B4-24 RELEASE AND RECORDER RECORD 
of a cloud. The stratum above a cloud, especially one caused 
by convection, is recognized as having a steep temperature 
gradient. While the instrument is in the cloud, the thermistor 
may pick up some moisture. Immediately, as entry into drier 
air takes place, some evaporation of the moisture from the 
thermistor occurs. Therefore, the cooling caused by evapor- 
ation, together with the increase of the lapse rate immediately 
above the cloud, undoubtedly produce this type of "super". 
b. Explosive Warming. During the winter months at some sta- 
tions between 25° and 70° north latitude excessive warming at 
approximately 20 mb and above is occasionally encountered. 
This phenomenon has been termed "explosive warming". 
Characteristics of this may show up at a station for about 36 
hours. Changes of 20-30°C in a very shallow stratum can be 
expected when this condition exists. (Do not mistake this phe- 
nomenon for a battery failure, which affects both temperature 
and references, or some other instrumental malfunctioning.) 
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mann 
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relat ia | E 
Figure B4 - 9. Explosive Warming 
7.10 Continuous Temperature Trace. Whenever the radiosonde fails to 
switch from temperature so that the pressure-contact values cannot be 
determined, and then switches again, so that the pressure-contact values 
are again definitely identified, the pressure for significant temperature 
levels will be determined as indicated in (e) below. Whenever this occurs 
1 Li3g FMH#3 
