The India Meteorological Department (IMD) has issued heavy to extremely heavy rainfall warning for West Bengal, Sikkim, Assam, Meghalaya, Arunachal Pradesh, Kerala, Puducherry, Nagaland, Manipur, Mizoram, Tripura, Odisha and Tamil Nadu for Saturday (June 20). Meanwhile, heatwave is very likely over parts of Bihar, Uttar Pradesh, Goa, Maharashtra and Telangana.