1. Chapter 13 Review
The Nature of Storms

2. Which is NOT a condition that must exist in order to produce a thunderstorm?
a source of moisture
lifting of the air mass
an unstable atmosphere
a source of wind

3. In what stage of a thunderstorm would an equal amount of updrafts and downdrafts exist?
cirrus stage
cumulus stage
mature stage
dissipation stage

4. What stage of a thunderstorm is shown?
cirrus stage
cumulus stage
mature stage
dissipation stage

5. What ultimately leads to a thunderstorm’s dissipation?
the production of downdrafts
the loss of a supply of cold air
the decrease in cloud droplets
the decrease of surface winds

6. Fujita Intensity Scale
Path
Duration
Wind Speed F0
up to 4 km
1-10 min
km/h F1
km/h
F2-F3
24 km +
20 min +
km/h F4
80 km +
1 h +
km/h F5
km/h
A tornado lasts 9 minutes, is 2 km wide and has wind speeds of 99 km/h. What intensity level would it be classified? F0 F1
F2-F3 F4

7. Fujita Intensity Scale
Path
Duration
Wind Speed F0
up to 4 km
1-10 min
km/h F1
km/h
F2-F3
24 km +
20 min +
km/h F4
80 km +
1 h +
km/h F5
km/h
How fast must the winds of a tornado be traveling to be classified as a F4 tornado?
km/h
km/h
km/h
km/h

8. Fujita Intensity Scale
Path
Duration
Wind Speed F0
up to 4 km
1-10 min
km/h F1
km/h
F2-F3
24 km +
20 min +
km/h F4
80 km +
1 h +
km/h F5
km/h
A tornado has lasted for 70 minutes and its path was 84 km wide. What would its wind speed have to be in order for it to be categorized as an F4 tornado?
332 km/h
485 km/h
502 km/h
510 km/h

9. When a storm over an ocean has wind speeds of 75 km/h what can it be classified as?
a hurricane
a tropical depression
a tropical storm
a cyclone

10. the eye the eyewall the rainbands the outer edge
At which point would the strongest winds and densest clouds of the hurricane be located?
the eye
the eyewall
the rainbands
the outer edge

11. What is characteristic of the eye of the hurricane?
the strongest winds and densest clouds
thunderstorms
light clouds and precipitation
calm weather and blue sky

12. Because the hurricane is moving in a counterclockwise direction, what can be inferred about this hurricane?
The moving tropical disturbance which caused this hurricane came from the west.
The moving tropical disturbance which caused this hurricane came from the east.
This hurricane is occurring in the northern hemisphere.
This hurricane is occurring in the southern hemisphere.

13. Category
Winds (km/h)
Change in sea level
Damage 5
>250
>5.5 m
catastrophic 4 m
extreme 3 m
extensive 2 m
moderate 1 m
minimal
A hurricane has been classified as a category 3 hurricane. Which of the following is NOT true?
the hurricane can not get any stronger
the hurricane has winds of 200 km/h
the hurricane can not get any weaker
the hurricane has sea level changes of 4.0 m

14. Category
Winds (km/h)
Change in sea level
Damage 5
>250
>5.5 m
catastrophic 4 m
extreme 3 m
extensive 2 m
moderate 1 m
minimal
A hurricane hits land with wind speeds of 225 km/h and sea level changes of 5.5 m. What damage classification would it be labeled as according to the Saffir-Simpson Hurricane Scale?
catastrophic
moderate
extensive
extreme

15. Air Temperature (ºF) 75 80 85 90
Relative Humidity (%)
Apparent Temperature (ºF) 69 73 78 83 10 70 20 72 77 82 87 30 84 40 74 79 86 93 50 81 88 96 60 76
100
106 97
113
102
122 91
108
All public pools in a local city are free when the heat index is at least 90°F. What is the minimum amount of relative humidity needed for the pools to be free if the air temperature is 85°F?
60%
10%
80%
50%

16. Air Temperature (ºF) 75 80 85 90
Relative Humidity (%)
Apparent Temperature (ºF) 69 73 78 83 10 70 20 72 77 82 87 30 84 40 74 79 86 93 50 81 88 96 60 76
100
106 97
113
102
122 91
108
What air temperature and relative humidity produces the same apparent temperature as when the air temperature is 90°F and the relative humidity is 40%?
70°F, 85%
75°F, 90%
85°F, 60%
85°F, 70%

17. Flooding occurs if an area receives 27 cm of total rainfall
Flooding occurs if an area receives 27 cm of total rainfall. If a storm lasts for 21 hours with a rainfall rate of 1.5 cm/h would the area become flooded?
Yes, because the area would receive 31.5 cm of rain.
No, because the area would receive 21 cm of rain.
Yes, because the area would receive 315 cm of rain.
Yes, because the area would receive 40.5 cm of rain.

18. A(n) ____ thunderstorm forms because of unequal heating of Earth’s surface within one air mass.
frontal mass
cold front
air mass
air pressure

19. The rising, moist updrafts and the falling, cool downdrafts form a convection cell that produces the ____ associated with thunderstorms.
temperatures
thunder
humidity
gusty surface winds

20. Very severe thunderstorms can form when a ____ has a large continuous supply of warm air to lift and condense.
cold front
warm air mass
warm front
tornado

21. When friction between updrafts and downdrafts within a cumulonimbus cloud creates regions of air with opposite charges, ____ forms.
warm air
lightning
precipitation
ozone

22. ____ are often associated with very severe thunderstorms called supercells.
Tornadoes
Sea breezes
Hurricanes
Heat waves

23. A mound of water driven toward coastal areas by hurricane winds is called a ____.
cyclone
supercell
storm surge
cold front

24. An extended period of well-below-normal rainfall is a ____.
flood
drought
heat wave
tropical cyclone

25. The phenomenon in which the effects of cold air are worsened by wind is the ____.
supercell
sea breeze
wind chill factor
cold wave

26. Air under a large high-pressure system sinks, warms, and causes above-normal temperatures
cold wave
drought
heat wave

27. High pressure associated with continental polar or arctic air
cold wave
drought
heat wave

28. Large, persistent high-pressure system associated with extended periods of below-normal rainfall
cold wave
drought
heat wave

29. Diagram A would most likely occur during the night.
True
False

30. The weather in diagram A is more likely to produce a thunderstorm than the weather in diagram B.
True
False

31. The weather in diagram B would be considered stable.
True
False

32. The air circulates counterclockwise in diagram B because the water cools slower than the land.
True
False

33. The cumulonimbus clouds associated with thunderstorms form from cumulus clouds and convection.
True
False

34. All tropical cyclones thrive on the energy in warm and cold air masses.
True
False

35. A Category 2 hurricane on the Saffir-Simpson hurricane scale is more dangerous than a Category 5 hurricane.
True
False