Early on July 29, the depression showed signs of intensification and with that, JTWC upgraded it to Tropical Storm 11W.

Rapid deepening continued and it eventually became a category 5 super typhoon, with pressure dropping from 980 to 925 mbar in 48 hours.

On August 4, Halong weakened to a category 4 typhoon, due to it undergoing an eyewall replacement cycle.

On the same day, Halong weakened to a category 1 typhoon and started to affect mainland Japan.

[8] The JTWC downgraded Halong to a tropical storm on August 9, while the JMA followed suit several hours later.

On August 4, the NDRRMC warned residents of flood and landslide-prone areas in Luzon, to take precautions as Typhoon Halong would enhance the southwest monsoon.

[14] On August 7, 2 people were reported missing in Pangasinan, due to the enhanced monsoonal rains from Jose.

Early on August 9, Halong underwent a deep eyewall replacement cycle, just before landfall over mainland Japan.

[19] In the early-morning of August 10, Halong made landfall over Shikoku as a minimal typhoon, just before being downgraded as a severe tropical storm by the JMA.