On forecasting hailstorms by the method of vectorial wind changes
The conditions leading to the occurrence of a number of hailstorms over northwest India have been investigated, The method of assessment of convergence by using 24-hour vectorial wind changes was found in these situations .be superior to the conventional methods and of definite prognostic value. The border region between cyclonic and anticyclonic wind shear patterns was found suitable for thunderstorm development whenever the cyclonic shear appeared in a moist air stream, notwithstanding the unfavourableness of the winds and of the thermal structure aloft. Strong upper winds and a pronounced vertical shear are found to promote transformation of the thunderstorms so formed into hailstorms. The direction of the associated squall, if any, lies close to that of the isellobaric wind.
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