it rises within the cloud • The droplets fall because the of the updraft and gravity imbalance. o As the mass of the droplet increases, the pull of gravity outweighs the updraft. • In cold clouds: ice crystals form and grow o Initially at the base of the cloud, the water cools (supercool) extremely fast, so much so that it does not actually freeze and eventually they coalesce and transfers and grows the ice crystals • Collision and Coalescence o Constant speed achieved when air resistance equals gravity: terminal velocity o As the larger droplets are falling, they will accumulate the smaller droplets and fuse with the larger droplets and thus grown and then reach the ground surface • Cold Clouds: the base of cloud to top of cloud and below 0 deg. • Cool Clouds: base is just above 0 deg. And the top is below. What ar
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