Tropical Storm Kirogi (2017)

Tropical Storm Kirogi, known in the Philippines as Tropical Storm Tino, was a weak tropical cyclone that affected the Philippines and Vietnam. The thirty-ninth tropical depression, twenty-fifth tropical storm, and fourteenth system to affect Vietnam in the 2017 Pacific typhoon season,[1] Kirogi formed as a tropical depression on November 16 in the Moro Gulf. After being given the local name Tino by the PAGASA, it entered the South China Sea, intensifying into a tropical storm and receiving the name Kirogi from the Japan Meteorological Agency on November 18. Continuing westwards, it weakened into a tropical depression before making landfall near Cam Ranh Bay in Vietnam on the next day, dissipating shortly afterwards. Kirogi's remnants later contributed to the formation of Cyclone Ockhi.

This article is about the 2017 tropical storm. For other storms of the same name, see Typhoon Kirogi.
Tropical Storm Kirogi (Tino)
Kirogi at peak intensity on November 18
Meteorological history
FormedNovember 16, 2017
DissipatedNovember 19, 2017
Tropical storm
10-minute sustained (JMA)
Highest winds65 km/h (40 mph)
Lowest pressure1000 hPa (mbar); 29.53 inHg
Tropical storm
1-minute sustained (SSHWS/JTWC)
Highest winds75 km/h (45 mph)
Lowest pressure993 hPa (mbar); 29.32 inHg
Overall effects
Fatalities8 total
DamageMinimal
Areas affectedPhilippines, Vietnam
IBTrACS
Part of the 2017 Pacific typhoon season

Kirogi caused flooding in the Philippines and Vietnam, with trees and power poles toppling in Ho Chi Minh City. Eight people were killed in Vietnam.

Meteorological history
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 November 15 at 15:00 Coordinated Universal Time (UTC), the Joint Typhoon Warning Center (JTWC) began monitoring an area of convection approximately 355 nautical miles (655 km; 410 mi) east-southeast of Mindanao for potential development, estimating its development chances within the next day as low. The system was disorganized, with an exposed and ill-defined low-level circulation.[2] The system moved over more favorable conditions for development as the low-level circulation began to consolidate, and at 20:00 UTC, the JTWC upgraded the system's development chances within the next day to medium.[3] On November 16 at 12:00 UTC, the Japan Meteorological Agency (JMA) assessed that a tropical depression had formed over the Moro Gulf,[4] and at 21:00 UTC, the JTWC issued a Tropical Cyclone Formation Alert for the system.[5] On November 17 at 02:00 UTC, the PAGASA assessed that the system developed into a tropical depression, assigning it the local name Tino.[6] Four hours later at 06:00 UTC, the JTWC assessed that Tino had developed into a tropical depression, assigning it the designation 31W.[7] At 09:00 UTC, Tino made landfall on Puerto Princesa[6] before entering into the South China Sea. Tino entered the South China Sea as a disorganized system, with a weak low-level circulation and shallow convective bands. Conditions in the area were relatively favorable, with sea surface temperatures of 30 °C (86 °F), favorable outflow, and vertical wind shear at 15–20 knots (30–35 km/h; 15–25 mph) which was partially negated by the system's motion; development was partly limited due to northeasterly dry air.[8]

The JTWC upgraded Tino to a tropical storm at 18:00 UTC[7] as the system's low-level circulation became partially exposed;[9] the JMA followed on November 18 at 00:00 UTC, assigning it the international name Kirogi. The JMA estimated that Kirogi peaked in intensity at the same time, with maximum sustained winds of 65 km/h (40 mph) and a minimum central pressure of 1000 hPa (mbar; 29.53 inHg).[4] At 02:00 UTC, Kirogi left the Philippine Area of Responsibility[6] as its convection became displaced towards the west and northwest.[10] At 18:00 UTC, the JTWC estimated maximum 1-minute sustained winds of 75 km/h (45 mph);[7] convection began to fragment and collapse during the surrounding hours as an anticyclone continued to displace the convection, hindering the system's development.[11][12] On November 19 at 00:00 UTC, the JMA downgraded Kirogi to a tropical depression,[4] before making landfall south-southwest of Cam Ranh Bay[13] and being downgraded to a tropical depression by the JTWC at 06:00 UTC.[7] Kirogi was downgraded to a disturbance by the JTWC at 12:00 UTC,[7] with the JMA estimating the system to have dissipated.[4] Kirogi's remnants would later move into the Gulf of Thailand on November 20[14] and into the Andaman Sea on November 21,[15] later contributing to the formation of Cyclone Ockhi.[16]

