Tropical Storm Sonca (2017) Explained

Tropical Storm Sonca
Formed:July 21, 2017
Dissipated:July 29, 2017
Winds:35
Pressure:994
Winds:45
Pressure:989
Year:2017
Fatalities:37 total
Damage:313000000
Areas:Hainan, Vietnam, Cambodia, Laos, Thailand (particularly Northeast Thailand), Myanmar
Season:2017 Pacific typhoon season

Tropical Storm Sonca was a weak tropical cyclone that impacted Southeast Asia during the end of July 2017. As the 10th named storm of the 2017 Pacific typhoon season, Tropical Storm Sonca formed south of Hong Kong, after drifting westward for multiple days, the storm intensified into a tropical storm, receiving the name Sonca. The storm later affected Hainan, reaching its peak intensity. On July 25, the storm made landfall over the Quảng Trị province, then dissipated.

The storm killed 37 people, with a damage of $313 million USD. In Vietnam, 1,500 houses were damaged, with an impact of $13 million USD. The storm also affected Cambodia, killing three people and destroying 2686 houses. Thailand was the most affected, with 23 fatalities.

Meteorological history

On July 21, both the JMA and the JTWC reported that Tropical Depression 08W had developed approximately 582 km (361 mi) to the south of Hong Kong.[1] [2] The storm had a rapidly consolidating low-level circulation center. The storm had a favorable environment, with slight improvement of poleward outflow. The JTWC later assessed the certainty to intensity to a tropical cyclone as poor, assessing multiple problems, such as poor initialization and small size.[3] The next day, the storm had a favorable environment still, with vertical windshear offset by poleward outflow. The JTWC still kept their certainty as poor.[4] On the early hours of the next day, the JTWC upgraded their certainty to good based on newly uncovered satellite footage, the JTWC also designated the system as a tropical storm.[5] After drifting westward for a couple of days, the system strengthened into a tropical storm by JMA while nearing the island province of Hainan,[6] receiving the name Sonca.

13 hours later, the storm was pulled southward by a building direction. Just before the storm had its peak intensity, the storm rapidly intensified after reports of a consolidating low-level circulation center. The storm later accelerated north after a steering ridge reoriented the storm.[7] By July 24, Sonca reached its maximum intensity with a minimum pressure of 994 hPa.[8] Early on July 25, the JTWC issued its final advisory as the system made landfall over in the Quảng Trị Province, Vietnam.[9] [10]

Preparations and impact

Vietnam

During the storm, heavy floods were recorded in Vietnam, causing catastrophic property damage, submerging 229 villages.[11] A Telegram was sent to send firefighters and police to rescue people in the northern provinces of Vietnam.[12] At least six people were killed when the storm made landfall on July 25, all in the provinces of Hà Tĩnh and Quảng Trị. Also, about 1,500 houses were damaged in these two provinces. Across the whole of Vietnam, roughly of paddy fields and of croplands were damaged.[13] In Nghe An Province, the total damage caused by the storm reached 127 billion dong (US$5.6 million).[14] Total damage in Vietnam reached 300.7 billion dong (US$13 million).[15]

Cambodia

Tropical Storm Sonca affected four provinces across Cambodia, at least three people died, and 2686 houses were submerged. 53 households were also affected.[16] In the Choam Khsant District, 48 families had to be evacuated because of the storm. Heavy floods affected four provinces, with 550 affected families and at least 1000 displaced residents.[17] The National Committee for Disaster Management for Cambodia warned fishermen about the rough weather from the storm.[18]

Thailand

Flash floods across Thailand killed 23 people and affected 44 out of 76 provinces in Thailand. The hardest hit province was Sakon Nakhon, Northeast Thailand as the storm forced the closer of Sakon Nakhon Airport lasting for 3 days.[16] Damages in Sakon Nakhon exceeded 100 million baht (US$3 million).[19] The floods created by the storm were the strongest floods in Thailand for two decades.[20]

