6-19. 



6-20. 



6-21. 



6-22. 



6-23. 



6-24. 



Normally, a station ahead of a cold front 

 will show a pressure tendency that is 



1. steady 



2. falling 



3. rising steadily 



4. rising unsteadily 



Which symbol is used on a weather map to 

 show a fall and then a rise in pressure, 

 indicating that a cold front passed the 

 •station concerned during the 3-hour period 

 prior to map time? 



A station in the United States that is 

 ahead of a cold front will usually report 

 the wind to be from the 



1. north or northeast 



2. east or southeast 



3. south or southwest 



4. west or northwest 



Continuous precipitation generally occurs 

 and lasts for several hours after the 

 passage of a/an 



1. occluded front 



2. active warm front 



3. fast-moving cold front 



4. slow-moving cold front 



After the passage of an active warm front, 

 a station in the United States will 

 generally report the wind to be from the 



1. east 



2. southeast 



3. northwest 



4. southwest 



If a station is located 450 miles east of 

 a warm front that is moving due eastward 

 at a uniform speed of 600 miles per day, 

 approximately how many hours will pass 

 before precipitation associated with the 

 front can be expected at the station? 



1. 6 hr 



2. 12 hr 



3. 18 hr 



4. 24 hr 



6-25. Which of the following statements about 

 occluded fronts is correct? 



1. The weather clears rapidly after the 

 passage of a warm-type occlusion, but 

 precipitation and icing occur after 

 the passage of a cold-type occlusion 



2. Precipitation is ordinarily produced 

 by the cold-type but not the warm-type 



3. Thunderstorms are ordinarily produced 

 by the warm-type but not the cold-type 



4. Precipitation is spread over a much 

 wider area in the warm-type than in 

 the cold-type 



6-26. In the final ana]ysis of a weather map, 

 how must all low-pressure centers be 

 labeled? 



1. L in blue 



2. L in red 



3. LOW in blue 



4. LOW in red 



6-27. What is the best indication of the exist- 

 ence of a quasi-stationary front? 



1. Wind shift 



2. Pressure rise 



3. Cloud deck 



4. Temperature drop 



6-28. Isobars should be drawn at a front so that 

 they are 



1. parallel to the front 



2. perpendicular to the front 



3. V-shaped and pointing toward lower 

 pressure 



4. V-shaped and pointing toward higher 

 pressure 



In items 6-29 through 6-32, select from column B 

 the one color reproduction weather symbol 

 associated with each surface analysis feature in 

 column A. 



A. Analysis Features 



6-29. Occluded front 



6-30. Cold front 



6-31. Quasi-stationary front 



6-32. Frontogenesis resulting 

 in warm front aloft 



35 



