Premonsoon thunderstorms in Assam and synoptic conditions favourable for their occurrence
Synoptic features associated with development of thunderstorms during premonsoon season In Assam have been studied with a view to finding out the most favourable factors contributing, to genesis of such storms. It is found that a particular orientation of the seasonal trough line causing increased incursion of moist, air from the Bay of Bengal into Assam are~ in the lower levels constitutes an essential condition, while existence of upper divergence over Assam provides additional favourable condition for occurrence of thunderstorms. The hours of occurrence of premonsoon thunderstorms in Assam and the characteristics of associated squalls have also been examined.
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