A tropical depression developed east-northeast of Guam on August 2. At 21:00 UTC on the same day, the JTWC began tracking the system, giving it the identifier 17W. 17W intensified into a tropical storm on August 3, with the JMA assigning it the name Shanshan. The storm was located over a favorable environment as the system was gradually consolidating, and it intensified into a severe tropical storm on August 3. During the next day, both the JMA and JTWC upgraded Shanshan to a typhoon after deep convection was seen wrapping into its developing center. The JMA later analysed that the storm had peaked in intensity with 10-minute winds of and a minimum pressure of 970 hPa, remaining that intensity for several days. The JTWC stated that Shanshan had slightly weakened after a strengthening trend by August 6 after its eye became ragged and slightly displaced. On August 7, Shanshan began to re-intensify and reached its peak strength as a Category 2 typhoon with 1-minute winds of while nearing southeastern Japan. Thereafter, Shanshan began to change its course towards the east as it rapidly weakened. The JTWC issued their final advisory on August 9, though the JMA tracked the system until it became extratropical at 06:00 UTC on August 10.
