Seasonal monsoon associated with low-pressure area (6–9 October) On 7 October, a
low-pressure area made landfall in the provinces of the
South Central Coast. Enhanced by the seasonal
northeast monsoon, many provinces nearby experienced heavy rainfall with average accumulations ranging from 200 to 300 mm. In
Sa Huỳnh (Quảng Ngãi), rainfall peaked at . By 11 October, prior to the landfall of Tropical Storm Linfa, heavy floods had already killed nine people.
Tropical Storm Linfa after flooding on 10 October 2020. On 9 October, a tropical depression formed in the east of
Luzon. It was upgraded to a tropical storm and was named
Linfa by the
Japan Meteorological Agency (JMA) the next day. On 11 October, Linfa made landfall along Vietnam's Central Coast in Quảng Ngãi province— an area already flooded by monsoonal flooding from 6 to 9 October. It delivered historic levels of rainfall to
Central Vietnam, with accumulations peaking at in
A Lưới (
Thừa Thiên Huế) and in Hướng Linh (
Quảng Trị), In total, Linfa left 174 people dead and 20 people missing in Vietnam and Cambodia.
Rào Trăng 3 landslides On the night of 11 October, heavy rainfall associated with Tropical Storm Linfa triggered a landslide at the Rào Trăng 3 Hydropower Plant in Phong Điền District,
Thừa Thiên Huế Province, leaving 17 construction workers missing. On 12 October, a military rescue team was dispatched to search for the missing workers was struck by a second landslide, killing Major General
Nguyễn Văn Man and 12 other soldiers.
Tropical Storm Nangka on 13 October A tropical depression formed west of Luzon on 11 October, and was upgraded to a tropical storm and named
Nangka the following day. On 13 October, Nangka crossed the Gulf of Tonkin, and it made landfall in
Ninh Bình on 14 October. In preparation for Tropical Storm Nangka, more than 150,000 people in
Vietnam were evacuated from their homes.
Vietnam Airlines and
Pacific Airlines announced announced the cancellation of eight flights to the two airports. Still, wind gusts reached up to in
Nam Định. Heavy rainfall was recorded in several northern provinces, including in
Yên Bái and in
Quảng Ninh on 16 October. The storm caused two deaths and left one person missing in Northern Vietnam.
Tropical Depression Ofel After entering the South China Sea, Ofel made landfall and subsequently dissipated over Central Vietnam on 16 October. Ten deaths had been reported by 21 October, likely attributed to the remnants of Ofel combined with the effects the northeast monsoon. Rainfall had significantly decreased as of 20 October.
Hướng Hóa landslides On 18 October, a sudden landslide buried the
barracks of an army economic division in Hướng Phùng Commune, Hướng Hoá District of
Quảng Trị Province, resulting in the deaths of 22 soldiers. Another landslide in the district also killed six members of a family and one rescue worker.
Tropical Storm Saudel As Typhoon Saudel approached
Vietnam, it began to rapidly weaken due to high vertical
wind shear and was downgraded to a tropical storm on 24 October. It was further downgraded to a remnant low on the next day, as its center became largely devoid of deep convection. Despite its weakening, Saudel still brought heavy rainfall to Central Vietnam. The storm also generated strong winds and rough seas in the waters off the Malaysian state of
Sabah, where the
Malaysian Meteorological Department (MetMalaysia) issued a tropical storm advisory, noting that the storm was located northwest of
Kudat, the nearest town.
Typhoon Molave Nearly 1.3 million people were evacuated in Vietnam as
Prime Minister Nguyễn Xuân Phúc ordered boats onshore and called for preparations by local security forces and residents in the area. The Prime Minister also compared Molave to
Typhoon Damrey in 2017. Hundreds of flights were canceled, and schools across affected areas were forced to close. The federal
government mobilized approximately 250,000 troops and 2,300 vehicles to support search and rescue missions. Members of the
Vietnamese military assisted in evacuating elderly people onto buses, securing vessels, and placing sandbags on rooftops. On 27 October, the Da Nang
People's Committee instructed people to remain indoors starting at 20:00 local time and advised all government officials and workers to stay home the following day as part of emergency preparedness measures. The same day, two Vietnamese fishing vessels sank due to the approaching typhoon. Search efforts were launched to locate the 26 missing fishermen aboard the boats. Coastal areas experienced wave heights reaching . The typhoon caused widespread destruction across Central Vietnam. Wind gusts peaked at in the city of
Quảng Ngãi. It caused 13 deaths, injured 16 people, and left 48 others missing. As of 1 November, Vietnam estimated total economic losses from Molave at approximately 10 trillion
VND (US$430 million).
