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|Title:||Parameters necessary for the assessment of pre-storm instability|
|Authors:||Patra, A K|
De, U K
|Abstract:||Two parameters and one index have been developed to study the instability in the pre-storm environment. One parameter (ϒ) and index (P) incorporate the effect of thermodynamic and shear environment and emphasize the impact of the lower atmosphere from the surface to the level of free convection (LFC). The other parameter (M) takes into account the role of vertical variation of mixing ratio in the assessment of pre-storm instability. These have been tested with continuous 64 sets of radiosonde observations taken during May 1988 at and around 6-h intervals over DumDum (22.38oN, 88.28oE), Calcutta during pre-monsoon period. These two parameters and the index calculated at a particular time give good information about the pre-storm instability within the next six hours of the time of observation at and around 25 km of DumDum. Finally the results have been verified for both clear and thunderstorm days in the pre- monsoon period for 1987 and it has been found that out of 142 radiosonde observations, only six cases have failed to assess the actual situation.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.27(4) [August 1998]|
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