Accession Number : AD0666934

Title :   ALBERTA HAIL STUDIES 1966,

Corporate Author : MCGILL UNIV MONTREAL (QUEBEC) STORMY WEATHER GROUP

Personal Author(s) : Chisholm,A. J. ; English,Marianne ; Hitschfeld,Walter ; Pell,J. ; Thyer,N. H.

Report Date : MAY 1967

Pagination or Media Count : 83

Abstract : A new method is presented for evaluating double theodolite pibals, using all four theodolite angles to locate the most likely position of the balloon. The calculation may be done graphically, once a special chart has been compiled, so straightforward calculations of wind are possible without use of a computer. Pell: Although some storms may generate hail continuously, in the manner of the Wokingham storm of Browning and Ludlam, there are cases of storms which produce intermittent hailswaths disrupted by patches of only rain. Closely related to the problem of swath continuity is that of continuity of hailfall at a point. Again, reports have been recorded which indicate that frequently hail falls in 'bursts' separated by periods of either rain or no precipitation at all. Chisholm: A study of radar echo maxima in two Alberta hailstorms has shown that the storms consisted of several storm 'families', each containing small intense radar echo 'cores' or cells. These cells developed preferentially on the right flank of the family, moving across the track of the family at an acute angle to dissipate near the left flank; identifiable lifetimes of the cells were 20-30 minutes. There appeared to be a cycle of development of the cells, which had a considerable effect on the overall storm-family velocity. (Author)

Descriptors :   (*HAIL, CANADA), STORMS, ATMOSPHERIC PRECIPITATION, TEMPERATURE, INTENSITY, DISTRIBUTION, WIND, METEOROLOGICAL RADAR, WEATHER, MATHEMATICAL ANALYSIS, RADIOSONDES, GRAPHICS, METEOROLOGICAL CHARTS

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE