Abstract: The weather systems that predominantly affect the north-eastern parts of India during the pre-monsoon summer months (March-May) are severe thunderstorms, locally named as ‘Kalbaishakhi’ or ‘Nor’westers’. The storms are devastating in nature particularly due to strong (gusty) winds, heavy rains and hails associated with it. Although these storms are well known for its power of causing damages, studies on them are relatively few due to their small size and sparse network of observations over the region.