Typhoon Koppu

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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
Disc Plain black.svg Tropical cyclone
Solid black.svg Subtropical cyclone
ArrowUp.svg Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

A tropical disturbance formed in a monsoon trough late on October 10, over Enewetak Atoll. [1] One day later, the Japan Meteorological Agency (JMA) upgraded the low-pressure area to a tropical depression, yet the low-level circulation center was exposed owing to strong vertical wind shear. [2] [3] On October 12, as the system kept consolidating with convection sheared to the west, the Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert; [4] half a day after, the JMA started to issue tropical cyclone warnings about the tropical depression. [5] The JTWC upgraded the system to a tropical depression early on October 13, although fragmented convective bands were wrapping tighter into a broad LLCC which remained exposed. [6] At noon, tracking westward along the southern periphery of the deep-layered subtropical ridge, the system intensified into a tropical storm and was named Koppu by the JMA. [7] [8]

Early on October 14, the storm entered the Philippine Area of Responsibility and received the name Lando from PAGASA, and deepened convection finally obscured the LLCC late on the same day, shortly before being upgraded to a severe tropical storm by the JMA. [9] [10] [11] Under a favorable environment of low vertical wind shear and radial outflow, Koppu deepened rapidly and intensified into a typhoon in the afternoon of October 15, when a tightly curved convective band was wrapping into an eye revealed by a microwave imagery. [12] [13] Intensification slowed down until an apparent but ragged eye formed one day later, as sea surface temperature was over 31 °C (88 °F) in the Philippine Sea. [14] The 35 km (22 mi) eye became sharper on October 17, prompting the JTWC upgrading Koppu to a super typhoon with one-minute maximum sustained winds at 240 km/h (150 mph) in the afternoon, equivalent to Category 4 of the Saffir–Simpson hurricane wind scale. [15] Around 01:00 PHT on October 18 (17:00 UTC on October 17), Koppu made landfall over Casiguran, Aurora in the Philippines; [16] however, the JMA then reported that Koppu reached its peak intensity with ten-minute maximum sustained winds at 185 km/h (115 mph) and the central pressure at 920 hPa (27 inHg). [17]

Frictional effects from land interaction with Luzon started to erode the typhoon rapidly after landfall, despite excellent dual outflow channels. [18] Before noon or in the afternoon on October 18, Koppu emerged into the South China Sea as a disorganized system which had begun to encounter with stronger easterly vertical wind shear. [19] Tracking northward very slowly along the western periphery of an extension of the deep-layered subtropical ridge to the east-northeast, the proximity to Luzon was inhibiting the system from consolidating, leading the JMA to downgrade Koppu to a severe tropical storm when main convection had been sheared to the west early on October 19. [20] [21] Both the JTWC and then the JMA downgraded the highly unorganized system with a ragged LLCC to a tropical storm in the afternoon. [22] [23] Continuing hugging the coast of Luzon on October 20, Koppu drifted northeastward and then east-northeastward due to embedded within a weak complex steering environment with a near-equatorial ridge to the south and an induced ridge between Typhoon Champi and Koppu; convective organization was also hampered by being embedded in a mid-level trough along the western periphery of the subtropical ridge. [24]

Preparations and impact

Highest PSWS raised by PAGASA across the Philippines in relation to Typhoon Koppu Lando PSWS.png
Highest PSWS raised by PAGASA across the Philippines in relation to Typhoon Koppu

PAGASA began issuing Public Storm Warning Signals (PSWS) for the Philippines starting on October 15, at which time Koppu was situated 755 km (469 mi) east of Baler, Aurora. The advised areas were initially concentrated around east-central Luzon. [25] As the typhoon intensified, the PSWS levels were raised and expanded. [26] At 09:00 UTC on October 17, PSWS #4—the second-highest level—was issued for Aurora Province as winds of 171 to 220 km/h (106 to 137 mph) were anticipated in the province within 12 hours; [27] this was expanded to include southern Isabela Province hours later. [28] Following the storm's landfall, PSWS were gradually lowered over the subsequent several days. [29] Nearly 24,000 people evacuated ahead of the typhoon's arrival while numerous schools, businesses, and government offices closed. A total of 88 flights were canceled. [30]

