Typhoon Kajiki (2025)

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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)
  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

On August 20, a low-pressure area entered the PAR east of southeastern Luzon. [1] On August 22, the PAGASA upgraded the system, by then located east of Aurora, into a tropical depression and named it Isang. [2] The JMA also classified the system as a tropical depression at 01:10 UTC, while the JTWC issued a Tropical Cyclone Formation Alert (TCFA), citing favorable conditions for development in the coming days. [3] Later that day, Isang made landfall over Casiguran, Aurora at around 09:50 PHT (01:50 UTC). [4] At 15:00 UTC, the JTWC upgraded the system to a tropical depression, designating it as 19W,[ citation needed ] as it entered the West Philippine Sea. [5]

By 06:30 PHT on August 23 (22:30 UTC), Isang had emerged into the South China Sea, where it continued to intensify under highly favorable conditions, including low wind shear, warm sea surface temperatures, and southwestward upper-level diffluence. [6] [7] At 10:05 JST (01:05 UTC), 19W strengthened into a tropical storm and was named Kajiki by the JMA as it moved west-northwestward. However, while tracking east-northeast of Đà Nẵng, satellite imagery revealed that moderate 27–37 km/h (15–20 kn) vertical wind shear slightly hindered development, leaving the low-level circulation center (LLCC) partially exposed along the eastern edge of convection. Despite this, microwave imagery showed that deep convective banding wrapped into the circulation. [8] At 21:50 JST (12:50 UTC), the JMA upgraded Kajiki to a severe tropical storm as it steadily intensified while moving westwards along the southern periphery of the subtropical high. Both the JMA and the JTWC upgraded the storm into a typhoon early the next day, with the latter classifying it as a Category 1-equivalent typhoon. [9] The storm later developed a ragged eye, indicating that it underwent structural organization, which denoted a sign of intensification. Kajiki also depicted a well-defined LLCC, suggested that deep convection wrapped more tightly around the center. [10] At 14:00 UTC, the JTWC upgraded Kajiki into a Category 2-equivalent typhoon, noting its compact core, with a 23-nautical-mile-wide (43 km; 26 mi) eye, skirting the southern coast of the island of Hainan  [ yue; de; id; sv; uk; vi ]. [11] Afterwards, Kajiki slightly weakened, with satellite imagery depicted warming clouds along the western periphery of the typhoon, hinting a weakening trend as it neared the Gulf of Tonkin, where there was less ocean heat content. [12] Kajiki later underwent an eyewall replacement cycle, indicating the beginning of its weakening, with a compact inner core, a calm band surrounding it, and a developing secondary eyewall. However, the system still has a strong poleward and equatorward outflow. [13] [14] Kajiki made landfall between Nghệ An and Hà Tĩnh around 18:00 ICT (11:00 UTC) on August 25. Afterwards, the JTWC issued its final warning at 15:00 UTC as it moved inland. Meanwhile, the JMA continued to track Kajiki as it traversed Vietnam as a depression until the system, reportedly, dissipated at 18:00 UTC on August 26.

Preparations and impact

Philippines

As PAGASA started issuing advisories on Kajiki, Tropical Cyclone Wind Signal No. 1 warnings were issued over Abra, Apayao, Aurora, Benguet, Cagayan, Ifugao, Ilocos Norte, Ilocos Sur, Isabela, Kalinga, La Union, Mountain Province, Nueva Vizcaya, Pangasinan, Quirino, and the northern portion of Nueva Ecija. [15] The agency also warned that gale-force winds were also expected for some provinces in Luzon. [16] The Civil Aviation Authority of the Philippines (CAAP) reported several canceled domestic flights on August 22 due to the inclement weather caused by Kajiki. [17] Classes in Metro Manila and some parts of Luzon were also suspended on the same day. [18] Free rides on MRT Line 3, LRT Line 1 and Line 2 were announced shortly after the declaration of class suspensions in the city. [19]

