TABLES 



113 



Code Table 16 



SYMBOLS "pp" and "ppp. "--Amount of barometric change 



in the last 3 hours 



' When the amount of the barometric pressure change equals or ciceeds 9.9 millibars, the group "9»ppp" should be Inserted in the message following 

 the "D.v^pp" group. The "99" is the group identifier, and "ppp" is the total amount of the pressure change (in tens, units, and tenths of millibars) 

 during the preceding 3 hours. When the group is inserted. "99" should be reported for "pp" in the "D.v,app" group. FortzampU: If the total amount 

 of the pressure change Is 13.4 millibars, the groups should be coded "0.v.a99 99134." If the amotmt is 9.9 millibars, the groupsare coded " D.v,a99 99099." 

 ("DaTaa" should be given appropriate values.) 



