ISLAMABAD - A brief and scattered pre-monsoon downpour in twin cities on Monday evening finally ended the prolonged heat wave and mercury that had gone above 46 degrees Centigrade on Monday suddenly dropped to let people have a sigh of relief. According to Met Office Islamabad, the temperature in twin cities did not surge beyond 43 degrees Centigrade on Monday perhaps as a precursor to the pleasant change in the weather. Partial drizzling continued in some parts of Rawalpindi and Islamabad. People came out on roads to enjoy the blessing, which appeared to be a rare opportunity in the wake of persistence of long dry and hot weather. Before the rain shower, a thick layer of clouds blanketed the city for a considerable time. However, the pleasure of the twin cities residents came to an end, as the downpour could not last for long and it ended before most of the people could manage to come out to enjoy it. Even most parts of the twin cities did not receive any rain at all. The rain was not enough to leave any good to bad impact on crops, however it helped in providing immediate relief from the current heat wave as during the past two weeks most of the areas in the country witnessed a sharp increase in temperature, said Director General Pakistan Meteorological Department (PMD) Qamar-uz-Zaman while talking to TheNation. He said, From the first week of July a new rain spell would start that would bring down the temperature in Northern Punjab, however Southern Punjab and Sindh would have to suffer from the heat wave for the next three to four days. According to Pakistan Meteorological Department (PMD), Rawalpindi and Islamabad received rain below 0.5 mm, but according to the forecast the rain would continue off and on during the night and it is also expected that the current spell of rain will continue intermittently till the next 48 hours. This current rain spell would help people a lot as it would bring down the number of patients affected by diseases caused by the heat wave, said Dr Waseem Khawaja Assistant Director PIMS. The excessive heat causes disease like heatstroke, heat cramps and exhaustion and hypertension, he continued. He said that during the last one month around 3,000 patients of gasternoentolgy were treated in Emergency Department of Pakistan Institute of Medical Sciences.