On August 13, the JMA started to monitor a tropical depression that had developed, about 685 km (425 mi) to the southeast of Hagåtña, Guam. Behind Goni was another deppresion. It later became super typhoon Atsani, in which they became the “double-threat” pair of typhoons. By the next day, the depression started to organize and was designated as 16W by the JTWC. Several hours later, deep convection had improved and has covered its LLCC and both agencies upgraded 16W to a tropical storm, naming it Goni. During the night of August 15, the JMA upgraded Goni to a severe tropical storm as windshear started to calm whilst deep convective banding wrapping into its circulation. By the next day, satellite imagery depicts a developing eye with an improved tightly-curved banding which upper-level analysis reveals that low shear and an improving environment. Goni intensified into a typhoon by both agencies a few hours later.
Early on August 17, satellite imagery depicted a small-pinhole eye as Goni underwent rapid intensification and was upgraded rapidly to a Category 4 typhoon and reached its first peak intensity. Slightly thinning convective banding and low to moderate wind shear caused Goni to weaken to a Category 3 typhoon. Goni maintained that intensity while moving westward and entered the Philippine Area of Responsibility which PAGASA gave it the local name Ineng, until on August 19, Goni entered an area of favorable environments. Goni had maintained an overall convective signature with tightly-curved banding wrapping into a 28 nautical-mile eye. The JTWC later re-upgraded Goni back at Category 4 typhoon status early on August 20 as it neared the northeastern Philippine coast. Rapidly weakening soon after, Goni executed a sharp north turn. Then as it turned northeastwards, Goni re-intensified for the third time into a Category 4 typhoon mid-day on August 23.
Typhoon Goni quickly passed through Uki, Kumamoto after 20:00 UTC and made landfall over Arao, Kumamoto after 21:00 UTC on August 24 (06:00 JST on August 25) The system arrived in the Sea of Japan as a typhoon early on the next day and weakened into a severe tropical storm at 09:00 UTC. Goni moved northeast then transitioned into extratropical cyclone, as the JTWC and JMA issued their final advisories. Goni’s remnants later affected Northeast China and Russia.
