New Delhi, April 3 -- The mercury was expected to touch 39-40degC in Delhi over the next few days as day temperatures were set to increase across northwest India by 3-5degC over the next week, the India Meteorological Department (IMD) said on Wednesday. The maximum and minimum temperatures have been in the range of 34-36degC and 14-17degC in Delhi. Private forecaster Skymet Weather vice president (climate and meteorology) Mahesh Palawat said dry and westerly winds were expected in Delhi and the northwestern region. "Wind speed is also expected to be low. Solar insolation will be high. So together, we can expect a gradual increase in temperatures in the entire northwestern region."...