Shortly after its peak, Holly accelerated northeast due to the westerlies in the general direction of the Korean Peninsula.

Land interaction with South Korea triggered a weakening trend, and after entering the Sea of Japan, Holly began to transition into an extratropical cyclone.

In advance of the typhoon, ferry service between Jeju and mainland South Korea was called off, prompting 800 fishing boats to seek shelter.

Water levels around Khabarovsk rose 10 m (33 ft) along the Amur River, resulting in the evacuation of 64 families, although 2,000 cows and pigs remain stranded.

Elsewhere, in Arkhara, a dam along the Amur River burst, which caused the worst flooding in the region since 1928 and resulted in the evacuation of many isolated children by helicopter.

While Tropical Storm Gerald was forming in the South China Sea, the Western Pacific monsoon trough extended eastward in the middle of August 1984.

The Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert (TCFA) at 15:15 UTC on August 14.

At 00:00 UTC on the next day, a Hurricane Hunter aircraft investigated the system, measuring a pressure of 998 mbar (29.5 inHg).

[5][nb 2] Despite its large size, Holly slowly deepened,[2] and was upgraded to a typhoon by the JMA at noon on August 17.

Land interaction with South Korea resulted in a weakening trend, with both the JTWC and JMA downgrading Holly to a tropical storm.

Ferry service between Cheju and the mainland was canceled due to the impeding threat of rough seas,[8] prompting 800 fishing boats to seek shelter.

[9] Nation-wide, one person was killed due to high waves in Nagasaki,[16] nine were listed as missing,[2] and eleven were wounded, including nine in Okinawa and the western prefectures of Kumamoto, Nagaski, Yamaguchi, and Hiroshima while two in Aichi Province sustained injuries after strong winds toppled a tree.