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GR2Analyst's volume reflectivity display can be used to analyze the development of hail cores in a storm cell. These cores form above the freezing level, which is typically 10,000 ft or more in altitude. We want to look for 60 dbz regions above the freezing level. To do this, we switch to a hail detection volume alpha table that makes 60+ dbz fully opaque and has a semi-transparent "halo" of 50 dbz to let us see the overall shape of the cell.

Now it is clear that there were two hail cores in the still image and that's what produced the unusual shape. The first one was generated by a large updraft that shot straight up to a peak of 40,000 ft and then descended straight down. The strange "fist" shape on the right in the original still image was actually a second hail core under development. It was formed by a very strong, tilted updraft. The 60 dbz region followed an almost ballistic path, as if shot out of a cannon. With the extra information retrieved from the volume animation, we can predict when and where the "ballistic" hail core will hit the ground. Our prediction would be proven correct in this case, as large quantities of 1-2" hail fell in the area where the second core landed. In general, it takes two or three volume scans (10-15 minutes) for a hail core to reach the ground.

 

 

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