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University Of Arizona ATMO 170A Chapter 10 1)A cloud-to-ground lightning discharge will sometimes appear to flicker
University Of Arizona
ATMO 170A
Chapter 10
1)A cloud-to-ground lightning discharge will sometimes appear to flicker. This is because .
a. you are able to see the separate steps of the stepped leader
b. you are able to distinguish separate return strokes
c. the bright light causes you to blink
d. of refraction caused by turbulent thunderstorm winds
2. A group of thunderstorms that develop next to one another, each in a different stage of development, is called a(n) .
a. ordinary thunderstorm
b. thunderstorm cluster
c. multicell thunderstorm
d. mature thunderstorm
3. A line of thunderstorms that forms ahead of an advancing cold front is called a .
a. squall line
b. wall cloud
c. gust front
d. dry line
4. A relatively narrow downburst, less than four kilometers wide, is called a .
a. microburst
b. macroburst
c. funnel cloud
d. mesocyclone
5. A small thunderstorm cloud blowing dust at the ground could warn of a severe hazard to aircraft. Why?
a. This could be the first indication of a tornado.
b. This indicates that it is likely that hail will soon begin to fall.
c. This could indicate an intense downdraf t or microburst.
d. The airplane could be struck by lightning.
6. A supercell storm is a(n) .
a. multicell thunderstorm that forms as a line of thunderstorms
b. number of individual multicell thunderstorms that organize into a large convective weather system
c. elongated, ominous-looking storm cloud that forms just behind a gust front
d. intense long-lasting thunderstorm with a single violently rotating updraft
7. A rotating V-shaped cloud that hangs from the bottom of thunderstorm but does not touch the ground is called a .
a. wedge cloud
b. wall cloud
c. funnel cloud
d. roll cloud
8. An ordinary cell thunderstorm is a .
a. thunderstorm that does not produce lightning or thunder
b. thunderstorm that has a tilted updraft and downdraft
c. scattered or isolated storm that is not severe
d. thunderstorm that does not produce hail
9. Beneath an intense thunderstorm, the downdraft may become localized so that it hits the ground and spreads horizontally in a radial burst of wind. This is called a .
a. dry line
b. outflow boundary
c. squall line
d. downburst
10. If a tornado is rotating in a counterclockwise direction and moving toward the northeast, the strongest winds will be on its side.
a. southwestern
b. southeastern
c. northeastern
d. northwestern
11. If you see lightning and then, 15 seconds later, hear the thunder, the lightning stroke is about
miles away.
a. 45
b. 15
c. 5
d. 3
12. In the United States, dryline thunderstorms are most common .
a. in the Rocky Mountains
b. in the desert southwest
c. in the Great Plains
d. in California
13. Many flash floods, including those that occurred over parts of New England and the mid-Atlantic states during June 2006, and in Colorado's Big Thompson Canyon in July 1976, are the result of thunderstorms that .
a. contain no lightning
b. form in a dry air mass
c. move slowly
d. have weak or non-existent downdrafts
14. Most tornadoes have winds that are .
a. greater than 500 knots
b. greater than 220 knots
c. between 125 and 220 knots
d. less than 125 knots
15. Occasionally, an elongated ominous-looking cloud forms just behind a gust front. This type of cloud, which appears to slowly spin about a horizontal axis, is called a .
a. downburst
b. shelf cloud
c. wall cloud
d. roll cloud
16. Ordinary cell thunderstorms only last about one hour and begin to dissipate when .
a. lightning neutralizes all the electrical charge in the cloud
b. when all the precipitation particles in the cloud turn to ice
c. when the downdraf t spreads throughout the cloud and cuts off the updraft
d. when solar heating at the ground begins to decrease
17. The downdraft in an ordinary cell thunderstorm is created mainly by .
a. the melting of snow in the anvil
b. electrical attraction between the cloud and ground
c. the release of latent heat as water in the cloud freezes
d. evaporating raindrops that make the air cold and heavy
18. The greatest annual number of thunderstorms in the United States occurs in .
a. the Ohio valley
b. the Central Plains
c. Florida
d. Texas
19. The initial stage of an ordinary cell thunderstorm is the .
a. mature stage
b. dissipating stage
c. cumulus stage
d. multicell stage
20. The leading edge of a thunderstorm's cold outflowing air is known as a .
a. downburst
b. squall line
c. gust front
d. dry line
21. The majority of lightning strikes occur .
a. from a cloud to the ground
b. from one cloud to another cloud
c. from a cloud to the surrounding air
d. within a cloud
22. The so-called Tornado Belt, or Tornado Alley, of the United States is located .
a. in Florida
b. in the Central Plains
c. in the middle Atlantic states
d. along the Gulf Coast
23. The top of a thunderstorm is normally charged, and the middle and lower parts are
charged.
a. negatively; negatively
b. negatively; positively
c. positively; positively
d. positively; negatively
24. Thunder is caused by .
a. the collision between two thunderstorms with opposite electrical charge
b. the rapid heating of air surrounding a lightning channel
c. the explosion that occurs when + and - charge collide and neutralize each other
d. turbulent wind motions inside the thunderstorm
25. Tornadic thunderstorms that form ahead of an advancing cold front most often travel from .
a. north to south
b. northwest to southwest
c. southwest to northeast
d. southeast to northwest
26. What type of rotating cloud develops from a funnel cloud or tornado and extends beneath a severe thunderstorm?
a. mammatus cloud
b. roll cloud
c. wall cloud
d. suction vortices
27. What weather system can grow to be as much as 1000 times larger in area than an ordinary cell thunderstorm, even large enough to cover an entire state?
a. overshooting thunderstorm
b. mesoscale convective complex
c. derecho
d. mesocyclone
28. What would you expect to observe during the passage of a gust front?
a. Temperatures will drop and winds will die down.
b. Temperatures will rise and winds will die down.
c. Temperatures will drop and winds will become strong and gusty.
d. Temperatures will rise and winds will become strong and gusty.
29. Which statement about tornadoes is correct?
a. All tornadoes rotate in a counterclockwise direction.
b. Tornadoes never strike the same place twice.
c. All tornadoes make a distinctive roar.
d. The United States has more tornadoes than any other country in the world.
30. You are generally safe inside an automobile during a lighting storm because .
a. the car's radio antenna will act as a lightning rod
b. the rubber tires insulate you from the ground
c. metal cars do not become electrically charged
d. the metal car body will carry the lightning current around the passengers inside
31. In some situations, individual thunderstorms may organize into a convective weather system that may be 1000 times larger than an individual storm.
a. True
b. False
32. Most cloud-to-ground lightning flashes consist of a single return stroke.
a. True
b. False
33. On rare occassions, strong tornadoes (intensity of EF4 or EF5) sometimes form along a thunderstorm gust front.
a. True
b. False
34. When the air is dry, tornadoes can remain invisible until they reach the ground and pick up dust.
a. True
b. False
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