The storm, along with the southwest monsoon, caused extensive flooding in Metro Manila. [20] Nearly 2,000 residents were evacuated from villages near the Mayon Volcano as heavy rains from the two weather systems were expected to trigger lahar flows and flash floods. [21] Meanwhile, the Department of Social Welfare and Development (DSWD) reported that over 3,627 families were affected by the storm and distributed ₱1.6 million( US$ 32,487.31) worth of aid to those affected. [22] [23] The National Disaster Risk Reduction and Management Council (NDRRMC) reported that 50,678 people in different regions were affected by the storm and the contribution of southwest monsoon, with Bangsamoro being the most affected region. Two houses in the Cordillera Administrative Region and Soccsksargen were partially damaged due to the two weather systems. The NDRRMC had also distributed assistance worth ₱1.71 million( US$ 34,640.51) to the victims. [22]

Hong Kong and Macau

In Hong Kong, the Hong Kong Observatory (HKO) issued Standby Signal No. 1 at 21:40 HKT (13:40 UTC) on August 22 [24] [25] [26] and replaced it with the Strong Monsoon Signal at 12:10 HKT on August 24 (04:10 UTC). [27] [28] In Macau, Signal No. 1 was hoisted at 01:00 MST on August 23 (17:00 UTC) [29] [30] [31] [ non-primary source needed ] and lowered at 13:00 MST (05:00 UTC) on August 24. [32]

China

In Hainan, a Level IV emergency response for flood and typhoon control was activated as strong winds and downpours are expected to hit its sea areas and islands. The National Meteorological Center of the China Meteorological Administration (CMA) also issued a yellow warning on August 23 in preparation for Kajiki. [33] On August 24, the agency in Sanya raised the typhoon warning to red, citing that Kajiki had gained more strength as it approaches the island. As a result, all classes, work, public transport, and maritime travel were suspended, including the closure of tourist sites.[ citation needed ]

Although the typhoon did not make a direct landfall in Hainan, heavy rain and strong winds battered the island and nearby parts of Guangdong province. [34] Xinhua News Agency said that more than 20,000 people were evacuated from hazardous areas while 30,769 fishing vessels were also docked ahead of the storm. [35] The province also stockpiled emergency supplies and more than 2,800 emergency responders, with necessary vehicles and rescue equipment were also on standby in order to mitigate the potential impacts from the typhoon. Authorities had also advised the public to remain indoors and avoid coastal zones and temporary structures. [36]

Vietnam

Authorities from Thanh Hóa to northern Quảng Trị raised the disaster risk as the storm neared the country. [37] Vietnam carriers, such as Vietnam Airlines and Vietjet canceled dozens of flights ahead of the storm. More than 325,000 residents in some coastal provinces were planned to evacuate as Kajiki approached the country. [38] Several coastal provinces also temporarily banned boats from leaving offshore on August 24. [39] Three passenger trains of Vietnam Railways were suspended in preparation for the typhoon. Authorities also warned the public to stay indoors and the risk of flash floods and landslides. Tho Xuan Airport [a] and Dong Hoi Airport [b] temporarily suspended operations on August 25 to ensure the safety of passengers, equipment, and facilities. [40]

Kajiki caused one fatality, injured eight people, [41] damaged or flooded 933 structures, uprooted 40,424 trees and affected 29,850 ha (73,800 acres) of crops in Hà Tĩnh province. [42] There was also one fatality each in Ninh Bình and Nghệ An provinces. [43] In Kim Hoa district  [ vi ], Hà Tĩnh province, one person was killed and another was seriously injured while repairing the roof of their home in preparation for the typhoon. [44] Flooding at a hydropower plant killed one worker and left two civilians missing in Sa Pa, Lào Cai province. [45] In total, Kajiki resulted in 47 injuries and left four individuals missing in Thanh Hóa, Tuyên Quang and Sơn La provinces. The widespread impact included 1.55 million people affected by power outages, [46] 17 buildings destroyed, and damage to or flooding of 34,756 homes, 380 schools, 102 boats, 44 health facilities, and 72 other structures. Additionally, 239 landslides disrupted traffic, and more than 116,700 ha (288,000 acres) of crops across the country were affected. [42] Damage in Nghệ An province exceeded ₫1.48 trillion( US$ 63.69 million). [47] Damage in Hà Tĩnh province reached ₫2.9 trillion( US$ 125.22 million) [48] and ₫358 billion( US$ 15.46 million) in Quảng Trị province. [49]

Elsewhere

In Khammouane province of Laos, heavy rainfall flooded eight villages. Flash floods also hit Xaysomboun province after several days of continuous rain, causing rivers to overflow and inundate homes and roads. [50]

