B5-8 PREPARATION OF CHARTS 
b. Depression. For those levels selected for transmission, sub- 
tract algebraically the dewpoint from the temperature. Enter 
the difference, to the nearest tenth of adegree in the depres- 
sion column. Enter a dash to indicate that the relative humid- 
ity was missing. No entry will be made when the temperature 
is colder than -40.0°C. 
Examples: 14.6 1.2 -1.3 
10.6 -12.6 -6.5 
4. 13.8 .2 
3.3.5 Type of Level Column. This column is used to identify significant 
levels for punching of climatological data. Those stations not required to 
select significant levels for punching will make noentries of any kind in 
the column labeled ''type of level'', since even though these data are not 
required to be entered on-station, it is very possible that this column 
will be used at some future time. 
3.3.6 Rawin Termination Data. The altitude, m.s.l., andthe correspond- 
ing nearest whole mb of pressure, for the last whole minute of ascent for 
which rawin data, direction and speed, are evaluated will be entered in 
red in the Data Block two or three spaces below the termination level of 
the sounding. If no rawin was taken enter three zeros for the pressure 
and five zeros for the altitude. The value for pressure, in whole mbs 
without the tenths figure, will be entered inthe column headed ''mb,"' and 
the value of altitude will be entered in the column headed "Altitude of 
Significant Levels or Remarks." Since altitude data for the rawin are 
obtained from the corresponding radiosonde observation, in no instance 
will the rawin pressure be less than, or the rawin altitude be greater than 
corresponding data for the raob terminating level. Ifa hypsometer radio- 
sonde was used, the terminating rawin pressure will be no greater than 
the last whole mb of raob pressure. Example: Raob terminates at 4.1 
mbs, last whole minute of wind corresponds to 4.4 mbs, 5 mbs will be 
entered as the rawin terminating pressure. 
Figure B5 - 2, Rawin Termination Data 
1-1-69 FMH#3 
