The IMD has issued heavy rainfall and heatwave warning for several states for Monday (May 18). Heavy rainfall is very likely over Andaman & Nicobar Islands, Assam, Meghalaya, Kerala, Puducherry, Karnataka, West Bengal, Sikkim and Tamil Nadu. Heatwave is very likely over Haryana, Chandigarh, Delhi, Madhya Pradesh, Punjab, Rajasthan, Uttar Pradesh and Maharashtra.