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Displaced Temperature at Upper Limit of Continuous 
Temperature Trace 
7.11 Determining Chart Changeover Temperature in Continuous Tem- 
perature Trace. If a continuous temperature trace commences before 
and extends through the 500-400 mb, 125-100 mb, or 12.5-10 mb, deter- 
mine the chart 
as follows: 
changeover temperature, i.e., 400 mb, 100 mb, or 10 mb, 
a. When the continuous temperature trace extends through the 
500- 
(1) 
(2) 
(3) 
(4) 
(5) 
400 mb stratum; 
Trim a blank WBAN-31B along its 400 mb isobar, 
Align this auxiliary chart with the 400 mb isobar of 
WBAN-31A, 
Plot the upper bounding level of the continuous temper- 
ature trace on the auxiliary WBAN-31B, 
Evaluate the temperature trace and select the 400 mb 
temperature, 
Discard the auxiliary WBAN-31B. 
b. If the continuous temperature trace extends through the 125- 
100 mb stratum; 
1-1-69 
FMH#3 
