Shanshan turned west-northwestward and stalled near Kikaijima, reaching its peak intensity with ten-minute sustained winds of 175 km/h (110 mph) and a central pressure of 935 hPa (27.61 inHg).

Shanshan turned northward between two mid-level subtropical ridges and made landfall near Satsumasendai in Kagoshima Prefecture around 8 a.m. local time on August 29.

Shanshan's convection has slightly increased over the past six hours as its circulation moved back over open water and began progressing east-southeastward due to interaction with a mid-latitude trough.

[3] The origins of Typhoon Shanshan can be traced back to August 20, when the Japan Meteorological Agency (JMA) reported that a tropical depression had formed near the Mariana Islands.

[4][5] At midnight on August 21, the United States Joint Typhoon Warning Center (JTWC) upgraded the tropical depression, designating the system as 11W due to deep convection beginning to consolidate into a central dense overcast.

[6][7] Shortly after, the depression intensified into a tropical storm and was named Shanshan by the JMA due to low vertical wind shear, warm sea surface temperatures, and high ocean heat content.

[9] A ragged eye-like feature appeared on satellite imagery on August 23,[10] and early the next day, both the JMA and the JTWC upgraded it to a minimal typhoon.

[12][13] Despite its medium size, it quickly organized and developed a pinhole eye on satellite imagery, with deep convection wrapping around an obscured low-level circulation center.

[22] Shanshan completed its eyewall replacement cycle on August 27 and began rapidly intensifying again,[23] featuring a symmetric eye with a diameter of 29–35 miles (46–56 km) while stalling near Kikaijima, surrounded by cold cloud tops at −94 °F (−70 °C).

[26] A study by Imperial College London suggests that Shanshan's extreme winds and heavy precipitation were strengthened by climate change.

[27] After reaching its peak intensity, the typhoon's structure further decayed on August 28, becoming cooler and less defined, which coincided with a warming of the eyewall cloud tops as it moved through the Ryukyu Islands.

[28] Shanshan then turned northward between two mid-level subtropical ridges and made landfall near Satsumasendai in Kagoshima Prefecture around 8 a.m. local time on August 29.

[31] After the system made landfall, satellite imagery and radar loops showed the rapid erosion and disintegration of convective tops and feeder bands.

[39] On September 1, Shanshan re-intensified into a weak tropical depression with 25 km/h (16 mph) winds and a well-defined circulation in the eastern semicircle, leading the JTWC to resume advisories as it drifted poleward along the northwestern edge of a low to mid-level subtropical ridge.

[59] In Yakushima, where maximum gusts of 105 miles per hour (169 km/h) were recorded in the evening of August 28, a 3,000-year-old Yakusugi cedar tree named the Yayoi-sugi (弥生杉) was blown down.

[59] Due to the typhoon's slow movement, a linear precipitation zone developed over Kagoshima, Miyazaki, and Oita prefectures, resulting in prolonged torrential rainfall across the region.

[63] Heavy rainfall in Oita Prefecture resulted in the overflowing of the Miyakawa River in Yufu, which prompted the issuance of a Level 5 emergency warning, affecting 2,311 residents.

[64] In Aichi Prefecture, the city of Gamagōri observed record breaking rainfall amounts as Shanshan neared Japan on August 26 and 27,[65] resulting in a mudslide that killed three people and injured two others.