October 2017 Vietnam tropical depression

The October 2017 Vietnam tropical depression, also known officially by its designation as Tropical Depression 23W, was a weak but deadly system that brought torrential rainfall and extreme flooding over northern and central Vietnam in October 2017. The depression formed on October 7, located to the northwest of Luzon, Philippines. The system moved in a general westward direction as it steadily intensified. 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.

Tropical Depression 23W
Tropical depression (JMA scale)
Tropical depression (SSHWS)
Tropical Depression 23W at peak intensity over Hainan Island on October 9
FormedOctober 7, 2017
DissipatedOctober 10, 2017
Highest winds10-minute sustained: 55 km/h (35 mph)
1-minute sustained: 55 km/h (35 mph)
Lowest pressure1000 hPa (mbar); 29.53 inHg
Fatalities109 total
Damage$602 million (2017 USD)
Areas affectedPhilippines, South China, Vietnam, Laos, Thailand
Part of the 2017 Pacific typhoon season

Meteorological history
Map plotting the track and the intensity of the storm, according to the Saffir–Simpson scale

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 had a broad low level circulation centre, while atmospheric convection associated with the system was displaced to the northeast of the centre.[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).[1] Over the next couple of days, the disturbance organised slightly, with atmospheric convection to the south of the disturbance improving as it moved westwards.[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).[6] Several hours later, the JTWC began issuing advisories and upgraded the system to a tropical depression, giving the designation of 23W.[7] The JMA followed suit and began issuing advisories three hours later on October 9.[8]

Preparations and impact

Vietnam
Damage by Province in Vietnam
Province Damage (VND) Damage
(2017 USD)		 Ref
Thanh Hoá 3.335 trillion $147 million [9]
Hoà Bình 2.473 trillion $109 million [10]
Hanoi 1.409 trillion $62 million [11]
Ninh Bình 1.052 trillion $46.3 million [12]
Sơn La 814 billion $35.8 million [13]
Nghe An 758 billion $33.4 million [14]
Yen Bai 700 billion $30.8 million [15]
Ha Nam 277 billion $12.2 million [16]
Thai Binh 130 billion $5.72 million [17]
Phu Tho 22.8 billion $1 million [18]
Other provinces 2.1 trillion $92.4 million [19]
Totals: 13 trillion $572 million [20][19]

Despite being a weak system, 23W caused severe damage in many provinces across northern Vietnam. Rainfall of 100–150 mm (3.9–5.9 in) was recorded in the northern and central parts of the country, especially in the provinces of Nghệ An and Hà Tĩnh. Many hydroelectric dams and lakes had to be discharged and the Ministry of Industry and Trade established a working group to ensure the safety of 31 hydroelectric lakes.[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. Rescuers saved 28 people from the "danger zone".[22] About 740 houses were flooded, with 30 ending up fully destroyed. The authorities mobilized some 2,200 people, including the military, police, Youth Union and civil defense offices, accompanied by a variety of means to search for missing victims, as well as support the people in the area. Moreover, the Red River was forecast to reach water levels of 3–50 cm (1.2–19.7 in).[22]

On October 12, a landslide occurred in a district in Hòa Bình Province, burying four households.[23] The number of flooded houses rose to 16,700. More than 39,300 hectares of crops were damaged along with two dikes. Around 1,200 cattle and roughly 40,000 fowl were either killed or swept away by flooding and landslides.[23] Rainfall in Mai Châu District, Hoà Bình Province, reached 390 mm (15.3 in), while Kim Bôi District, Hoà Bình Province, had a total of 450 mm (17.7 in). In Lương Sơn District, Hoà Bình Province, 13 hectares of rice were damaged along with 97 hectares of other agriculture crops and 7 hectares of fruit trees. 6 km of roads and 4 km of canal were also damaged due to the flooding.[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.[25]

Losses from damage in Yên Bái Province are estimated at 500 billion ₫ (US$22 million),[26] while Sơn La Province had 59 billion ₫ (US$2.6 million)[27] and Phú Thọ Province had 22.8 billion ₫ (US$1 million).[28] Lương Sơn district, Hoà Bình Province, suffered damage of about 25 billion ₫ (US$1.1 million),[24] and Lạc Sơn District, Hoà Bình Province, suffered damages of about 16 billion ₫ (US$704 thousand).[29] Hoa Binh province had total damages of 46 billion ₫ (US$2.02 million), including 9 billion ₫ (US$396 thousand) from Ky Son.[30] As of October 15, at least 68 people lost their lives; additionally, 30 were injured, and 34 are still missing.[31] Almost half of the dead (26 people) were in Hoà Bình Province.[32] In total, 100 people were killed and damages reached over 13 trillion ₫ (US$572 million).[19][33]

