Abstract
In an article contained in Geophysical Monograph No. 5, H. Dessens concludes, as the result of experiments conducted in southern France, that the presence of a jet stream at upper levels is the factor which transforms a thunderstorm into a destructive hail storm and that large shears in vertical-wind speeds are conducive to formation of hail. The writer, by climatological analysis of hail and upper-air wind data for the contiguous United States, shows that Dessens' theories do not apply to conditions in the United States.

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