PREPARATION OF CHARTS B5-7 
3.3.2 Temperature. Two entries are required for temperatures at all 
levels except the surface; these are under "ordinate" and "ascent LK Ghie 
a. 
Ordinate. For each upper level enter the corrected ordinate 
reading to tenths as obtained from the recorder record. 
Ascent °C. On the surface level, enter the dry-bulb temper- 
ature to degrees and tenths, as obtained from the ''Surface 
Observation at Release'' block. For each upper level, enter 
the temperature to degrees and tenths, corresponding to the 
temperature ordinate of the level, as obtained from the tem- 
perature evaluator. Prefix a minus sign to the entry on WBAN- 
31A whenever the temperature is colder than 0.0°C. Prefix a 
plus sign to the entry on WBAN-31BandC whenever the tem- 
perature is warmer than 0.0°C. 
3.3.3 Relative Humidity. The two subdivisions under this column are 
“ordinate” and "ascent %." 
a. 
Ordinate. For each upper level enter the corrected ordinate 
reading to tenths as obtained from the recorder record. Enter 
"mM'' if the relative humidity data are missing. No entry will 
be made when the temperature is colder than -40°C. 
Ascent %. On the first line of the columnenter the relative hu- 
midity at the time of release as recordedin ''Surface Observa- 
tion Release" block. The relative humidity at the surface will 
not be computed when the surface temperature is colder than 
-35°F (-37.2°C); a dash will be entered in this case. On the 
line pertaining to each upper level, enter the relative humidity 
as obtained from the evaluator. Enter a dash if the relative 
humidity is missing. No entry willbe made when the tempera- 
ture is colder than -40.0°C. 
3.3.4 Dewpoint. The two subdivisions under this columnare "ascent °C" 
and ''depression." 
a. 
LSS 6Y) 
Ascent °C. Use the dewpoint calculator to compute the data. 
Computation will be made from the relative humidity to whole 
percent and temperature to the nearest 0.1°C pertaining to 
each level. Dewpoint temperatures based on doubtful tempera- 
ture and accurate relative humidity data will be classified as 
doubtful. Enter the dewpoint to the nearest 0.1°C on each level 
which will be transmitted and that has numerical values of 
temperature and relative humidity. Enter a dash to indicate 
that the relative humidity was missing. Noentry will be made 
when the temperature is colder than -40.0°C. 
FMH#3 
