B4-18 
RELEASE AND RECORDER RECORD 
or less in extent) the missing traces may be ignored and the 
humidity data will be regarded as accurate through the stra- 
tum, and evaluated by linear interpolation between the bound- 
ry points. When both temperature and relative humidity data 
of a stratum are classified as missing, the relative humidity 
will be regarded as missing through the stratum, even 
though it is 50 mb or less in extent. 
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Figure B4-6. Abnormal Hygristor Action. During a flight thru precipi- 
tation the hygristor may fail. The failure would be indi- 
cated first as an unsteady humidity trace and then would 
record unusually high humidity throughout the remainder 
of the flight. 
The lower limit of measurable relative humidity is approxi- 
mately 10 percent throughout the temperature range of the 
carbon hygristor and the upper limit is 100 percent. When 
there is no obvious malfunctioning of the radiosonde and the 
indicated relative humidity exceeds 100 percent by three ordi- 
nates or less, the relative humidity will be regarded as 100 
percent and used for all purposes as an accurate value. 
FMH#3 
