ls S(O) 
RELEASE AND RECORDER RECORD B4-13 
temperature that is not supported by the lapse rate of the trace 
immediately preceding, the terminating level will be placed at 
the point where the marked increase begins; this phenomenon 
should not be confused with explosive warming(see Fig. B4-9), 
When the radiosonde ascends beyond the last printed calibra- 
tion contact, the sounding will be terminated at a pressure 
corresponding to this contact. This contact willbe considered 
as the highest usable point of the calibration chart. "Chart 
Limitations'' will be used as the reason for termination. Do 
not attempt to extrapolate the baroswitch or hypsometer cali- 
bration beyond the last printed contact. 
(WB) At 5 millibars which will be the terminating level on the 
adiabatic chart when the pressure is derived from baroswitch 
data. When the flight continues to altitudes higherthan 5 mb., 
continue the selection of levels in accordance with applicable 
requirements. Enter the evaluated data from these levels in 
the data block on WBAN-31C, but do not plot the data on the 
adiabatic chart or enter it in the CPD blocks. 
At the beginnings and endings of strata: 
1. whose temperature is classified as missing or doubtful. 
2. whose humidity is classified as missing provided the 
strata of missing humidity extends over more than50 mb 
(see JB4-7.5.2(c)). 
3. a combination of (1) and (2). 
On the levels bounding both missing humidity and temperature 
enter ''Begin (or End) missing data.'' On the levels bounding 
doubtful temperature enter ''Begin (or End)doubtfultemp.' On 
the levels bounding missing relative humidity only, enter 
"Begin (or End) missing RH." This notation will be made close 
to the evaluated data but in a position where it will not inter- 
fere with or obliterate any part of the record or the evalua- 
tions. 
Within each stratum whose humidity and temperature are both 
classified as missing. Since it will notbe possible to evaluate 
data pertaining to such levels, the exact points at which the 
levels are placed are unimportant, butitis necessary that they 
be assigned a level number to aidin constructing the adiabatic 
chart and coding the raob message. For these purposes, only 
one level will be placed within each stratum of data classified 
as missing. Enter "Missing Data" on these levels. 
FMH#3 