Downed trees and street flooding in Moncada, Tarlac, following Typhoon Koppu 09782jfPoblacion Trees Floods North South Highway Moncada Tarlacfvf 29.JPG
Downed trees and street flooding in Moncada, Tarlac, following Typhoon Koppu

Powerful winds caused widespread damage and disruption across Luzon. Nine provinces suffered total power outages and throughout the affected regions of Luzon, approximately 9 million people—roughly 10 percent of the entire nation—lost electricity. Aurora Province sustained a direct hit from the typhoon. Nearly every structure in Casiguran was damaged or destroyed. The nearby towns of Dinalungan and Dilasag were rendered inaccessible. [31] Torrential rains fell across much of region, with western coastal areas seeing the highest accumulations. [32] A storm total of 1,077.8 mm (42.43 in) was observed in Baguio, with 800 mm (31 in) falling in a 24-hour span. [33] Just south of Baguio at the San Roque Dam, an unconfirmed 24-hour accumulation of 1,317 mm (51.9 in), including 717 mm (28.2 in) in 12 hours, was reported. If verified, these would be the greatest 12- and 24-hour rainfall totals on record in the Philippines. [32] The heaviest rains were fairly concentrated, with Quezon City in Metro Manila to the south recording only 97.8 mm (3.85 in). Along the northwestern coast, Vigan saw 200.2 mm (7.88 in) accumulate. [33]

Approximately 1.24 million people were directly affected by the storm; at one point, 113,584 people moved to evacuation centers. Throughout the affected regions, 17,254 homes were damaged and 1,504 were destroyed. 62 people were killed, and total damage reached ₱14.4 billion (US$313 million). [34] [35]

In the central Philippines, two motorboats capsized in separate incidents resulting in a collective ten fatalities. [31] Virac and Daet saw 179.4 and 152.3 mm (7.06 and 6.00 in) of rain, respectively, as Koppu passed to the north. [33]

Highest Public Storm Warning Signal

Typhoon Koppu (Lando)
Koppu 2015-10-17 0530Z.jpg
Koppu approaching the Philippines prior to peak strength on October 17
IBTrACS OOjs UI icon edit-ltr-progressive.svg
PSWS#LuzonVisayasMindanao
4Aurora, Southern portion of IsabelaNoneNone
3Ilocos Norte, Ilocos Sur, Abra, Kalinga, Mountain Province, Rest of Isabela, La Union, Ifugao, Benguet, Nueva Vizcaya, Quirino, Pangasinan, Nueva Ecija, Zambales, Northern portion of Quezon including Polillo IslandsNoneNone
2Metro Manila, Batanes, Babuyan Islands, Apayao, Cagayan, Tarlac, Pampanga, Bataan, Bulacan, Rizal, Rest of Quezon, Camarines Norte, CatanduanesNoneNone
1Cavite, Laguna, Batangas, Lubang Island, Northern portion of Oriental Mindoro, Marinduque, Camarines Sur, AlbayNoneNone

Aftermath

Flooding and sediment caused by Koppu was seen over Pampanga River and Manila Bay on October 21 Koppu's flooding and sediment over Manila Bay and Pampanga River 2015-10-21 0250Z.jpg
Flooding and sediment caused by Koppu was seen over Pampanga River and Manila Bay on October 21

The Philippines' National Disaster Risk Reduction and Management Council (NDRRMC) has provided ₱122.8 million (US$2.67 million) worth of assistance. [34] On October 18, Australia was the first foreign government to offer support to typhoon relief. [36] On 22 October Australian Foreign Minister Julie Bishop announced A$1 million (US$726,000) in support to families affected by the typhoon. [37]

