Abstract
The existence of latent instability has been analysed for thunderstorm days accompanied by squall in Calcutta by the parcel method with upper air soundings from Calcutta and Dum Dum. It was found that the total energy up to 250 mb was positive, implying that instability was a necessary condition for thunder-storms. In this analysis entrainment, atmospheric drag and the compensating downward motion in the environment were not considered. The hodographs of wind shear were found to be due to advection. The lifting condensation level, level of free convection and the temperature profiles of the parcel were calculated. They have been discussed in the paper.
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