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Title: Role of a surface parameter on premonsoon thunderstorm days at DumDum (22.38°N, 88.28°E), Calcutta
Authors: Patra, A K
De, U K
Issue Date: Jun-1997
Publisher: NISCAIR-CSIR, India
Abstract: Occurrence of premonsoon thunderstorms striking DumDum, Calcutta, over a 12-year period has been studied based on a surface parameter (S) developed from surface observations at 0830 IST only. It has been found that on thunderstorm days the value of S in general lies between 1.00 and 1.60. It has also been found that 59.9% of premonsoon thunderstorms are of northerly type and 35.4% of southerly type. Nearly one-half of northerly developments are associated with wind squall, but in the case of southerly developments the wind squall association is only one-fifth. Southerly thunderstorms with wind squalls have almost a linear relationship between the parameter S and the time of occurrence. Moreover, south-easterly developments with squalls are more moist, have large wind speed of squall and occur early compared to the south-westerly developments with squalls.
Page(s): 121-125
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.26(3) [June 1997]

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