The India Meteorological Department (IMD) has issued heavy to very heavy rainfall warning for 18 states/Union Territories for Friday (September 12). It is very likely over Arunachal Pradesh, Nagaland, Manipur, Mizoram, Tripura, Assam, Meghalaya, Bihar, Chhattisgarh, Andhra Pradesh, Maharashtra, Karnataka, Odisha, West Bengal, Sikkim, Telangana, Uttar Pradesh and Uttarakhand.