Heavy rain damaged bridges in Khon Kaen province and flooded buildings in Ubon Ratchathani province and Sisaket province, where some people were relocated to temporary accommodations. In Lopburi province, some people were rescued by boat after the roads became impassable. In Sukhothai province, the Yom River flooded, and sandbags were used to help contain the floodwaters. Trains had to be re-routed in Nong Khai province when telephone poles fell on the tracks.[21]

In total, the damage from flooding triggered by the storm in Thailand reached 10 billion baht (US$300 million).[22]

See also

External links

Notes and References

  1. Web site: Marine Weather Warning for GMDSS Metarea XI 2017-07-21T06:00:00Z . dead . https://web.archive.org/web/20170729052657/https://www.wis-jma.go.jp/cms/warning/2017/07/21/marine-weather-warning-for-gmdss-metarea-xi-2017-07-21t060000z/ . 29 July 2017 . July 21, 2017 . WIS Portal – GISC Tokyo . Japan Meteorological Agency.
  2. Web site: Tropical Depression 08W (Eight) Warning Nr 001. https://archive.today/20240523012907/https://www.webcitation.org/6s83efddv?url=http://gwydir.demon.co.uk/advisories/WTPN52-PGTW_201707210300.htm. dead. May 23, 2024. July 21, 2017. Joint Typhoon Warning Center.
  3. Web site: 21 July 2017 . Prognostic Reasoning for Tropical Depression 08W (Eight) Warning NR 01 . 12 September 2024 . Joint Typhoon Warning Center.
  4. Web site: 22 July 2024 . Prognostic Reasoning for Tropical Depression 08W (Eight) Warning NR 05 . 12 September 2024 . Joint Typhoon Warning Center.
  5. Web site: 23 July 2017 . Prognostic Reasoning for Tropical Storm 08W (Sonca) Warning No 10 . 13 October 2024 . Joint Typhoon Warning Center.
  6. Web site: Tropical Storm 08W (Eight) Warning Nr 009. https://archive.today/20240523012948/https://www.webcitation.org/6sBAYURHR?url=http://gwydir.demon.co.uk/advisories/WTPN52-PGTW_201707230300.htm. dead. May 23, 2024. July 23, 2017. Joint Typhoon Warning Center.
  7. Web site: 14 July 2017 . Prognostic Reasoning for Tropical Storm 08W (Sonca) Warning NR 13 . 14 September 2024 . Joint Typhoon Warning Center.
  8. Web site: Tropical Storm 08W (Sonca) Warning Nr 016. https://archive.today/20240523013109/https://www.webcitation.org/6sE9jfwUq?url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201707242100.htm. dead. July 24, 2017. May 23, 2024. Joint Typhoon Warning Center.
  9. Web site: Tropical Storm 08W (Sonca) Warning Nr 018. https://archive.today/20240523013027/https://www.webcitation.org/6sE9iuwI3?url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201707250900.htm. dead. May 23, 2024. July 25, 2017. Joint Typhoon Warning Center.
  10. Web site: VIDEO Cập nhật bão số 4: Đổ bộ vào Quảng Trị và gây mưa lớn. VIDEO Update about Typhoon No. 4: Makes landfall in Quảng Trị and causes heavy rain. vi. Thể thao & Văn hóa. Vietnam News Agency. July 25, 2017. https://web.archive.org/web/20170725173102/http://thethaovanhoa.vn/xa-hoi/video-cap-nhat-bao-so-4-do-bo-vao-quang-tri-va-gay-mua-lon-n20170725200442334.htm. July 25, 2017. live. August 5, 2017.
  11. Web site: 2017-08-03 . Thủ tướng gửi điện thăm hỏi tình hình lũ lụt tại Đông Bắc Thái Lan . The Prime Minister sent a telegram to visit the flood situation in Northeast Thailand . 2024-09-14 . Báo Ảnh Việt Nam . . vi-vn . It is reported that Typhoon Sonca has caused floods that caused great property damage in the northeastern provinces of Thailand, In Nakhon Ratchasima province, at least 229 villages in 5 districts have been submerged.
