NEW DELHI, April 20 -- Heatwave conditions are very likely to prevail over isolated pockets of northwest, central and the adjoining parts of east India for the next four to five days, the India Meteorological Department (IMD) said on Monday. It said isolated pockets of Haryana, Chandigarh, Delhi, Punjab, East Rajasthan, Vidarbha, Chhattisgarh, West Uttar Pradesh, West Rajasthan, Madhya Pradesh, Gangetic West Bengal, Jharkhand, Odisha and scattered pockets of East Uttar Pradesh are expected to witness heatwave conditions on different dates between April 20 and April 25. "Hot and humid weather conditions are very likely to prevail in isolated pockets over Gangetic West Bengal during April 20-26; Tamil Nadu, Puducherry and Karaikal during Apri...