A radar study of premonsoon thunderstorms (Nor'westers) over Gangetic West Bengal
Development of premonsoon thunderstorms around Calcutta during 1955 and 1959 has been studied with the help of a high-powered storm detecting radar with P.P.I., R.H.I. and 'A' scopes at Dum Dum airport (Calcutta). The location' and type of the initial formation of the radar echoes and their subsequent development into line-type echoes and directions of movement have been discussed, the characteristics of the thundersqualls which reached Dum Dum have also been studied in relation to the corresponding radar observations and results so obtained have been summarised. Stronger squalls are apparently produced from Ob clouds with greater vertical growth.
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