These computations for the horizontal length in
degrees and altitude in degrees are used on the graph in
figure 5-10, and for the forecast of hailstone diameter.
EXAMPLE OF TECHNIQUE.— In the sounding
shown in figure 5-9, the CCL is point A. The moist
adiabat from the CCL to the pressure level, where the
temperature is -5°C, is the line AB´. The isobar from
the point where the air temperature is –5°C to its
intersection with the moist adiabat is the line BB´. The
dry adiabat from the isobar BB´ through the triangle to
the pressure of the CCL is the line HH´. The base of the
triangle in degrees Celsius is 6°C (from plus 1 to minus
5). The length of the dry adiabat through the triangle is
21°C (from minus 4 to plus 17).
EVALUATION.— The value on the graph in figure
5-10, with a horizontal coordinate of 6 and a vertical
coordinate of 21, is a forecast of 1-inch hail.
Figure 5-10.-Fawbush-Miller Hail Graph showing forecast hailstone diameter in inches.
5-14
