Abstract
For large scale convective activity there should be a combination of the following four favorable conditions-low level convergences, high level divergence, sufficient inflow of moisture in the lower levels and a favorable stability index. The synoptic models producing the above favorable conditions are discussed and the ways of identifying them on the daily working charts are indicated.
 
 Thunderstorms during the monsoon season are caused by the movement of the upper easterly waves. The upper easterly and westerly wave troughs are compared and their relative efficacy in producing thunderstone is commented upon.
 
 Typical synoptic situations of thunderstorm activity in Bombay State during 1959 are given illustrative of raptorial the ideas mentioned in the earlier paragraphs.
 
 Climatologically distribution of thunderstorms and duststorms over India is explained in terms of the four favorable factors mentioned in the beginning.
 
 Finally it is summed up that large scale convective activity occurs anywhere in India and the neighbourhood provided there is a proper combination of these favorable factors.
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