A state of calamity was declared for the provinces of Aurora, Cagayan, Isabela, Nueva Ecija, Nueva Vizcaya, Tarlac, Pangasinan, Quirino, three cities namely Dagupan, Ilagan and Tuguegarao, and to nine towns specifically Arayat, Baler, Cabatuan, Calumpit, Camiling, General Nakar, Infanta, Ramos and Sugpon owing to widespread flooding. [38] [39] [40]

Retirement

Due to the typhoon's destructive effects in the Philippines, the name Koppu was retired at the Fourth Joint Session of the ESCAP/WMO Typhoon Committee and WMO/ESCAP Panel on Tropical Cyclones during 2016. In February 2017, they chose the name Koguma to replace Koppu. The name Koguma was first used in the 2021 Pacific typhoon season. [41] PAGASA also announced that Lando will be removed from their naming lists and will never be used again. Its replacement name will be Liwayway which was first used in the 2019 Pacific typhoon season. [42] [43]

See also

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Severe Tropical Storm Kompasu, known in the Philippines as Severe Tropical Storm Maring was a very large and deadly tropical cyclone that affected the Philippines, Taiwan, and southeast China. Part of the 2021 Pacific typhoon season, Kompasu originated from an area of low pressure east of the Philippines on 6 October 2021. The Japan Meteorological Agency (JMA) classified it as a tropical depression that day. A day later, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) classified it as a tropical depression, naming it Maring. The cyclone was initially heavily disorganised, competing with another vortex, Tropical Depression Nando. Eventually, Maring became dominant, and the JMA reclassified it as a tropical storm, naming it Kompasu. Kompasu made landfall in Cagayan, Philippines, on 11 October 2021, and two days later, the storm made landfall in Hainan, China. The cyclone dissipated on 14 October 2021 while located over Vietnam.

References

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  30. ↑ SitRep No. 12 re Preparedness Measures and Effects of Typhoon "Landee" (Koppu) (PDF) (Report). National Disaster Risk Reduction and Management Council. October 21, 2015. Retrieved October 21, 2015.
  31. 1 2 Sean Breslin (October 21, 2015). "Typhoon Koppu Death Toll Rises; More Flooding Ahead for Philippines, Government Warns". The Weather Channel . Retrieved October 21, 2015.
  32. 1 2 Bob Henson and Jeff Masters (October 20, 2015). "Koppu Pulling Away from Philippines; TD 20-E May Threaten Mexico". Weather Underground. Retrieved October 20, 2015.
  33. 1 2 3 Nick Wiltgen (October 21, 2015). "Former Super Typhoon Koppu (Lando) Weakens to Remnant Low over Northern Philippines". The Weather Channel . Retrieved October 21, 2015.
  34. 1 2 "FINAL_REPORT_re_Preparedness_Measures_and_Effects_of_Typhoon_LANDO" (PDF). July 5, 2016.
  35. ↑ October 2015 Global Catastrophe Recap
  36. ↑ "Bill Tweddell on Twitter". Twitter. Retrieved 2015-10-18.
  37. ↑ "Australia supports Philippines after Typhoon Koppu". foreignminister.gov.au.
  38. ↑ Eva Visperas (October 22, 2015). "Pangasinan in state of calamity". The Philippine Star. Dagupan, Philippines. Retrieved October 22, 2015.
  39. ↑ Freddie G. Lazaro (October 21, 2015). "Cagayan placed under state of calamity". Manila Bulletin. Tuguegarao, Philippines. Retrieved October 22, 2015.
  40. ↑ Michael Bueva (October 23, 2015). "Typhoon Lando: 19 areas under state of calamity". Manila, Philippines. Retrieved October 24, 2015.
  41. ↑ "48th ESCAP/WMO Typhoon Committee - Session Report" (PDF). Retrieved 2024-02-07.
  42. ↑ Philippine News Agency (October 22, 2015). "PAGASA plans to decommission 'Lando' from list of typhoon names". Manila Bulletin. Retrieved October 22, 2015.
  43. ↑ Helen Flores (October 29, 2015). "Pagasa delists Lando". Philippine Star. Retrieved October 29, 2015.
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