STORM - Severe Thunderstorm: Observation & Regional Modeling Severe thunderstorms are important weather phenomena which impact on various facets of National activities like Civil and Defense operations, particularly Aviation, Space Vehicle Launching, Agriculture, in addition to this, its damage potential to life and property. They occur over different parts of India during different seasons. Forecasting pre-monsoon thunderstorms in peninsular, northeast, and northwest India, particularly, over Gangetic West Bengal and in winter over the Sub-Himalayan belt is a prime necessity. Although thunderstorms belong to cloud scale or meso scale systems, the large-scale or synoptic scale atmospheric processes control their genesis. As no detailed studies were available on this phenomenon, the Atmospheric Scientists of India realized that intensive research both, experimental as well as theoretical have to be undertaken to understand the genesis, development, morphology and dynamics of thunderstorms with a view to develop indigenous modelling capability for its improved prediction in Department of Science & Technology, Govt. of India has launched a National Programme on Severe Thunderstorm: Observational & Regional Modeling (STORM) in 2006. The Department of Atmospheric Sciences, University of Calcutta has been identified as a Lead Institution for DST Supported National Programme “STORM”. Prof. Sutapa Chaudhuri, an executive member of STORM - PIC, has been empowered to conduct the First Pilot Field Experiment – 2006 in collaboration with IMD, IAF & IIT Kharagpur. Twenty three publications in peer reviewed journal and two PhD came out of this project. Total outlay of the project was about Rs. 74 lakhs.