Islamabad: Pakistan Meteorological Department (PMD) here on Friday predicted heavy rain in twin cities of Rawalpindi and Islamabad on Saturday.The areas around Nullah Leh could be affected due to heavy rain, PMD official warned.Chief Meteorologist Dr. Muhammad Hanif told ‘The News’ that Rawalpindi and Islamabad would receive heavy rain on Saturday. Light rain would start on Saturday morning, but heavy showers are likely to start in the night.