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ATMOreview4 - Chapter 6 1 Know the types of clouds and...

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Chapter 6 1. Know the types of clouds and description of each given in class. Skip the last section on how stability changes. CIRRUS – thin wispy clouds of ice (thin white clouds resembling mares’ tails) STRATUS – layered clouds (uniform layer of low cloud ranging from whitish to gray) CUMULUS – clouds having vertical development (detached billowy clouds w/ flat bases and mod. Vertical development. Sharply defined boundaries) NIMBUS – rain-producing clouds (low cloud producing rain, produces darker skies) Chapter 7 1. Know the difference between a warm cloud and a cold cloud. WARM CLOUD: temp. greater than 0 degrees C throughout. COLLISION- COALESCENCE PROCESS causes precip. COLD CLOUD: temp greater than 0 degrees C in lower reaches BUT subfreezing conditions above. 2. Explain how the collision-coalescence process and the Bergeron process work to form precipitation. COLLISION-COALESCENCE PROCESS -depends on the differing fall speeds of difference sized droplets -largest droplet (collector drop) falls overtaking some of the smaller droplets in its path c of its greater terminal velocity - as collector drop falls, it can only hit larger drops (not small droplets) and collides. They can form together or bounce apart but usually form together. BERGERON PROCESS -The equilibrium vapor pressure over water is greater than that over ice and therefore in a cold cloud, the water will be out of vapor pressure equilibrium and will evaporate to reach equilibrium. The ice will condense this vapor and grow into a larger ice crystal. Eventually this ice crystal will grow large enough to fall. It may even collide with other ice crystals and grow larger still through collision coalescence . The Bergeron Process often results in precipitation. 3. Define virga. - virga is an observable streak or shaft of precipitation that falls from a cloud but evaporates before reaching the ground. 4. Know the difference between freezing rain and sleet.
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Sleet is snow that melts in the sky and re-freezes before hitting the ground as ice pellets. Many people confuse this with hail - which is similar, but is not quite the same. (Hail is from
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