Heatwave is likely to abate over Delhi and adjoining parts of northwest and central India from Monday, the India Meteorological Department (IMD) said today. The weather office has predicted partly cloudy sky with the possibility of thunder development at isolated places over Delhi, Himachal Pradesh, Punjab, Haryana-Chandigarh, east Rajasthan and parts of Uttar Pradesh from tomorrow, which is likely to give some respite to residents from the scorching heat.