The remnants of Kajiki caused heavy rain and flash flooding in Northern Thailand. [51] In Mae Suek, Chiang Mai Province, flooding and mudslides killed seven people, injured 24, left two others missing and damaged 57 homes. [52] [53] Flooding was also reported in the districts of Mae Chaem and Mae Hong Son. [51]

In Myanmar, Kajiki produced heavy rains across the country, causing flooding in Tatkon Township, where hundreds of people were evacuated. [54] In Pinlaung Township, Shan State, a landslide killed two people, injured 15 others and destroyed 15 homes. [55]

See also

Notes

References

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  2. "LPA east of Aurora develops into Tropical Depression Isang". Philippine Daily Inquirer . August 22, 2025. Retrieved 2025-08-22.
  3. "Tropical Cyclone Formation Alert (Invest 90W)". Joint Typhoon Warning Center. August 22, 2025. Retrieved 2025-08-22.
  4. "#IsangPH makes landfall in Casiguran, Aurora". GMA Regional TV . August 22, 2025. Retrieved 2025-08-22.
  5. "Tropical Depression Isang now over West PH Sea". ABS-CBN . August 22, 2025. Retrieved 2025-08-22.
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  7. "Isang develops into a tropical storm before leaving PAR Saturday". August 23, 2025.
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  17. "Thousands flee Mayon slopes as 'Isang' triggers lahar, flood threats". The Star. August 22, 2025. Retrieved 2025-08-24.
  18. "#WalangPasok: Class suspensions on Friday due to bad weather". The Philippine Star . August 22, 2025. Retrieved 2025-08-24.
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  26. "天文台發出一號戒備信號". August 22, 2025. Retrieved 2025-08-22.
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  42. 1 2 "Bão số 5, mưa lũ làm 8 người chết và mất tích, 47 người bị thương hàng chục nghìn ngôi nhà tốc mái". Báo Quân đội nhân dân (in Vietnamese). August 27, 2025. Retrieved 2025-08-27.
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  47. https://vov.vn/xa-hoi/tin-24h/thiet-hai-gan-1500-ty-dong-do-bao-so-5-nhieu-vung-o-nghe-an-van-ngap-sau-trong-nuoc-post1226179.vov
  48. "Hà Tĩnh thiệt hại hơn 2,900 tỷ đồng do bão số 5". Báo Hà Tĩnh (in Vietnamese). August 30, 2025. Retrieved 2025-08-30.
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  51. 1 2 "น้ำป่า-ดินสไลด์ อ.แม่แจ่ม เสียชีวิต 3 คน สูญหาย 6 คน". Thai Public Broadcasting Service (in Thai). August 27, 2025. Retrieved 2025-08-27.
  52. "พบผู้เสียชีวิตแล้ว 7 ราย เร่งค้นหาอีก 2 รายที่สูญหายโคลนถล่มบ้านปางอุ๋ง". Thairath (in Thai). August 30, 2025. Retrieved 2025-08-30.
  53. "เร่งค้นหาผู้สูญหายดินโคลนถล่มบ้านปางอุ๋ง ยอดผู้เสียชีวิตพุ่งเป็น 6 ศพ". Thairath (in Thai). August 28, 2025. Retrieved 2025-08-28.
  54. "နေပြည်တော်၊ တပ်ကုန်းမြို့ နယ်တွင် မိုးသည်ထန်စွာ ရွာသွန်းမှုနှင့် တောင်ကျချောင်းရေကြောင့် ရေကြီးနေပြီး ပြည်သူရာချီ၍ ကယ်ထုတ်င်္နေရ" [Heavy rain and torrential rains in Tatkon Township, Nay Pyi Taw have caused flooding, forcing hundreds of people to evacuate]. Democratic Voice of Burma (in Burmese). August 27, 2025. Retrieved 2025-08-27.
  55. "ကရင်ဖြူများလည်း နေထိုင်ရာ ပေါင်းလောင်းတွင် မိုးများတောင်ပြို၍ ၂ ဦး သေဆုံး". KIC News (in Burmese). August 28, 2025. Retrieved 2025-08-28.
Typhoon Kajiki (Isang)
Kajiki 2025-08-24 0910Z.jpg
Kajiki at peak intensity while approaching Hainan on August 24