Typhoons triggered landslides across Southeast Asia and inundated Shanghai. A slow-moving storm, unusual for this time of year, sent a deluge over Central Europe. Months of floods wore on in northern and central Africa as rain continued to fall on landscapes that are normally more arid. And in the United States, a tropical system too disorganized to become a named storm nonetheless poured historic rainfall on the Carolinas, with more than 20 inches landing in some spots.