Thailand

Despite making landfall in Vietnam, 23W triggered severe flooding in Thailand and killed a total of 9 people.[33] As of October 19, damage from flooding estimated at US$30 million.[34]

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See also

References
  1. Significant Tropical Weather Advisory for the Western and South Pacific Oceans October 6, 2017 06z (Report). United States Joint Typhoon Warning Center. October 6, 2017.
  2. Significant Tropical Weather Advisory for the Western and South Pacific Oceans October 7, 2017 06z (Report). United States Joint Typhoon Warning Center. October 7, 2017.
  3. "Significant Tropical Weather Advisory for the Western and South Pacific Oceans October 7, 2017 06z". United States Joint Typhoon Warning Center. October 7, 2017. Archived from the original on October 8, 2017.
  4. "WWJP25 Warning and Summary October 7, 2017 00z". Japan Meteorological Agency. October 7, 2017. Archived from the original on November 10, 2013. Retrieved October 14, 2017.
  5. "WTPN21 PGTW 081000". Joint Typhoon Warning Center. October 8, 2017.
  6. "WWJP25 RJTD 081200". Japan Meteorological Agency. October 8, 2017.
  7. "Tropical Depression 23W (Twenty-three) Warning Nr 001". Joint Typhoon Warning Center. October 8, 2017.
  8. "TD". Japan Meteorological Agency. October 9, 2017.
  9. Hoàng Minh (November 1, 2017). "Thanh Hóa: Giúp đồng bào thiệt hại do lũ sớm ổn định cuộc sống" [Thanh Hoa: Helping people with damage caused by flood to stabilize their lives]. Dân Sinh (in Vietnamese). Ministry of Labour, Invalids and Social Affairs. Retrieved November 1, 2017.
  10. "Thiệt hại 2473 tỷ đồng do mưa lũ" [Damage of 2473 billion VND due to flood]. Hòa Bình (in Vietnamese). October 20, 2017. Retrieved October 20, 2017.
  11. Văn Nhuệ (November 7, 2017). "Mưa lũ khiến Hà Nội thiệt hại gần 1.409 tỷ đồng" [Rain floods caused Hanoi damage nearly 1.409 billion VND]. Hà Nội Mới (in Vietnamese). Retrieved November 7, 2017.
  12. Thái Bá (October 23, 2017). "Ninh Bình thiệt hại hơn 1.000 tỷ đồng trong trận lụt lịch sử" [Ninh Binh losses more than 1,000 billion VND in the flood of history]. Dân Trí (in Vietnamese). Vietnam Study Encouragement Association. Retrieved November 7, 2017.
  13. Nguyễn Nga (October 20, 2017). "Sơn La thiệt hại hơn 800 tỷ đồng do mưa lũ" [Son La lost over 800 billion VND due to flood]. Tài Nguyên Môi Trường (in Vietnamese). Ministry of Natural Resources and Environment. Retrieved November 7, 2017.
  14. N.Khoa (October 19, 2017). "5 ngày mưa lũ cuốn bay hơn 758 tỷ đồng ở Nghệ An" [5 days of torrential rain over 758 billion VND in Nghe An]. Nghệ An (in Vietnamese). Retrieved November 7, 2017.
  15. Thành Nam (October 17, 2017). "Yên Bái: Thiệt hại trên 700 tỷ đồng do mưa lũ" [Yen Bai: Damage over 700 billion VND due to flood]. Dân Sinh (in Vietnamese). Ministry of Labour, Invalids and Social Affairs. Retrieved November 1, 2017.
  16. Mạnh Hùng (October 17, 2017). "Ngành trồng trọt Hà Nam mất 277 tỷ đồng do mưa lũ" [Ha Nam's cultivation costs 277 billion VND due to floods]. Hà Nam (in Vietnamese). Retrieved November 1, 2017.
  17. Trần Tuấn (October 17, 2017). "Thái Thụy (Thái Bình) thiệt hại hơn 130 tỷ đồng sau mưa lũ" [Thai Thuy (Thai Binh) losses more than 130 billion after flood]. Tin Tức Việt Nam (in Vietnamese). Retrieved October 17, 2017.
