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Hail Size Forcasting
Tornadoes

Aerographers Mate 1 & C
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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







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