The India Meteorological Department (IMD) has issued heavy to very heavy rainfall warning for 20 states for Monday (September 15). It is very likely over Arunachal Pradesh, Assam, Meghalaya, Bihar, Goa, Maharashtra, Chhattisgarh, Uttar Pradesh, Jharkhand, Madhya Pradesh, Nagaland, Manipur, Mizoram, Tripura, Karnataka, Odisha, West Bengal, Sikkim, Telangana and Uttarakhand.