Koppu was a C2 tropical cyclone that formed in the Philippine Sea in 2015. The storm reached maximum sustained winds of 185 km/h (100 kt) with a minimum central pressure of 925 hPa. Tracking across the Philippine Seain the Western Pacific basin (, it potentially affected the Philippines, Taiwan and Japan. The storm traveled from approximately 14.4°120.1° to 19.2°148.9°, crossing a range of 5 latitude and 29 longitude.