Tropical Storm Kai-tak

Tropical Storm Kai-tak, known in the Philippines as Tropical Storm Urduja, was a late-season tropical cyclone that affected Visayas during December 2017. Forming as the twenty-sixth named storm of the 2017 Pacific typhoon season, Kai-tak formed as a tropical depression near Palau on December 11. Slowly intensifying, the system became a tropical storm on December 14. Due to its slow motion, Kai-tak made landfall in Samar on December 16, and traversed the Philippine islands. Kai-tak later moved in a west-southwestward direction until it dissipated on December 23 near Malaysia.

Tropical Storm Kai-tak (Urduja)
Tropical storm (JMA scale)
Tropical storm (SSHWS)
Tropical Storm Kai-tak making landfall in the Philippines on December 16
FormedDecember 13, 2017
DissipatedDecember 23, 2017
Highest winds10-minute sustained: 75 km/h (45 mph)
1-minute sustained: 95 km/h (60 mph)
Lowest pressure994 hPa (mbar); 29.35 inHg
Fatalities83 total
Damage$74.3 million (2017 USD)
Areas affectedCaroline Islands, Philippines, Malaysia
Part of the 2017 Pacific typhoon season

Meteorological history

Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
Map key
  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)
Storm type
Extratropical cyclone / Remnant low / Tropical disturbance / Monsoon depression

On December 10, the Joint Typhoon Warning Center (JTWC) began to monitor on a tropical depression located about 130 km (81 mi) to the east of Palau.[1] The Japan Meteorological Agency (JMA) classified the system as a weak tropical depression the next day,[2] and began issuing advisories on 00:00 UTC of December 12.[3] Nine hours later, the PAGASA declared that the system had intensified into a tropical depression, and was immediately given the local name Urduja.[4] On December 13, the JTWC issued a Tropical Cyclone Formation Alert.[5] On 21:00 UTC of that same day, the JTWC upgraded the system to a tropical depression and also began issuing advisories, giving the identifier 32W.[6] Despite the system being poorly organized with loose banding, the system also was located in an area of very low wind shear.[7] Three hours later, the JMA upgraded the system to a tropical storm, assigning it the international name Kai-tak.[8]

Preparations and impact

On December 14, as soon as PAGASA upgraded Kai-tak (Urduja) to a tropical storm, Public Storm Warning Signal #2 was immediately raised in Eastern Samar, Samar and Biliran.[9] Public Storm Warning Signal #1 was also raised in the majority of Bicol Region (Region V) and much of Visayas while moderate to heavy rainfall were warned within the 400-km diameter of the storm.[9] Residents were already advised to "undertake appropriate measures" against flooding as the moderate to heavy rainfall area was extended to within the 500-km diameter on December 15. PAGASA also announced the possibility of a storm surge of 4.1–14 meters over in Samar.[10] The city of Tacloban was later placed under a state of calamity as decided by their local council as 80 of the 130 villages were flooded. This resulted in at least 728 families (1,418 individuals) brought to evacuation centers or schools.[11]

Animation of issued PSWS for Tropical Storm Kai-Tak (Urduja) when crossing the Philippines.

The NDRRMC confirmed a total of 83 people dead and calculated a total of Php3.747 billion (US$74.3 million) worth of infrastructure and agricultural damages.[12][13]


On December 21, 2017, the PAGASA announced that the name Urduja had been retired from their naming lists after causing more than ₱1 billion worth of damage.[14] In January 2018, PAGASA chose the name Uwan to replace Urduja for future seasons.

Due to the damage and high death toll in Visayas, the name Kai-tak was officially retired during the 50th annual session of the ESCAP/WMO Typhoon Committee in February 2018. In February 2019, the Typhoon Committee subsequently chose Yun-yeung as its replacement name.[15]

See also


  1. "Archived copy". Archived from the original on 2017-12-11. Retrieved 2017-12-11.{{cite web}}: CS1 maint: archived copy as title (link)
  2. "Archived copy". Archived from the original on 2017-12-12. Retrieved 2017-12-12.{{cite web}}: CS1 maint: archived copy as title (link)
  3. "RSMC Tropical Cyclone Advisory TD". Japan Meteorological Agency. December 12, 2017. Archived from the original on December 12, 2017.
  4. Julius N. Leonen (December 12, 2017). "LPA turns into Tropical Depression Urduja". Inquirer.
  5. "Archived copy". Archived from the original on 2017-12-14. Retrieved 2017-12-14.{{cite web}}: CS1 maint: archived copy as title (link)
  6. "Tropical Depression 32W (Thirty-two) Warning Nr 001". December 13, 2017. Archived from the original on December 14, 2017.
  7. "Prognostic Reasoning for Tropical Depression 32W (Thirty-two) Warning Nr 01". December 13, 2017. Archived from the original on December 15, 2017.
  8. "RSMC Tropical Cyclone Advisory TS 1726 KAI-TAK (1726) UPGRADED FROM TD". Japan Meteorological Agency. December 14, 2017. Archived from the original on December 14, 2017.
  9. Julius N. Leonen (December 14, 2017). "'Urduja' intensifies into tropical storm". Inquirer.
  10. "Tropical Storm Urduja maintains strength, 'almost stationary' off Eastern Samar". GMA News. December 15, 2017.
  11. "Tacloban under state of calamity due to 'Urduja'". SunStar Philippines. December 15, 2017.
  12. "SitRep_No_28_re_Preparedness_Measures_and_Effects_of_Tropical_Storm-URDUJA_KAI-TAK" (PDF). NDRRMC. February 7, 2018.
  13. "Companion Volume to Weather, Climate & Catastrophe Insight" (PDF). Aon Benfield. Retrieved 30 January 2018.
  14. "Urduja removed from PAGASA name list as damage exceeds P1 billion". GMA News. December 21, 2017.
  15. "Replacement Names of TEMBIN, HATO and KAI-TAK in the Tropical Cyclone Name List" (PDF). ESCAP/WMO Typhoon Committee. February 19, 2019.
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