Alberta Hailstorms by A. J. Chisholm, Marianne English (auth.)

By A. J. Chisholm, Marianne English (auth.)

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1356 (see Chisholm, 1970a), each displays essentially the same features exhibited by Figs. 39, 40 and 41 at 1356 MST. As mentioned previously, this storm was similar in format to Phase II of the storm of 28 July 1968. But it differed from this storm in the following manner: (i) Figs. 39-41 show that the EWER and Ze maximum were of similar horizontal dimension, but the Ze maximum was displayed to the left and downwind of the EWER. In contrast to Phase II of the storm of 28 July 1968, the storm top was displaced downwind of the low-level location of the EWER.

Tech. Note No. 5, Contract AF61 (052)-254, Dept. of Meteorology, Imperial College, London, 109 pp. ~-, and ~-, 1962 : Airflow in convective storms. Quart. J. Roy. Meteor. , 88, 117-135. ~-, and R. ]. Donaldson, 1963: Airflow and structure of a tornadic storm. J. Atmos. , 20, 535-545. Byers, H. , and R. R. Braham, 1949: The Thunderstorm. Govt. Printing Office, Washington, D. , 287 pp. Chisholm, A. , 1970a: Alberta hailstorms: A radar study and model. D. thesis, McGill University, 237 pp. FIG. 54.

WIND -20 COMPONENT -10 0 RELATIVE TO +10 +20 STORM J. 27 CHISHOLM (m sec-1) 12 ~ 10- w ~ <( .... :X: "'Ui :X: 4 2 4 6 10 12 14 16 18 HORIZONTAL DISTANCE (km) FIG. 35. Schematic airflow in the plane of storm motion, for Phase III, 28 July 1968, superimimposed on the radar vertical cross section taken along line AB of Fig. 34. Wind components relative to the storm are shown. The storm airflow enters cloud base tilting upwind but this trend reverses so that the storm top lies almost directly above the center of the cloud base updraft.

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