The IMD has issued heavy to extremely heavy rainfall warning for 20 states/UTs for Thursday (September 4). It is very likely over parts of Gujarat, Rajasthan, Goa, Maharashtra, Madhya Pradesh, Arunachal Pradesh, Assam, Meghalaya, Chhattisgarh, Karnataka, Haryana, Chandigarh, Delhi, Kerala, Puducherry, Nagaland, Manipur, Mizoram, Tripura and Uttarakhand.