  18. "Phú Thọ: Thiệt hại do mưa lũ ước tính trên 22,8 tỷ đồng" [Phu Tho: Damage caused by flood is estimated at 22.8 billion VND]. Phú Thọ (in Vietnamese). October 12, 2017. Retrieved October 12, 2017.
  19. https://www.gso.gov.vn/default.aspx?tabid=621&ItemID=18668
  20. http://dangcongsan.vn/kinh-te/mua-lu-gay-nhieu-thiet-hai-toi-san-xuat-nong-nghiep-trong-thang-10-460825.html
  21. "29 người thiệt mạng trong mưa lũ dồn dập" [29 dead in torrential rain and floods]. VNExpress (in Vietnamese). FPT Group. October 11, 2017. Retrieved October 11, 2017.
  22. Tùng Duy (October 11, 2017). "Lũ dữ tàn phá miền tây Yên Bái, thiệt hại hơn 100 tỷ đồng" [Rain and floods ravaged western Yên Bái, damage over 100 billion VND]. Tiền Phong (in Vietnamese). Ho Chi Minh Communist Youth Union. Retrieved October 11, 2017.
  23. "37 dead, 40 missing in landslides, floods in Vietnam". Hanoi: Xinhua News Agency. October 12, 2017. Retrieved October 12, 2017.
  24. Trần Trang (October 13, 2017). "Lương Sơn: Tổng thiệt hại do mưa lũ gây ra khoảng 25 tỷ đồng" [Lương Son: Total damage caused by the flood is about 25 billion VND]. Hòa Bình (in Vietnamese). Retrieved October 13, 2017.
  25. "Trung ương Hội CTĐ Việt Nam hỗ trợ 250 triệu đồng cho các gia đình nạn nhân vụ sạt lở ở Phú Cường" [Central Vietnam Red Cross supports families of victims of landslide in Phú Cường with 250 million VND]. Hòa Bình (in Vietnamese). October 12, 2017. Retrieved October 12, 2017.
  26. Đinh Tuấn (October 14, 2017). ""Tập trung thực hiện mọi biện pháp ổn định đời sống đồng bào vùng lũ"" [Focus on implementing all measures to stabilize the life of people in flooded areas] (in Vietnamese). Tây Bắc: Voice of Vietnam. Retrieved October 14, 2017.
  27. Thanh Thủy (October 12, 2017). "Sơn La thiệt hại hơn 59 tỷ đồng vì mưa lũ" [Sơn La lost over 59 billion VND due to floods] (in Vietnamese). Tây Bắc: Voice of Vietnam. Retrieved October 12, 2017.
  28. "Phú Thọ: Thiệt hại do mưa lũ ước tính trên 22,8 tỷ đồng" [Phú Thọ: Damage caused by flood in is estimated at 22.8 billion VND]. Phú Thọ (in Vietnamese). October 12, 2017. Retrieved October 12, 2017.
  29. Đinh Thắng (October 12, 2017). "Lạc Sơn Thiệt hại do mưa lũ ước khoảng 16 tỷ đồng" [Damage in Lạc Sơn due to floods is estimated at 16 billion VND]. Hòa Bình (in Vietnamese). Retrieved October 12, 2017.
  30. Đinh Thắng (October 13, 2017). "Kỳ Sơn thiệt hại do mưa lũ ước gần 9 tỷ đồng" [Ky Son damages due to rain estimated nearly 9 billion VND]. Hòa Bình (in Vietnamese). Retrieved October 13, 2017.
  31. Tuấn Phùng; Chung Thủy (October 14, 2017). "68 người chết trong mưa lũ, 34 người còn mất tích" [68 people died in the flood, 34 people missing]. Tuổi Trẻ (in Vietnamese). Ho Chi Minh Communist Youth Union. Retrieved October 15, 2017.
  32. "Hơn 50 người thiệt mạng do mưa lũ" [More than 50 people died of floods]. VNExpress (in Vietnamese). FPT Group. October 12, 2017. Retrieved October 12, 2017.
  33. "Global Catastrophe Recap October 2017" (PDF). thoughtleadership.aonbenfield.com. Aon Benfield. Retrieved November 9, 2017.
  34. http://thoughtleadership.aonbenfield.com/Documents/20180124-ab-if-annual-companion-volume.pdf
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