Much of Southern Europe remained in the grasp of sweltering heat on Friday, as forest fires continued to blaze in a number of spots. For large parts of Greece, for example, meteorologists are expecting a long heatwave that will last until the beginning of August. The mercury in Athens had already climbed to 30 degrees Celsius early on Friday morning. At the weekend and in the days thereafter, temperatures are expected to reach around 40 degrees, according to the Office of Meteorology. The civil defence force warned that the danger of fire was extremely high. Even at night, temperatures in many…