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

1. From the temperature curve at 5C, extend a dry adiabat downward until it intersects the pressure level of  and read the temperature T₂ at this intersection. We will call this temperature in our example, figure 6-2-19, view A.

2. Calculate the difference between this temperature (T₂₎ and 5C. Call this value A. The difference is or simply

3. From the intersection with the temperature curve, draw a saturation adiabat up-ward to intersect the pressure level where the air temperature is 5C, and read the temperature at this intersection. We will call this temperature T₃ in our example.

4. Calculate the difference between this temperature T₃ and 5C. Call this value B. This difference is or simply

5. Enter figure 6-2-19, view B, with values A and B to find the hail size on the Fawbush-Miller Hail Graph.

6. If your WBZ is above 10,500 feet, enter figure 6-2-20 with the hail size from step 5 and your WBZ height to determine a corrected hail size.

Learning Objective: Describe the computa-tion procedure for contrail formation analysis on the Skew T.

Privacy Statement - Press Release - Copyright Information. - Contact Us - Support Integrated Publishing