6-46. The plotting and analysis of constant 



pressure charts are based on radiosonde 

 and rawinsonde releases made daily at 

 which time? 



1. 0000 and 1200GMT 



2. 0000, 0800, and 1600GMT 



3. 0000, 0600, 1200, and 1800GMT 



4. 0000, 0400, 0800, 1200, 1600, and 

 2000GMT 



6-47. In a cold core high, how does temperature 

 change toward the center, and how does 

 pressure change with height? 



1. Temperature decreases toward the 

 center, and pressure decreases with 

 height 



2. Temperature increases toward the 

 center, and pressure decreases with 

 height 



3. Temperature decreases toward the 

 center, and pressure increases with 

 height 



4. Temperature increases toward the 

 center, and pressure increases with 

 height 



6-48. The vertical spacing of the isobars is 

 farther apart in the center than on the 

 outside in the case of 



1. cold core lows and warm core highs 



2. cold core lows and cold core highs 



3. warm core lows and cold core highs 



4. warm core lows and warm core highs 



6-49. Which of the following statements is cor- 

 rect regarding the vertical axes of pres- 

 sure systems? 



1. Both high and low pressure systems 

 normally slope northward 



2. The centers of pressure systems aloft 

 seldom coincide with the surface 

 center 



3. The centers of pressure systems aloft 

 normally coincide with the surface 

 center 



4. High pressure systems normally slope 

 toward colder air aloft and lows 

 slope toward warmer air 



6-50. Contours bear the same relationship to 



upper air analyses as which of the follow- 

 ing bear to surface analyses? 



1. Isobars 



2. Isotherms 



3. Isopleths 



4. Isallobars 



In items 6-51 through 6-53, select from column B 

 the upper air chart marking applicable to each 

 constant pressure chart element listed in column 

 A. 



A. Chart 

 Element 



6-51. Isotachs 



6-52. Isoheights 



6-53. Isodrosotherms 



6-56. 



B. Chart Markings 



1. Solid black pencil 

 lines 



2. Solid red lines 



3. Very light solid 

 green lines 



4. Short dashed green 

 lines 



6-54. Ordinarily the first lines that should be 

 drawn on a constant pressure chart repre- 

 sent the 



1. temperature changes 



2. current pressure centers 



3. current frontal structures 



4. past history of fronts and pressure 

 systems 



Learning Objective: Recognize basic 

 factors and characteristics of ocean 

 waters with respect to sea surface 

 temperature analysis. 



6-55. Which arrow represents the correct plot 

 for sea flow toward 340°? 





Any approach to SST analysis must consider 

 all but which of the following factors? 



1. Orientation of the water masses 



2. Current structure 



3. Local characteristics of the ocean area 



4. Depth of the water 



37 