  12. Web site: Xuân Tùng . 2017-07-24 . Bộ Công an chỉ đạo lực lượng ứng phó với cơn bão số 4 . The Ministry of Public Security directs the force to respond to storm No. 4 . 2024-09-14 . Báo Tin tức . . vi . On July 24, the Ministry of Public Security issued a telegram requesting the Police, Fire Prevention and Fighting Police of coastal provinces and cities from Quang Ninh to Da Nang and the Northern and North Central provinces to proactively deal with Typhoon No. 4.
  13. Web site: Viet Nam, the Impact of Tropical Storm "Sonca" . ReliefWeb . . https://web.archive.org/web/20170815175403/http://reliefweb.int/report/viet-nam/viet-nam-impact-tropical-storm-sonca . August 15, 2017 . live . July 31, 2017 . September 21, 2024.
  14. Web site: Thanh Huyền. Nghệ An: Bão số 4 gây thiệt hại trên 127 tỷ đồng. Nghe An: Typhoon No. 4 caused over 127 billion dong in damage . vi . Đài Phát thanh – Truyền hình Nghệ An . 2017-07-28 . https://web.archive.org/web/20190402114325/https://truyenhinhnghean.vn/kinh-te/201707/nghe-an-bao-so-4-gay-thiet-hai-tren-127-ty-dong-707889/ . 2019-04-02 . live . 2024-09-21 .
  15. Web site: Tổng hợp thiệt hại do thiên tai năm 2017 . https://web.archive.org/web/20200331132808/http://phongchongthientai.mard.gov.vn/FileUpload/2019-08/u4fxaVGl-kKJ8YgF2017-00.%20THIET%20HAI%20NAM%202017_tinh,%20tp_ngay%2031.12.2017.pdf . 2020-03-31 . Total damages from natural disasters in 2017 . vi . . 2024-03-21 .
  16. Web site: AHA Centre Flash Update: Flooding, Cambodia, Lao PDR, Myanmar & Thailand . ReliefWeb . . https://web.archive.org/web/20170802144724/https://reliefweb.int/report/myanmar/aha-centre-flash-update-flooding-cambodia-lao-pdr-myanmar-thailand . August 2, 2017 . dead . August 2, 2017 . August 5, 2017.
  17. Web site: 2017-07-28 . Cambodia, The Impact of Tropical Storm "Sonca" . https://web.archive.org/web/20240921033246/https://reliefweb.int/report/cambodia/cambodia-impact-tropical-storm-sonca . 2024-09-21 . 2024-09-14 . ReliefWeb . . en.
  18. Web site: Kunthear . Mom . July 25, 2017 . Tropical storm promises downpour . September 14, 2024 . Khmer Times.
  19. Web site: Sakon Nakhon flood damage estimated at over Bt100 million. The Nation. August 5, 2017. September 3, 2017. https://web.archive.org/web/20170903004851/http://www.nationmultimedia.com/detail/breakingnews/30322185. dead.
  20. News: King urges quick relief after floods. July 31, 2017. https://web.archive.org/web/20170803233648/http://www.bangkokpost.com/news/general/1296843/king-urges-quick-relief-after-floods. August 3, 2017. live. Bangkok Post. September 21, 2024.
  21. Web site: Flooding worsens as Sonca influence intensifies . 2017-07-29 . Pattaya Mail . 2017-08-14 . 2017-08-13 . https://web.archive.org/web/20170813105123/http://www.pattayamail.com/thailandnews/flooding-worsens-sonca-influence-intensifies-182050 . dead .
  22. News: Thailand floods kill 23, cause damage estimated at $300 million. https://web.archive.org/web/20170925181652/https://www.reuters.com/article/us-thailand-floods/thailand-floods-kill-23-cause-damage-estimated-at-300-million-idUSKBN1AJ1KT. September 25, 2017. live. Reuters. August 3, 2017. September 21, 2024.

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