Quảng Nam landslides Devastating landslides caused by Molave have killed at least 28 people in the communes of
Nam Trà My District,
Quảng Nam Province. Another landslide in Phước Sơn District buried 11 members of a family. On 4 November, Quảng Ngãi People's Committee Chairman Đặng Văn Minh ordered evacuations in landslide-prone areas. Meanwhile, the National Committee for Natural Disaster Prevention and Control and Search and Rescue mobilized more than 64,500 personnel and 1,718 vehicles to support emergency response efforts. On 5 November, Tropical Depression Goni made landfall in southern
Bình Định Province, marking the fifth
tropical cyclone to strike the country within 30 days. On 6 November, a man in
Quảng Ngãi Province was swept away by floodwaters, while another went missing after his ship sank. Twenty houses in
Quảng Nam Province collapsed into a river and a school was damaged. In Bình Định Province, two houses were destroyed by landslides and of croplands were damaged. Roads in several provinces were damaged by erosion and landslides, including parts of the
Ho Chi Minh Highway. Damages in
Bình Định from both Goni and the later Tropical Storm Etau were calculated to be
₫543 billion (US$23.5 million).
Tropical Storm Etau On 7 November, the JMA began tracking a tropical depression east-southeast of
Manila. At 12:00
UTC on the same day, the
PAGASA declared the system as a tropical depression and named it
Tonyo as it formed over
Burias Island. It further strengthened into a tropical storm on 9 November and received the international name
Etau. Etau then continued its path toward Central Vietnam after crossing the
Philippines. The storm made landfall on 10 November, resulting in two deaths: one in
Quảng Nam and one in
Bình Định, and damaging 31 houses. It brought over of rainfall to the provinces of
Bình Định,
Khánh Hòa, and
Phú Yên. Strong winds associated with Etau uprooted trees and tore the roofs off buildings, many of which were still recovering from the prior impacts of
Typhoon Molave and the weakened
Tropical Storm Goni. Localized power outages were also reported in the city of
Tuy Hòa. Economic losses in
Tuy An District,
Phú Yên were estimated at 122 billion
VND (US$5.26 million).
Typhoon Vamco After crossing and wreaking havoc in the Philippines as
Typhoon Ulysses with an initial peak of a Category 3-equivalent typhoon, the storm gradually weakened below typhoon status before it exited the
Philippine Area of Responsibility (PAR) at 01:30 UTC on 12 November. After exiting the PAR, Vamco continued its path towards Vietnam. On 14 November, the Vietnamese Government ordered the evacuation of at least 460,000 people in anticipation of the typhoon's landfall. That morning, all flights at five airports:
Da Nang,
Chu Lai,
Phú Bài,
Đồng Hới and
Vinh were either suspended or delayed due to the approaching storm. Vamco began affecting Central Vietnam around midnight
ICT on 15 November. Despite having weakened, a weather station on
Lý Sơn island reported sustained winds of and gusts reaching . Strong winds uprooted trees and damaged numerous homes across four provinces from
Hà Tĩnh to
Thừa Thiên Huế. In
Da Nang, storm surge destroyed sections of sea embankments and scattered rocks and debris across roads and residential areas. One person was killed in
Thừa Thiên Huế, with over 1,500 houses collapsed and economic losses in
Quảng Bình reached 450 billion
VND (US$19.4 million). As of 16 November, Vietnamese authorities reported the evacuation 325,000 individuals and five injuries due to Vamco. ==Floodings by province==