B4-8 RELEASE AND RECORDER RECORD 
4.6 Surface Wind. Enter direction in digit form to the nearest 5 de- 
grees (5, 30, 245) and speed to the nearest whole meter per second (4, 
23, 109) on WBAN-31A. When the wind is calm, enter ''0" for the di- 
rection and "0" for the speed. 
4.7 Clouds and Weather. The clouds and weather will be entered on 
WBAN-31A. 
4.7.1 Clouds. When clouds are not present, enter ''Clear.'' When clouds 
are present, enter the amount, and type in accordance with instructions 
in the Federal Meteorological Handbook No. 1 (Surface Observations), 
e.g., 10 As. The total amount may exceed ten-tenths when pilots' re- 
ports or frequent observations indicate the extent or existence of cloud 
layers above lower layers. 
4.7.2 Weather. Use the same symbols for recording weather as those 
employed in the Federal Meteorological Handbook No. 1 (Surface Ob- 
servations) for similar entries. 
4.7.3 Entry of Raob Balloon Into Base of Clouds. Whenever requested, 
observe the entry of the raobballoon into the base of any clouds that may 
be present. The observer at the recorder will mark on the recorder 
record the point of the balloon's entry into the cloud layer. 
4.8 Identification Stamp. Enter the name of the station, the date and 
time of release GMT, the ascension number, the radiosonde serial num- 
ber, the reason for termination of the observation, and the names of the 
computer and verifier. Place the stamp within the first seven inches of 
the recorder record so as not to interfere with the baseline-check. The 
left edge of the stamp should be at approximately the ten ordinate line. 
5. The Recorder Record. The task of the observer atthe recorder is 
to obtain an accurate and continuous recording ofthe signal transmitted 
by the radiosonde. As the radiosonde moves away from the earth's sur- 
face, the radiofrequency usually drifts slightly, making itnecessary for 
the observer to retune occasionally. Ground equipment with automatic 
frequency control usually will not require manual retuning during a 
sounding. The observer at the recorder willevaluate as much of the re- 
corder record as possible while the balloonis ascending. The remainder 
will be completed as soon as possible after the termination of the flight. 
5.1 Setting Low Reference. As each low reference is recorded, first 
note that the receiver is properly tuned and that the trace is being re- 
corded clearly. Then, if required, adjust the low reference to 95.0, 
making sure that this adjustment is completed and a portion of the 
T=1=69 FMH#3 
