The IMD has issued heavy rainfall and dense fog warnings for several states/UTs. Heavy rainfall is likely over Andaman and Nicobar Islands on Thursday and over Tamil Nadu and Puducherry on Saturday. Dense fog conditions are likely over Punjab, Haryana, Chandigarh, Delhi, UP, Rajasthan, MP, WB, Sikkim, Odisha, Assam, Meghalaya, Nagaland, Manipur, Mizoram and Tripura over next three days.