The IMD has issued heavy to extremely heavy rainfall warning for 21 states/UTs. It is very likely over Karnataka, Kerala, Tamil Nadu, Puducherry, Andaman & Nicobar Islands, Goa, Maharashtra, Arunachal Pradesh, Assam, Meghalaya, Bihar, Andhra Pradesh, Gujarat, Lakshadweep, Nagaland, Manipur, Mizoram, Tripura and Telangana on Sunday and Monday. Uttarakhand and Odisha may witness it on Sunday.