Preparations and impact

Philippines

Signal #1 warnings were raised for the province of Palawan by the PAGASA on November 17 at 03:00 UTC.[17] Warnings remained for Palawan until later that day at 15:00 UTC.[18] The PAGASA advised against sea travel due to rough seas, also warning residents of the possibility of landslides and flooding.[19] In Davao City, several families evacuated due to flooding.[6] Over 200 people in Taytay, Palawan, San Vicente, Palawan, and Roxas, Palawan were evacuated. On November 17, Culion and Puerto Princesa suspended classes for the day.[20] Almost 100 people were evacuated in Mansalay, Oriental Mindoro. Bad weather prompted the cancellation of five domestic flights.[21]

Several barangays in Mansalay were affected by floodwaters 0.5–1 meter (1.6–3.3 ft) deep; San Vicente received floods 1 metre (3.3 ft) deep. Three houses were damaged in Palawan; ports in Puerto Princesa, Coron, Palawan, Cuyo, Palawan, El Nido, Palawan, and Brooke's Point temporarily suspended operations, stranding 243 passengers. A total of 497 people were affected as a result of the storm.[6]

Vietnam

The National Center for Hydro-Meteorological Forecasting issued emergency warnings for Bình Thuận Province, Khánh Hòa Province, and Ninh Thuận Province from November 18–19.[1] Ninh Thuận ordered fishing boats to anchor in storm shelters before the end of November 18. By the next day, more than 2,600 boats entered storm shelters, with 535 others at sea also having been reported to have sought shelter. Five households in Thuận Bắc District were evacuated; residents and tourists were advised and warned to move away from areas close to the shore.[22] Flood warnings were issued for rivers in Bình Thuận, Central Highlands, Đồng Nai Province, and Hà Tĩnh Province from November 19–24. People living in vulnerable areas were evacuated, with local authorities making plans for reinforcing structures and further evacuations.[23]

Trees in Ho Chi Minh City were uprooted due to strong winds, with several streets experiencing 300 millimetres (12 in) of flooding.[24] Roofs were also blown off of houses in the city, with fallen power poles causing power outages. Flooding on National Route 50 reached depths of 1 metre (3.3 ft).[25] 8,289 buildings were flooded, of which 7,966 were in Thừa Thiên Huế Province and 323 were in Quảng Trị Province. Several hundred meters of embankments for the Hiếu River were damaged by flooding in Cam Lộ. Water was released from reservoirs in Central Vietnam and the Central Highlands due to high water levels. In Mỹ Chánh, Quảng Trị, a reported 300 millimetres (12 in) of rain fell within 24 hours.[26] 182 millimetres (7.2 in) of rain was reported in Qui Nhơn, with Huế reporting 142 millimetres (5.6 in) of rain.[27] 517 hectares (1,280 acres) of rice and 60 hectares (150 acres) of other crops were damaged. Eight fatalities were reported by the Vietnam Disaster Management Authority.[28]

Elsewhere

On November 19 in Ko Kut, 82.4 millimetres (3.24 in) of rainfall was recorded in 24 hours.[29] The Thai Meteorological Department advised residents of the possibility of flash floods, strong winds, and storm surge, also cautioning ships of waves forecasted to reach 2 meters (6.6 ft).[30]

