Meteorological history | |
---|---|
Formed | July 14,2017 |
Dissipated | July 17,2017 |
Severe tropical storm | |
10-minute sustained (JMA) | |
Highest winds | 95 km/h (60 mph) |
Lowest pressure | 985 hPa (mbar);29.09 inHg |
Tropical storm | |
1-minute sustained (SSHWS/JTWC) | |
Highest winds | 95 km/h (60 mph) |
Lowest pressure | 985 hPa (mbar);29.09 inHg |
Overall effects | |
Fatalities | 14 total |
Damage | $118 million (2017 USD) |
Areas affected | Vietnam,South China,Laos,Thailand,Myanmar |
IBTrACS | |
Part of the 2017 Pacific typhoon season |
Severe Tropical Storm Talas was a tropical cyclone that affected Vietnam in mid-July 2017. The storm was first identified as a tropical disturbance over the South China Sea on July 13 and was upgraded to a tropical depression the following day. On July 15,the depression intensified into a named storm of the 2017 Pacific typhoon season. Before making landfall in Vietnam,Talas reached its peak intensity as a severe tropical storm on July 16. It weakened to an area of low pressure on July 17 as it moved inland. Throughout Vietnam,the storm resulted in 14 fatalities and damaged approximately 2,700 homes. Rough seas caused about 50 boats to sink. Nearly 50,000 hectares (120,000 acres) of vegetable fields,around 800 ha (2,000 acres) of aquaculture,and 47,600 ha (118,000 acres) of rice and other subsidiary crops were affected. The storm caused an estimated US$8.8 million in damages in Hainan province,China,increased rainfall in Myanmar and Thailand,and triggered landslides and flooding in parts of Central and Northern Laos.
The origins of Talas began from an area of convection, positioned between two north-south oriented ridges. On July 13, the Joint Typhoon Warning Center (JTWC) began monitoring a tropical disturbance located approximately 648 km (403 mi) to the southeast of Hanoi, Vietnam. [1] By the next day, at around 06:00 UTC, the Japan Meteorological Agency (JMA) classified the system as a weak tropical depression, as it started to move slowly towards the northwest at a speed of 19 kilometres per hour (12 mph). [2] Six hours later, the JMA began issuing advisories, stating that the system was producing 10-minute sustained winds of at least 55 km/h (34 mph). [3] The JTWC issued a Tropical Cyclone Formation Alert at 02:30 UTC on July 15, after satellite imagery depicted deep convection wrapping into its developing low-level circulation center, with a favorable environment for further development within Hainan. [4] With the system continuing to develop, the JMA upgraded it to a tropical storm, assigning it the name Talas. [5]
As convective banding improved, the JTWC downgraded the disturbance to a tropical depression by midday on July 15. [6] [7] Several hours later, the JTWC further upgraded it to a tropical storm after recording Dvorak estimates of T2.5, indicating 1-minute sustained winds of 65 km/h (40 mph). [8]
On July 16, Talas gradually intensified as it became better organized in response to being located in a favorable environment, consisting of low to moderate northeasterly vertical wind shear as well as good outflow to the south. [9] At 09:00 UTC, the JMA upgraded it into a severe tropical storm after the storm attained 10-minute sustained winds of 95 km/h (59 mph), and a minimum barometric pressure of 985 hPa (29.1 inHg); constituting its peak intensity. [10] At the same time, the JTWC recorded one-minute sustained peak winds of 95 km/h (59 mph) while trailing along Hainan. [11]
Shortly thereafter, Talas began to weaken due to land interaction and the JMA soon downgraded the system back to a tropical storm. [12] Around 18:00 UTC, the storm made landfall in Central Vietnam, near the city of Vinh. [13] Three hours later, the JTWC issued their final advisory on Talas as it continued to degrade while progressing inland. [14] The JMA soon followed suit with their final advisory at 09:00 UTC on July 17, while the weakening storm was located over the northern portion of Laos. [15]
On July 15, Meteorologists expected heavy rainfall from the storm. [16] Talas made landfall near Vinh at around 18:00 UTC on July 16 as a moderate tropical storm. [13] According to the Central Steering Committee for Natural Disaster Prevention and Rescue, more than 2,700 homes were damaged in Nghe An Province. The Vietnam's National Center for Hydro-Meteorological Forecasting recorded wind gusts up to 100 km/h (62 mph) with wind damage being reported in Nghe An, Thanh Hóa and Ha Tinh provinces. [13] Over 400 mm (16 in) of rain fell in the central and northern parts of the country in the two days following up to landfall, while the capital, Hanoi, received 100 mm (3.9 in). [17] The storm sank a coal ship late on July 16; only three of the people on board were rescued while another ten remained missing. The most affected province [lower-alpha 1] was Nghe An, with one fatality. [18] In the Quảng Bình Province, fishing boats were washed ashore by waves as high as 5 m (16 ft); there, seven people were injured. A boat carrying eight weather officials were rescued by the national guard after the storm. On July 17, flooded streets and disrupted train services stranded more than 4,000 passengers in the capital. Railway services from Hanoi to Vinh were canceled while trains from Hanoi to Saigon were delayed by five to seven hours. [19]
The storm hit the provinces of Thanh Hóa and Hà Tĩnh. [20] The Irrigation Department General Thongplew Kongjun stated that the department had multiple plans and measures to tame the impact caused by the storm. Including ordering every district to have an irrigation office and/or adding pumps. [21] The storm caused multiple severe traffic jams, and capsized a ship, injuring seven people. [22] Power lines in three provinces were damaged as a result of the storm. [23] Eight flights were cancelled by the airline VietJet Air. [24] Multiple other airlines cancelled ten other flights. [25]
Overall, in Vietnam, the storm left 14 people dead and damaged around 2,700 houses. [26] About 50 boats sank. Around 50,000 ha (123,555 acres) of vegetable fields, [17] about 801 ha (1,980 acres) of aquaculture farms, and 47,632 ha (117,700 acres) of rice and subsidiary crops were damaged. [27] Damages in Nghe An were reported to reach up to 993 billion₫ (US$43.7 million). [28] Total damage in Vietnam reached 1.6 trillion₫ (US$70.4 million). [29] The total cost of other damages was estimated at 2.52 trillion₫ (US$109 million). [30]
On July 22, China's National Observatory issued a "blue alert" to Hainan province and the Beibu Gulf. About 22,901 fishing boats were moved while 39,425 people working at sea farms evacuated to Guangdong province. [16] Winds of 62–74 km/h (39–46 mph) were recorded over in some places, especially in areas around the Lingshui Li Autonomous County, as the storm neared the coast. [31] Southern portions of the province received rainfall of 3–6 in (8–15 cm) and tourists were stranded on a remote island off the coast of Guangdong. [32] Total economic losses in Hainan Province reached CNY 24 million (US$3.5 million). [33] In total, damage by Talas in China reached CNY 60 million (US$8.8 million). [34]
Other than Vietnam and Hainan, Laos, Myanmar and Thailand were affected with strong winds and heavy rains. Rainfall increased in Thailand between 15 and 18 July, reaching a peak of 145 mm (5.7 in) on 17 July in the Phu Phiang district of Nan province. [35] Multiple rivers in the Nan province, especially the Nan River, reportedly overflowed, causing three districts to flood. [36] The storm passed over the Laotian provinces of Xiangkhouang, Xaysomboun and Bolikhamsai early in the morning of 17 July. On that and the following day, rain caused landslides, flash flood and floods in areas of Central and Northern Laos. [37]
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