CAIPEEX Phase IV experiment has started on 3rd July 2018 and will be conducted for 120 days, depending on availability of suitable clouds. IITM has established an observational facility and a dual polarimetric C-band radar at NBNSCOE, Solapur, Maharashtra. A seeder and an instrumented research aircraft are being used to seed clouds and record the changes in clouds, leading to rainfall. This is for the first time, such science experiment is being conducted in the convective clouds over the tropics.