Thunderstorm being one of the deadliest hazards of the North East (NE) part of India an attempt is made, in this brief report to identify the sources of precipitation which act as one of the main controlling forces in triggering these events. Starting with seasonal occurrence preference of thunder activity over the study zone, the report highlights all possible sources associated with the generation of precipitation of the zone. Out of three windows through which humid air enters this region, the paper shows that most effective windows in this regards are west one through which aerosol laden precipitation from flows to the region along the Sub Himalayan terrain and the other effective window is in the south west, carrying hot humid air from Bay of Bengal. Utilizing Aerosol Optical Depth (AOD) parameter from MODIS and aerosol backscattering / extinction coefficient from LIDAR of Guwahati and precipitation data from satellite, the paper presents that aerosol entering through west China is one of the sources for the growth of suitable Cloud Condensation Nuclei during vernal equinoxial months a season that favors development of thunderstorm, in presence of warm humid air parcel from Bay Of Bengal (BOB). However the relevant other parameters like vertical shear, magnitude of CAPE of lower troposphere, are not dealt here and will be taken up for analysis as future course of study.
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Devi et al. (2016) studied this question.
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