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Tropical Storm Sonca (2017)

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Tropical Storm Sonca
Sonca nearing landfall on July 25
Meteorological history
FormedJuly 21, 2017
DissipatedJuly 29, 2017
Tropical storm
10-minute sustained (JMA)
Highest winds65 km/h (40 mph)
Lowest pressure994 hPa (mbar); 29.35 inHg
Tropical storm
1-minute sustained (SSHWS/JTWC)
Highest winds85 km/h (50 mph)
Lowest pressure989 hPa (mbar); 29.21 inHg
Overall effects
Fatalities37 total
Damage$313 million (2017 USD)
Areas affectedHainan, Vietnam, Cambodia, Laos, Thailand (particularly Northeast Thailand), Myanmar
IBTrACSEdit this at Wikidata
Part of the 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.[a] 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

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Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
Map key
Saffir–Simpson scale
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
triangle Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

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.[5]

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

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Vietnam

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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]

Warning for Tropical Storm Sonca issued for Vietnam.

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 5,777 hectares (14,280 acres) of paddy fields and 750 hectares (1,900 acres) 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

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Warning issued by the Joint Typhoon Warning Center for Tropical Storm Sonca.

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

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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

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Notes

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  1. ^ 2017 USD.

References

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  1. ^ "Marine Weather Warning for GMDSS Metarea XI 2017-07-21T06:00:00Z". WIS Portal – GISC Tokyo. Japan Meteorological Agency. Archived from the original on July 29, 2017. Retrieved July 21, 2017.
  2. ^ "Tropical Depression 08W (Eight) Warning Nr 001". Joint Typhoon Warning Center. July 21, 2017. Archived from the original on May 23, 2024.
  3. ^ "Prognostic Reasoning for Tropical Depression 08W (Eight) Warning NR 01". Joint Typhoon Warning Center. July 21, 2017. Retrieved September 12, 2024.
  4. ^ "Prognostic Reasoning for Tropical Depression 08W (Eight) Warning NR 05". Joint Typhoon Warning Center. July 22, 2024. Retrieved September 12, 2024.
  5. ^ a b "Prognostic Reasoning for Tropical Storm 08W (Sonca) Warning No 10". Joint Typhoon Warning Center. July 23, 2017. Retrieved October 13, 2024.
  6. ^ "Tropical Storm 08W (Eight) Warning Nr 009". Joint Typhoon Warning Center. July 23, 2017. Archived from the original on May 23, 2024.
  7. ^ "Prognostic Reasoning for Tropical Storm 08W (Sonca) Warning NR 13". Joint Typhoon Warning Center. July 14, 2017. Retrieved September 14, 2024.
  8. ^ "Tropical Storm 08W (Sonca) Warning Nr 016". Joint Typhoon Warning Center. July 24, 2017. Archived from the original on May 23, 2024.
  9. ^ "Tropical Storm 08W (Sonca) Warning Nr 018". Joint Typhoon Warning Center. July 25, 2017. Archived from the original on May 23, 2024.
  10. ^ "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]. Thể thao & Văn hóa (in Vietnamese). Vietnam News Agency. July 25, 2017. Archived from the original on July 25, 2017. Retrieved August 5, 2017.
  11. ^ "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]. Báo Ảnh Việt Nam (in Vietnamese). Vietnam News Agency. August 3, 2017. Retrieved September 14, 2024. [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. ^ Xuân Tùng (July 24, 2017). "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]. Báo Tin tức (in Vietnamese). Vietnam News Agency. Retrieved September 14, 2024. [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. ^ "Viet Nam, the Impact of Tropical Storm "Sonca"". ReliefWeb. United Nations Office for the Coordination of Humanitarian Affairs. July 31, 2017. Archived from the original on August 15, 2017. Retrieved September 21, 2024.
  14. ^ Thanh Huyền (July 28, 2017). "Nghệ An: Bão số 4 gây thiệt hại trên 127 tỷ đồng" [Nghe An: Typhoon No. 4 caused over 127 billion dong in damage]. Đài Phát thanh – Truyền hình Nghệ An (in Vietnamese). Archived from the original on April 2, 2019. Retrieved September 21, 2024.
  15. ^ "Tổng hợp thiệt hại do thiên tai năm 2017" [Total damages from natural disasters in 2017] (PDF) (in Vietnamese). Vietnamese Ministry of Agriculture and Rural Development. Archived from the original (PDF) on March 31, 2020. Retrieved March 21, 2024.
  16. ^ a b "AHA Centre Flash Update: Flooding, Cambodia, Lao PDR, Myanmar & Thailand". ReliefWeb. United Nations Office for the Coordination of Humanitarian Affairs. August 2, 2017. Archived from the original on August 2, 2017. Retrieved August 5, 2017.
  17. ^ "Cambodia, The Impact of Tropical Storm "Sonca"". ReliefWeb. United Nations Office for the Coordination of Humanitarian Affairs. July 28, 2017. Archived from the original on September 21, 2024. Retrieved September 14, 2024.
  18. ^ Kunthear, Mom (July 25, 2017). "Tropical storm promises downpour". Khmer Times. Retrieved September 14, 2024.
  19. ^ "Sakon Nakhon flood damage estimated at over Bt100 million". The Nation. Archived from the original on September 3, 2017. Retrieved August 5, 2017.
  20. ^ "King urges quick relief after floods". Bangkok Post. July 31, 2017. Archived from the original on August 3, 2017. Retrieved September 21, 2024.
  21. ^ "Flooding worsens as Sonca influence intensifies". Pattaya Mail. July 29, 2017. Archived from the original on August 13, 2017. Retrieved August 14, 2017.
  22. ^ "Thailand floods kill 23, cause damage estimated at $300 million". Reuters. August 3, 2017. Archived from the original on September 25, 2017. Retrieved September 21, 2024.
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