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ATMO 170 Sect. 3
Quiz #4 Dec. 4, 2014
Name____________________________________
(please also put your name on the back)
1.
(15 pts) The direction of the _______ force is always perpendicular to the wind. The _______ force is always
perpendicular to the contours on a weather map. The strength of the _______ for wind blowing over land will
be different from wind blowing over the ocean. (fill in the blanks)
a. frictional
b. net
c. pressure gradient
d. Coriolis
2.
(10 pts) Which two of the following would be the best indicators of a thunderstorm with a rotating updraft?
a. gust front
b. anvil cloud
c. wall cloud
d. hook echo
e. mammatus clouds
f. microburst
3.
(5 pts) The ____________________________ scale is used to rate hurricane intensity.
4.
(5 pts) Air is moving in a circular path at constant speed as
shown at right. A net inward force is present
a. in Fig. A and Fig. B
b. in Fig. C and Fig. D
c. in all 4 figures
d. in none of the figures
5.
(5 pts) The strongest tornadoes are thick and TILTED VERTICAL
6.
(5 pts) The air in the eye of a hurricane is clear because the _______.
a. air is dry
b. winds are calm
c. pressure is low
d. air is sinking
7.
(5 pts) The rate of the earth’s rotation on its axis affects the strength of the _______ force.
a. Coriolis
b. pressure gradient
c. frictional
d. gravitational
8.
(10 pts) Intracloud lightning is MORE LESS common than cloud-to-ground lightning. Negative cloud-toground lightning is MORE LESS common than positive cloud-to-ground lightning
9.
(5 pts) A narrow, intense thunderstorm downdraft is a MICROBURST MESOCYCLONE.
10.
(10 pts) Does the figure at right show winds blowing around
a center of HIGH or LOW pressure? Is this a NORTHERN
or SOUTHERN hemisphere weather chart?
11.
(5 pts) The _______ scale is used to rate tornado strength or intensity
a. Kelvin
b. Richter
c. Saffir-Simpson
d. Fujita
e. Beaufort
12.
(5 pts) Which one of the following doesn’t belong in the same group as the other three?
a. hurricane
b. tsunami
c. typhoon
d. cyclone
13.
(5 pts) An air mass thunderstorm will begin to weaken and dissipate when
a. enough electrical charge is created to produce lightning
b. the downdraft begins to spread throughout the inside of the cloud
c. all of the cloud and precipitation particles turn into ice
d. the top of the cloud reaches stable air at the bottom of the stratosphere
Name___________________________________________
14.
(5 pts) Which of the following processes comes first in a cloud-to-ground lightning discharge?
a. dart leader
b. upward discharge
c. stepped leader
d. return stroke
15.
(5 pts) The net force being exerted on a sky diver that is falling downward in a straight line at constant speed is
UPWARD ZERO DOWNWARD.
16.
(10 pts) You would find HIGH LOW pressure and DIVERGING CONVERGING winds at the top center
of an intensifying hurricane.
17.
(5 pts) Stationary air will begin to move in the direction of the _______ force.
a. frictional
b. centrifugal
c. pressure gradient
d. Coriolis
18.
(15 pts) Surface winds spin CLOCKWISE COUNTERCLOCKWISE and spiral INWARD OUTWARD
around high pressure in the southern hemisphere. Air RISES SINKS in the center of high pressure in the
southern hemisphere.
19.
(5 pts) The 1st law of motion that we have been using in this course was formulated by
a. Archimedes
b. Coriolis
c. Galileo
d. Aristotle
e. Newton
20.
(5 pts) The front edge of the cold downdraft air moving outward at the ground below a thunderstorm is called
a. a gust front
b. a thermal circulation
c. a squall line
d. a dryline
21.
(15 pts) Is the inward point force in the figure at right the PGF or the
CF? Does the figure show UPPER LEVEL or SURFACE winds
blowing in the NORTHERN or the SOUTHERN hemisphere?
22.
(15 pts) Tornado winds always spin around a center of LOW HIGH pressure.
Are the winds in most tornadoes MORE or LESS than 100 MPH?
Do the strongest tornadoes occur in the SPRING SUMMER FALL or WINTER?
23.
(5 pts) Which of the following creates the electricity in thunderstorms needed for lightning?
a. ultraviolet light
b. collisions between precipitation particles
c. wind shear
d. condensation and evaporation
e. St. Elmo's fire
f. expanding air
Extra Credit (you can earn up to 10 pts)
1.
(5 pts) The term cylone refers to
a. counterclockwise spinning winds
c. clockwise spinning winds
b. winds spinning around low pressure
d. winds spinning around high pressure
2.
(6 pts) Most cars are made out of metal which makes them a DANGEROUS SAFE place to be during a
lightning storm. It is DANGEROUS SAFE to use a cell phone during a lightning storm
3.
(5 pts) To be considered a _______ winds must exceed 75 miles per hour (MPH).
a. gust front
b. tornado
c. hurricane
d. mesocyclone
e.microburst