AEROGRAPHER'S MATE 3 & 2 



2. Indicate the speed of the wind by the ap- 

 propriate number of feathers, pennants, or com- 

 binations of both. 



3. Place the tens number of the wind direc- 

 tion on the en 3 of the wind barb shaft. 



4. Optional entries normally governed by 

 local procedure are: 



a. To place the actual wind speed in 

 parentheses at the tip of the wind feather or 

 pennant indicating the speed; 



b. To draw the wind shaft through the 

 station circle with an arrowhead on the end 

 pointed in the direction toward which the wind 

 is blowing. 



If the wind is calm, draw a, circle around 

 the station circle. If the wind is missing, do 

 not make an entry for the wind. If the wind 

 direction is encoded and the speed is missing, 

 enter an X at the end of the wind shaft where 

 the wind feather is normally located. 



The height is entered as encoded to the north- 

 east of the station circle, the temperature to 

 the northwest of the station circle in degrees 

 and tenths, and the dewpoint depression (or 

 dewpoint) to the southwest of the station circle 

 in degrees and tenths. 



If the height, temperature, or dewpoint de- 

 pression is missing, enter a dash in the ap- 

 propriate space for each of these elements. 



RECCO CODE PLOTTING. — The RECCO 

 code, explained in the previous chapter, enables 

 the airborne weather observer to encode ele- 

 ments peculiar to aircraft flight in addition to 

 the required standard meteorological values. 



The report designator always precedes the 

 report and means that the following code data 

 have been obtained from aerial meteorological 

 reconnaissance aircraft in flight. A report that 

 is one of a series from a particular aircraft 

 is generally identified by the name of the flight 

 and number of the report. (EXAMPLE: VUL- 

 TURE ONE, VULTURE TWO, etc.) An aircraft 

 on a tropical cyclone reconnaisance further 

 identifies the report by adding the name of 



the storm. (EXAMPLES, VULTURE SUSIE ONE, 

 VULTURE SUSIE TWO, etc.) 



In plotting the RECCO code, the first el 3- 

 ment to check is the day of the week (Y) and 

 the time (GGgg) to make sure that the report 

 is consistent with the time of the map being 

 plotted. After locating the position of the re- 

 port on the map from the latitude and longitude 

 groups in the proper octant of the globe, draw 

 a small rectangular box on the map at the proper 

 location. 



Figure 11-15 (A) and (B) shows the RECCO 

 code plotting model for constant pressure charts 

 and actual plotted report. 



Upper Air Chart Analysis 



With the failure of facsimile circuits or 

 in the case of unique situations, the Aerographer's 

 Mate may be called upon to analyze constant 

 pressure charts. In order for them to be able 

 to carry out these duties, it is necessary that 

 they know the vertical structure of highs and 

 lows, frontal positions aloft, and the basic tech- 

 niques of constant pressure chart analysis. 



Upper Air Features 



The surface weather chart depicts pressure 

 systems only in a horizontal extent. The verti- 

 cal extent and orientation of the pressure sys- 

 tems depend on the temperature of the 

 atmosphere. 



The rate of change of pressure with height 

 depends primarily on the temperature. The pres- 

 sure changes most rapidly in a vertical plane 

 when the temperature is low, least rapidly when 

 it is high. Remember that pressure is a func- 

 tion of the weight of the atmosphere, and the 



(A) 



TT 



T d T i 



(B) 



■fff — 



dd 



i-f HHH 



u hhh 

 GGgg 



-5 



-10 



108 

 310 

 0415? 



ABBREVIATED RECCO 

 PLOTTING MODEL FOR 

 CONSTANT PRESSURE CHARTS 



PLOTTED ABBREVIATED 

 RECCO REPORT 



209.289 

 Figure 11-15. — (A) RECCO code plotting model 

 (constant pressure chart); (B) plotted RECCO re- 

 port. 



212 



