On August 31, a slightly weakened Prapiroon made landfall in North Korea and quickly tracked across the Korean Peninsula, before transitioning into an extratropical cyclone in the Sea of Japan on September 1; the system dissipated east of Hokkaido three days later.

After some organization,[1] the Japan Meteorological Agency (JMA) declared the area of disturbed weather to have assumed the characteristics of a tropical depression at 1800 UTC on August 24.

Strengthening continued at a steady pace thereafter, and at 1800 UTC the following day, the JMA upgraded the depression to tropical storm status, based on corresponding ship reports and satellite intensity estimates, and named the system Prapiroon accordingly.

[1] In response to steering wind currents induced by a nearby, strengthening high-pressure area, Prapiroon began to take a more westerly course beginning late on August 27.

[2] Despite consolidation of the previously distinct low-level circulation vortices, moderate wind shear displaced the newly merged center from much of its associated convection.

However, the storm's overall structure would improve over the following days as Prapiroon began to curve northward around the western periphery of the nearby high pressure region.

Roughly six hours later, the typhoon peaked in strength, with maximum sustained winds reaching 130 km/h (81 mph) and a barometric pressure bottoming out at 965 mbar (hPa; 28.50 inHg).

This intensity was held for at least the following 18 hours before Prapiroon's cloud structure began to elongate as the storm accelerated into more northerly latitudes,[1][2] where wind shear was increased.

[1] Prapiroon was downgraded back to severe tropical storm intensity shortly before it made landfall on the western coast of North Korea at 1300 UTC on August 31.

[2][3] Although Prapiroon crossed the Korean Peninsula at a rapid pace, upon emerging into the Sea of Japan early on September 1, its interaction of land had caused the majority of its convection to deteriorate.

[2] The Taiwanese Central Weather Bureau issued warnings for ships in the vicinity of Taiwan's northern and eastern shores on August 28 as Prapiroon approached the island.

[11][8] Storm surge associated with the typhoon coincided with the astronomical high tide along the coast of Mainland China, inundating large swaths of farmland and destroying thousands of homes.

Similar to its affects in the Ryukyu Islands, the storm mainly caused heavy rain, with rainfall totals peaking nationally in Nakagoya, Miyazaki Prefecture, where a station measured 253 mm (10.0 in) of precipitation.