See also

References
  1. "Situation Update No. 6 Final for Typhoon Damrey, Viet Nam" (PDF). ASEAN Coordinating Centre for Humanitarian Assistance. November 18, 2017. p. 2. Retrieved June 12, 2021.
  2. "Significant Tropical Weather Advisory for the Western and South Pacific Oceans Reissued from 151500Z–160600Z November 2017". Joint Typhoon Warning Center. November 15, 2017. Archived from the original on July 30, 2017. Retrieved June 9, 2021 – via National Oceanic and Atmospheric Administration.
  3. "Significant Tropical Weather Advisory for the Western and South Pacific Oceans Reissued from 152000Z–160600Z November 2017". Joint Typhoon Warning Center. November 15, 2017. Archived from the original on July 30, 2017. Retrieved June 9, 2021 – via National Oceanic and Atmospheric Administration.
  4. Annual Report on the Activities of the RSMC Tokyo - Typhoon Center 2017 (PDF) (Report). Japan Meteorological Agency. December 27, 2018. pp. 43, 102. Retrieved June 10, 2021.
  5. "WTPN21 PGTW 162100". Joint Typhoon Warning Center. November 16, 2017. Archived from the original on August 5, 2017. Retrieved June 10, 2021 – via National Oceanic and Atmospheric Administration.
  6. SitRep No. 03 re Preparedness Measures and Effects of Tropical Storm "Tino" (PDF) (Report). National Disaster Risk Reduction and Management Council. November 19, 2017. Retrieved June 10, 2021.
  7. Chu, J H.; Levine, A.; Daida, S.; et al. "2017 Western North Pacific Ocean Best Track Data". Joint Typhoon Warning Center. Retrieved June 10, 2021.
  8. "Prognostic Reasoning for Tropical Depression 31W (Thirtyone) Warning NR 01". Joint Typhoon Warning Center. November 17, 2017. Archived from the original on July 29, 2018. Retrieved June 10, 2021 – via National Oceanic and Atmospheric Administration.
  9. "Prognostic Reasoning for Tropical Storm 31W (Thirtyone) Warning NR 02". Joint Typhoon Warning Center. November 17, 2017. Archived from the original on August 4, 2017. Retrieved June 10, 2021 – via National Oceanic and Atmospheric Administration.
  10. "Prognostic Reasoning for Tropical Storm 31W (Kirogi) Warning NR 04". Joint Typhoon Warning Center. November 18, 2017. Archived from the original on August 4, 2017. Retrieved June 10, 2021 – via National Oceanic and Atmospheric Administration.
  11. "Prognostic Reasoning for Tropical Storm 31W (Kirogi) Warning NR 05". Joint Typhoon Warning Center. November 18, 2017. Archived from the original on August 4, 2017. Retrieved June 10, 2021 – via National Oceanic and Atmospheric Administration.
  12. "Prognostic Reasoning for Tropical Storm 31W (Kirogi) Warning NR 06". Joint Typhoon Warning Center. November 18, 2017. Archived from the original on August 4, 2017. Retrieved June 10, 2021 – via National Oceanic and Atmospheric Administration.
  13. Gutro, Rob (November 18, 2017). "NASA Spots Tropical Depression Kirogi Dissipating". NASA. Retrieved June 10, 2021.
  14. Sakudomchai, Wanchai (November 20, 2017). "Weather Warning "Tropical Depression 'Kirogi' " No. 12". Thai Meteorological Department. Retrieved June 12, 2021.
  15. Kurian, Vinson (November 21, 2017). "N-E monsoon may revive next week, last into mid-December". Business Line. Retrieved June 11, 2021.
  16. Very Severe Cyclonic Storm "Ockhi" over Bay of Bengal (29 November–06 December 2017): A Report (PDF) (Report). India Meteorological Department. p. 1. Archived from the original (PDF) on September 30, 2020. Retrieved June 11, 2021.
  17. "Low pressure area now Tropical Depression Tino". Rappler. November 17, 2017. Retrieved June 11, 2021.
  18. "Tropical Depression Tino begins to move away from PH". Rappler. November 17, 2017. Retrieved June 11, 2021.
  19. "'Tino' makes landfall over Palawan". ABS-CBN News and Current Affairs. November 17, 2017. Retrieved June 11, 2021.
  20. "#TinoPH leaves country as intensified tropical storm". CNN Philippines. November 18, 2017. Retrieved June 11, 2021.
  21. "#TinoPH brings rains ahead of Palawan landfall". CNN Philippines. November 17, 2017. Retrieved June 11, 2021.
  22. "AHA Centre Flash Update #2 for Tropical Storm Kirogi (31)". ASEAN Coordinating Centre for Humanitarian Assistance. November 19, 2017. Retrieved June 12, 2021 – via ReliefWeb.
  23. "AHA Centre Flash Update #1 for Tropical Storm Kirogi (31)". ASEAN Coordinating Centre for Humanitarian Assistance. November 18, 2017. Retrieved June 12, 2021 – via ReliefWeb.
  24. An, Xuan (November 18, 2018). "Heavy rain floods Saigon as Storm Kirogi approaches south-central Vietnam". VnExpress. Retrieved July 19, 2021.
  25. "Downpour inundates streets, unroofs houses in Ho Chi Minh City". Tuổi Trẻ. November 19, 2017. Retrieved July 19, 2021.
  26. Davies, Richard (November 22, 2017). "Vietnam – 2 Dead, 1 Missing After Floods in Central Areas". FloodList. Retrieved June 12, 2021.
  27. "Tropical Storm Kirogi hits Vietnam". Al Jazeera. November 20, 2017. Retrieved June 12, 2021.
  28. Phụ Lục Tổng Hợp Thiệt Hại Do Thiên Tai Năm 2017 (PDF) (Report) (in Vietnamese). Vietnam Disaster Management Authority. p. 1. Retrieved January 16, 2022.
  29. "Monthly Weather Summary in Thailand November 2017" (PDF). Thai Meteorological Department. p. 2. Retrieved June 12, 2021.
  30. Sakudomchai, Wanchai (November 20, 2017). "Weather Warning "Tropical Depression 'Kirogi' " No. 11". Thai Meteorological Department. Retrieved June 12, 2021.
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