Learning Objective: Recognize the 

 characteristics, classifications, 

 and formative stages in the develop- 

 ment of tropical systems. 



10-29. The various types of circular low- 

 pressure areas found in the Tropics are 

 classified according to their 



1. maximum wind speed 



2. point of origin 



3. center of pressure 



4. temperature 



10-23. Tropical waves move westward at an aver- 

 age speed of 10 to 15 knots and slope 

 eastward with height reaching a maximum 

 intensity between 



1. 850 to 500 mb 



2. 700 to 300 mb 



3. 700 to 500 mb 



4. 850 to 300 mb 



10-24. The Inverted-V formation type tropical 

 wave is best defined in the 



1. eastern and central North Atlantic 



2. eastern and central North Pacific 



3. western and central North Atlantic 



4. western and central North Pacific 



10-25. The forced convergence necessary for the 

 development of the individual cloud 

 system in the ITCZ is caused by a 

 combination of friction and 



1. anticyclogenesis 



2. cyclogenesis 



3. high-level cyclonic wind shear 



4. low-level cyclonic wind shear 



10-26. When does the precipitation intensity on 

 the ITCZ reach a maximum? 



1. Just before dawn 



2. Just after dawn 



3. Just before noon 



4. Just after sunset 



10-27. The widest band of cloud cover associated 

 with the ITCZ is found in the 



1. Atlantic Ocean 



2. Indian Ocean 



3. Pacific Ocean 



4. Gulf of Mexico 



10-28. In what way, if any, do tropical cyclones 

 differ from tornadoes? 



1. Tornadoes have lower wind velocities, 

 are of shorter duration, and affect 

 less area 



2. Tornadoes have higher wind velocities, 

 are of shorter duration, and affect 

 less area 



3. Tornadoes have higher wind velocities, 

 affect less area, and are of longer 

 duration 



4. There is no difference except in 

 the geographic location of storm 



In items 10-30 through 10-32, select from 

 column B the tropical cyclone stage identified 

 with the occurrence of each event listed in 

 column A. 



B. Stages 



1. Formative 



2. Immature 



3. Mature 



4. Decaying 



A. Events 



10-30. The transformation of 

 the storm into an 

 extratropical cyclone 



10-31. The appearance of west- 

 erly winds in low tropi- 

 cal latitudes where 

 easterly winds normally 

 prevail 



10-32. The organization of the 



wind system into a tight, 

 symmetrical ring around 

 the eye 



10-33. A tropical cyclone has reached which 

 stage when it assumes the character- 

 istics of an extratropical cyclone? 

 1. Formative 

 3. Immature 



3. Mature 



4. Decaying 



10-34. The strongest winds of a tropical 



cyclone in the Northern Hemisphere are 

 usually found in which section of the 

 storm? 



1. Left semicircle 



2. Right semicircle 



3. Left rear quadrant 



4. Right rear quadrant 



10-35. Where does the rapid, significant drop 

 in barometric pressure associated with 

 tropical cyclones begin? 



1. Three hours before the storm 



2. Well in advance of the storm 



3. On the outer edge of the right front 

 quadrant of the storm 



4. On the outer edge of the left rear 

 quadrant of the storm 



10-36. What are the most important cloud types 

 found within a tropical cyclone? 



1. Precipitation mid-clouds 



2. The advance cirrus and cirrostratus 



3. Heayy cumulus and cumulonimbus 



4. All species of low clouds 



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