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University Of Arizona ATMO 170A Chapter 11 1)A tropical storm is classified as a hurricane when
University Of Arizona
ATMO 170A
Chapter 11
1)A tropical storm is classified as a hurricane when .
a. a clear eye becomes visible on a satellite photograph
b. the central pressure drops below 950 mb
c. the winds exceed 64 knots (74 MPH)
d. it reaches Category 3 on the Saffir-Simpson scale
2. A weak trough of low pressure found in the tropics and along which hurricanes occasionally form is called a(n) .
a. tropical wave (or easterly wave)
b. equatorial trough
c. isobar
d. low-latitude low
3. Along a coastline, most hurricane damage is caused by .
a. the pressure gradient force
b. the storm surge
c. wind shear
d. release of latent heat
4. As surface air rushes in toward the eye of a hurricane, the air expands and should cool. The main reason the surface air is not cooler around the eye is because .
a. the sinking air near the eye warms the air
b. friction with the water adds heat to the air
c. the warm water heats the air
d. sunlight heats the air
5. At the periphery of a hurricane, the air is .
a. sinking and warming
b. sinking and cooling
c. rising and warming
d. rising and cooling
6. During a hurricane, the heaviest rainfall occurs in the .
a. eye
b. eyewall
c. spiral rain bands
d. storm's periphery
7. Hurricane energy comes from the latent heat of .
a. evaporation
b. condensation
c. fusion
d. melt
8. Hurricanes cannot form along the equator because .
a. water temperatures are too cold along the equator
b. the Coriolis force is too small along the equator
c. there are no feedback mechanisms along the equator
d. it's too humid for the ocean water to evaporate
9. Hurricanes dissipate when .
a. surface inflow of air is less than upper-level outflow of air
b. they move over colder water
c. they move over calm water
d. water temperatures below the eyewall increase
10. Hurricanes do not form .
a. along the equator
b. when the trade wind inversion is weak
c. when the wind shear is weak
d. near an easterly wave
11. Most of the overall destruction caused by a hurricane is due to .
a. high winds
b. flooding
c. lightning
d. tornadoes
12. Pressure at the center of a hurricane is than the surroundings at the surface and than the surroundings aloft.
a. higher; lower
b. lower; higher
c. lower; lower
d. higher; higher
13. Storms that form in the tropics are given names when .
a. they reach tropical storm strength
b. they become fully developed hurricanes
c. they approach to within 250 miles of land
d. rotation becomes visible on a satellite photograph
14. Suppose the eye of a hurricane passed directly over you, and you survived the experience. If winds were from the northeast as the eyewall first approached you, from what direction did the winds blow when the eyewall reached you the second time?
a. NW
b. NE
c. SE
d. SW
15. The main feature distinguishing a hurricane from an ordinary tropical storm is that .
a. hurricanes are larger
b. tropical storms are more than 500 miles from the U.S. mainland
c. winds speeds are greater in a hurricane
d. hurricanes have a clearly defined eye on satellite photographs
16. The main source of energy for a hurricane is the .
a. upper-level jet stream
b. rising of warm air and sinking of cold air in the vicinity of weather fronts
c. warm ocean water and release of latent heat energy by condensation
d. ocean currents and tides
17. The skies in the center of a hurricane are often cloud free. This is because the air in the eye is
.
a. sinking
b. very cold
c. dry
d. expanding
18. The strongest winds in a hurricane are found .
a. at the center of the storm
b. in the eye wall
c. at upper levels, above the center of the hurricane
d. near the periphery of the hurricane
19. The strongest winds in a hurricane heading westward toward Florida would most likely be found on the side.
a. northern
b. southern
c. eastern
d. western
20. The term storm surge refers to .
a. the leading edge of a hurricane
b. a higher-than-average incidence of tropical storm occurrence
c. a rise in ocean level of several meters or more
d. the increasing speed of a hurricane as it moves in the middle latitudes
21. The vertical structure of the hurricane shows an upper-level of air, and a surface of air.
a. outflow; inflow
b. outflow; outflow
c. inflow; outflow
d. inflow; inflow
22. Typhoons and hurricanes .
a. cannot occur at the same time
b. are different types of storms
c. never appear in the same hemisphere
d. are the same type of tropical storm
23. Which environmental conditions are most favorable for hurricane formation?
a. Winds are light, humidity high, and surface water temperature is warm.
b. Winds are light, humidity low, and surface water temperature is cool.
c. Winds are high, humidity high, and surface water temperature is cool.
d. Winds are high, humidity low, and surface water temperature is warm.
24. The terms typhoon and cyclone refer to the initial weaker stages in the development of a hurricane.
a. True
b. False
25. There is a reduction in the number of Atlantic hurricanes during a major El Niño event.
a. True
b. False
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