Quiz #3
Study Guide pt. 2
Cloud identification and classification (35
pts). Ten cloud types. Clouds are classified according to
altitude and appearance; what key words are used? You should be
able to identify each of the 10 cloud types from pictures (hand
drawn) or from a written description (eg. high altitude cloud with
a filamentary appearance). How would you distinguish between Cc,
Ac, and Sc or between Cs and As? What cloud type could produce a
halo? Common features on thunderstorm clouds: anvil, mammatus,
shelf cloud. Here's a link to the hand drawn cloud chart shown
in class (abbreviations are used instead of the full cloud names)
Sample
Questions Quiz
#4: 1,4,10,EC2 Final Exam: 8,44
Formation of precipitation (15 pts).
Approximate sizes of cloud condensation nuclei, cloud droplets,
and raindrops. It is relatively easy to form cloud droplets
(condensation); what about precipitation? Which of the two
processes below is the most important precipitation producing
process in the US?
Collision
coalescence process. Produces rain in warm clouds (clouds
in the tropics which contain water droplets only). Falling
droplets collide (why?) and stick together. Effects of cloud
thickness and updraft speed on raindrop size. Which cloud type
produces the largest raindrops and the heaviest precipitation?
About how large can raindrops get (why don't they get any larger)?
Ice
crystal process. Structure of a cold cloud. What are
supercooled water droplets? Where are they found in cold clouds?
Are there more water droplets or ice crystals in the mixed phase
region in a cold cloud? Are ice crystal nuclei abundant or scarce
in the atmosphere? Where does precipitation begin to form in a
cold cloud? Why are ice crystals able to grow while supercooled
water droplets do not? Riming (accretion) and graupel. Can the ice
crystal process produce rain or just frozen forms of
precipitation?
Types of
precipitation (20 pts). Rain, virga, snow (snowflakes),
drizzle, fall streaks, sleet (ice pellets), hail, freezing rain,
graupel ("soft hail" or snow pellets). What type of cloud and
special cloud characteristics are needed for hail formation?
Sample
Questions Quiz #4: 6, 9,
12, 13, 15 Final Exam: 9, 40
there won't be any questions from the
following topic on Quiz #3
Satellite Photographs (0 pts).
Infrared
and visible photographs. What do white and grey on these
two types of photographs represent? Thunderstorms can
produce severe weather; how would a thunderstorm appear on VIS
and IR photographs? How can satellites view clouds at
night? How is it possible to see air motions in regions
where there aren't any clouds? Geostationary and low-earth
orbit satellites. Here is a
sample satellite photograph question.
Sample
Questions Quiz
#4: 16 Final Exam: 38
Reviews
Tue., Nov. 5
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2-3:15 pm
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Saguaro 225
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Wed., Nov. 6
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2-3:15 pm
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Saguaro 225
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Wed., Nov. 6
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3:30-4:30 pm
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Chavez 307
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