A comparative study of hailstorms in Switzerland, Canada and South Africa

✍ Scribed by Admirat, Pierre ;Goyer, Guy G. ;Wojtiw, Lubomir ;Carte, Ernest A. ;Roos, Danie ;Lozowki, Edward P.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1985
• Weight: 896 KB
• Volume: 5
• Category: Article
• ISSN: 2314-6214
• DOI: 10.1002/joc.3370050104

✦ Synopsis

A comparison of 5 to 20 years of qualitative and quantitative observations of hailfalls and hailstorms by three of the most active hail research groups in the world, shows very similar characteristics in a number of aspects of the hail phenomenon. The main similarities are that (a) the frequency of hailstorms decreases with increasing intensity, (b) the characteristics of hailstones (maximum size, number density) and hailswaths (length, surface area, energy) increase with increasing hailstorm intensity (i.e. lifetime, volume), (c) the single and multi-cellular type storms are most frequent, whereas the supercell is rare, (d) the hail flux is not constant but pulsating, (e) the spatial structure of large hailswath is not uniform but contains 'hailcores' and (f) the post embryonic trajectories of common hailstones are often simple and similar.

A number of differences are also observed between some of the regions, the main ones being (a) the upper limit of intensity of the more severe storms, (b) the succession and scale of cells in the storm development and (c) the percentage of various embryo types.

A major conclusion of this comparative study is that the severe hailstorms, which cause most of the damage, are exceptional and show little similarity in the three regions. For the more requent light and moderate damaging ones, the study suggests that dynamics may be the result of pulsating phenomena.