BERLIN—Storms caused heavy flooding across parts of western and central Europe overnight, with one man missing after being swept away by a raging stream in eastern Germany. Firefighters resumed their search for the man in Joehstadt, in Saxony state, on Wednesday morning. German news agency dpa reported that he had been trying to secure his property from rising waters when he disappeared. Hof county near the eastern border with the Czech Republic issued a disaster alert late Tuesday as basements filled with water, trees were uprooted and some areas lost power overnight. Germany’s DWD weather service said the region saw 80 liters of rain per square meter (3.1 inches) in the space of 12 hours. In Hagen, firefighters had to rescue several drivers whose vehicles had become stuck in a flooded underpass. Videos on social media showed streets in the western city knee-deep in water and others buried by landslides. …