The India Meteorological Department (IMD) issued heavy rainfall warning for several states for September 21 (Sunday). It is very likely over Assam, Meghalaya, Nagaland, Manipur, Mizoram and Tripura. The IMD also stated that thunderstorms accompanied with lightning and gusty winds (30-40 kmph) are very likely over parts of Andaman & Nicobar Islands, West Bengal, Tamil Nadu and Puducherry on Sunday.