Despite being forecast to strengthen into a tropical storm, 23W failed to reach this intensity, due to lack of organization as it made landfall in Hà Tĩnh Province on October 10.

During October 6, the United States Joint Typhoon Warning Center (JTWC) started to monitor a tropical disturbance, that had developed about 1,010 km (630 mi) to the east of Manila in the Philippines.

[1] The system was also located within a favourable environment for further slow development, with low to moderate vertical windshear and very warm sea surface temperatures of 30–32 °C (86–90 °F).

[2][3] During October 7, the Japan Meteorological Agency (JMA) reported that the disturbance had developed into a tropical depression, before the system passed over the Philippine island of Luzon.

[1][4] By 10:00 UTC of October 8, the JTWC had issued a Tropical Cyclone Formation Alert,[5] while the JMA had determined that the system had winds of 55 km/h (35 mph).

[21] Heavy rainfall contributed to flash flooding, with five people swept away and an additional five injured in the district of Trạm Tấu, Yên Bái Province.

[24] The Vietnam Red Cross offered about 250 million ₫ (US$11 thousand) to families affected by a landslide in Phú Cường, Tân Lạc District, Hòa Bình Province.