Typhoon Khanun was barreling through the Pacific days after an earlier tropical cyclone, Doksuri, brought death and destruction to the region.

A powerful tropical cyclone was approaching islands in southern Japan on Tuesday, days after another one slammed into mainland China and the Philippines and left dozens of people dead or injured across the region.

The new storm, Typhoon Khanun, was less than 200 miles southeast of a major United States military base in southern Japan’s Okinawa Prefecture on Tuesday, according to the United States military’s Joint Typhoon Warning Center in Hawaii.

Khanun was producing maximum sustained winds of 138 miles per hour, making it the equivalent of a Category 4 storm on the five-category wind scale that meteorologists in the United States use to measure Atlantic hurricanes. (Tropical cyclones are called hurricanes in the Atlantic and typhoons in the northwestern Pacific.)

Japan’s official forecast showed the storm heading northwest toward mainland China later in the week. But the meteorological authorities in China said that it might turn further north and head for Japan’s major islands instead.