IMD has issued heavy to extremely heavy rainfall warning in 20 states/UTs. It's likely over Goa, Karnataka, Maharashtra, Andaman & Nicobar Islands, Arunachal Pradesh, Assam, Meghalaya, Gujarat, Kerala, Lakshadweep and Uttarakhand on Friday and Saturday. Chhattisgarh, WB and Jharkhand may witness it on Thursday, while Nagaland, Manipur, Mizoram, Tripura, TN and Puducherry may witness it on Friday.