

Computation of Hail Size This method of computing hail size is based on the estimates of updraft and downdraft velocities in thunderstorms and the resulting probabilities of hail produced in a thunderstorm Figure 6218.Surface hail prediction diagram. reaching the surface. This technique is called the FawbushMiller Hail Forecast method. The procedure to calculate hail size is as follows: 1. From the temperature curve at –5°C, extend a dry adiabat downward until it intersects the pressure level of and read the temperature T_{2 }at this intersection. We will call this temperature in our example, figure 6219, view A. 2. Calculate the difference between this temperature (T_{2)} and –5°C. Call this value A. The difference is or simply Figure 6219.Surfacehailsize calculation: (A) Calculation example, (B) hail size graph. 3. From the intersection with the temperature curve, draw a saturation adiabat upward to intersect the pressure level where the air temperature is –5°C, and read the temperature at this intersection. We will call this temperature T_{3} in our example. 4. Calculate the difference between this temperature T_{3} and –5°C. Call this value B. This difference is or simply 5. Enter figure 6219, view B, with values A and B to find the hail size on the FawbushMiller Hail Graph. 6. If your WBZ is above 10,500 feet, enter figure 6220 with the hail size from step 5 and your WBZ height to determine a corrected hail size. Learning Objective: Describe the computation procedure for contrail formation analysis on the Skew T. 
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