The India Meteorological Department (IMD) has issued heavy rainfall warning for 13 states/Union Territories for Friday (September 19). According to the IMD's latest bulletin, heavy rainfall is very likely over Andaman & Nicobar Islands, Arunachal Pradesh, Assam, Meghalaya, Bihar, Nagaland, Manipur, Mizoram, Tripura, West Bengal, Sikkim, Tamil Nadu and Puducherry.