 First noted as an area of poorly organized thunderstorms near Guam on September 19, the disturbance moved westward across the northern Philippine Sea. As an upper tropospheric cyclone weakened east of Luzon on September 22, upper level conditions improved, but no reflection at the surface was yet witnessed. The thunderstorms entered the South China Sea on September 23 while a lee side surface low formed along the monsoon trough west of Luzon due to the strong easterly low-level flow. The disturbance rapidly consolidated, and it became a tropical depression early on September 24. Slowly intensifying as it moved west-northwest, Lynn became a tropical storm on September 25. At this point, the storm track became west-southwesterly and upper level winds began to shear thunderstorms north of the center. Weakening ensued, and Lynn struggled to maintain tropical storm intensity as it made landfall about 95 kilometres (59 mi) southeast of Da Nang, Vietnam. The depression then turned northwest and dissipated near the Vietnam / Laos border early on September 28.
