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Alberta Hailstorms pp 37–98Cite as

Alberta Hailstorms Part II: Growth of Large Hail in the Storm

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Part of the book series: Meteorological Monographs ((METEOR,volume 14))

Abstract

The growth of hail in four different storms has been modeled successfully by a single procedure.

Using analyses (by others) of radar data, cloud photographs and aircraft measurements, a two-dimensional cloud model characterized by a sloping updraft is derived. Assuming the existence of a few millimeter-sized embryos in the lower levels of the updraft, the subsequent growth and motion of these embryos is calculated. For each of the four storms, the calculations result in hail sizes that agree well with observed sizes, liquid fractions that are reasonable, growth times and radar reflectivities that are compatible with radar observations, and growth layers (i.e., “rings”) that are consistent with the observed internal structure of hailstones.

Hailstones with masses up to 70 gm were collected from the four storms. The largest stones were all markedly aspherical and had very irregular surface structures; these factors were considered in the calculations. For example, an oblate hailstone can grow to 70 gm in one up-and-down trajectory in 25 min (only 10 of which need to be spent in intense updraft).

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    Marianne English

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English, M. (1973). Alberta Hailstorms Part II: Growth of Large Hail in the Storm. In: Alberta Hailstorms. Meteorological Monographs, vol 14. American Meteorological Society, Boston, MA. https://doi.org/10.1007/978-1-935704-32-4_2

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  • DOI: https://doi.org/10.1007/978-1-935704-32-4_2

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