Tropical Storm Pulasan

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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

Tropical Storm Pulasan emerged from an area of atmospheric convection 196 km (122 mi) west-southwest of Andersen Air Force Base, Guam on September 14. [1] Satellite imagery indicates a broad, elongated area of circulation obscured by flaring and disorganized deep convection, with the disturbance situated in a favorable environment for development. [1] At 00:00 UTC on September 15, the Japan Meteorological Agency (JMA) designated the system as a low-pressure area, having previously identified it as a tropical depression. [2] [3] The United States Joint Typhoon Warning Center (JTWC) issued a tropical cyclone formation alert, noting that the system was disorganized, deep, fragmented, and had flaring convection obscuring the low-level circulation. [4] Shortly after, the depression intensified into a tropical storm and was named Pulasan by the JMA. [5] Pulasan was characterized by a large cyclonic circulation exceeding 690 miles (1,111 km) and extensive gale-force winds, leading the JTWC to classify it as a monsoon depression at 06:00 UTC on September 16, [6] before later upgrading it to a tropical storm and designating it as 15W. [7]

Pulasan was progressing north-northeastward along the northwestern edge of a mid-level subtropical high, with a band of enhanced winds encircling the eastern edge, accompanied by deep convection, [8] while the center stayed clear and was supplied with dry air from a tropical upper tropospheric trough cell to the west. [9] By 11:00 PHT (03:00 UTC) on September 17, Pulasan had entered the Philippine Area of Responsibility (PAR) and was subsequently named Helen by the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA). [10] The JMA reported that Pulasan reached its peak intensity at 06:00 UTC, with 10-minute sustained winds of 85 km/h (50 mph) and a central pressure of 992 hPa (29.29 inHg), [11] before ultimately peaking with 1-minute sustained winds of 110 km/h (70 mph). [12] Pulasan's low-level circulation has remained broad and somewhat exposed, [13] as dry air continues to encircle its southern side while the system moves northwestward along the southwestern edge of a mid-level subtropical high. [14] Pulasan exited the PAR on September 18 while traversing Okinawa Island in Japan's Ryukyu Archipelago as its circulation center strengthened with persistent convection, [15] and satellite imagery displayed flaring convection along with weak easterly outflow over the East China Sea. [16] [17] On September 19, Pulasan made landfall in Zhoushan, Zhejiang, followed by a second landfall in Shanghai, just days after Typhoon Bebinca affected the Shanghai area. [18] [19] As the storm moved overland, it maintained a well-defined circulation center; [20] however, the system gradually turned northeastward under the influence of mid-latitude prevailing westerlies. [21] Pulasan reemerged over the East China Sea, just off the coast of Jiangsu, China, showcasing a large, near-symmetric area of deep convection to the southeast on September 20. [22] Meanwhile, satellite imagery and surface reports from Jeju Island indicated that it was in the earliest phase of extratropical transition, with vigorous deep convection occurring over the southern semicircle. [23] By 06:00 UTC on September 21, the JMA reported that Pulasan had transitioned into an extratropical low as it moved east-northeastward and became embedded within the polar front jet to the north, [24] passing over southern South Korea. [25] The JTWC then ceased issuing advisories on the system as it underwent frontogenesis while entering the baroclinic zone. [26] The extratropical storm entered the Sea of Japan on September 22, crossed the Tōhoku region, and then emerged into the Pacific Ocean while being absorbed by another extratropical cyclone. [27] The extratropical remnants of Pulasan were last noted by the JMA on September 24 near the International Dateline; [28] however, the Ocean Prediction Center indicated that these remnants crossed the International Dateline and entered the Central North Pacific Ocean late on September 25. [29] The remnants gradually approached the coast of British Columbia, [30] making landfall on September 27, [31] moving inland, [32] and dissipating the same day. [33]

Preparations and impact

The Yangjiazhai meteorological station in Fengxian District and the Nicheng Park meteorological station in Pudong District both recorded more than 300 mm (12 in) of rainfall within a six-hour period, breaking historical records for each district since meteorological observations began. [34] Due to Pulasan, winds of 83 km/h (52 mph) were recorded in Fengxian, Shanghai, where several roads and neighborhoods were flooded. [35] Xinhua reported that the city evacuated 112,000 people and suspended some ferry and train services. [36] PAGASA reported that the southwest monsoon, enhanced by Soulik and Pulasan, will bring strong to gale-force winds across the Philippines. [37]

Tropical Storm Pulasan regenerating over the East China Sea on September 21 2024 CIMSS 15W Pulasan visible infrared satellite loop.gif
Tropical Storm Pulasan regenerating over the East China Sea on September 21

As Pulasan approached Japan, 44,700 residents from Wajima, Suzu, and Noto in Ishikawa Prefecture were given evacuation orders, along with 16,000 others in Yamagata and Niigata Prefectures. [38] The Japan Meteorological Agency issued the highest level of alert for heavy rain across several cities in Ishikawa. [39] Heavy rains caused by Pulasan triggered widespread landslides and flooding in the Noto Peninsula, causing extensive damage which was exacerbated by the 2024 Noto earthquake which devastated the region in January. [39] The floods killed 14 people, injured 47 and damaged 770 houses across the region. [40] [41] [42] [43] In Wajima, 120 mm (4.7 in) of rainfall was recorded within an hour. [44] Up to ten people were left missing in the town, including four due to a landslide at a construction site. [44] In Suzu, one person drowned and another was missing. In Noto, one person was missing and two others were critically injured after a landslide struck their home. At least twelve rivers across Ishikawa overflowed, and 6,500 households were left without power in the prefecture, according to Hokuriku Electric Power Company. [39]

At least 903 people from 581 households were evacuated across six provinces in South Korea. [45] In South Korea, the cities of Changwon, Yeosu and Busan recorded 519.2 mm (20.44 in), 399.5 mm (15.73 in) and 390.2 mm (15.36 in) of rainfall respectively on September 21. Flooding affected 83 sections of public roads, leading to 18 incidents of soil loss and a wall collapse, 30 private facilities and 27 houses. Two trucks fell into a sinkhole in Busan. [45] In Yangju city, Gyeonggi province, an elderly man died after being swept away by a torrent. [46] A total of 27 private homes were flooded, affecting almost 30 private businesses, including shops and factories. Moreover, 641 areas within 22 national parks throughout the country were still unreachable. [47] The remnants of Tropical Storm Pulasan have caused wind warnings for several areas in British Columbia, including the B.C. Coast, sections of Vancouver Island, the Central Coast, and Haida Gwaii, [48] while approximately 15,000 customers lost power, primarily on Vancouver Island, especially in Campbell River and Courtenay. [49]

See also

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References

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  2. ↑ Warning and Summary 150000 (Report). Tokyo, Japan: Japan Meteorological Agency. September 15, 2024. Archived from the original on September 15, 2024. Retrieved September 15, 2024.
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  35. ↑ "Typhoon Pulasan floods Shanghai". Voice of America. 20 September 2024. Retrieved 21 September 2024.
  36. ↑ "China's Shanghai hit by second major typhoon in a week – DW – 09/20/2024". dw.com. Retrieved 2024-09-24.
  37. ↑ "Tropical Cyclone Bulletin #1 for Tropical Storm 'Helen' (Pulasan)" (PDF). PAGASA . 18 September 2024. Retrieved 18 September 2024.
  38. ↑ "Japan orders evacuations as heavy rains trigger floods in earthquake-hit region". Manila Standard . 21 September 2024. Retrieved 21 September 2024.
  39. 1 2 3 "Heavy rain triggers deadly landslides and floods in Japan". Ludlow Advertiser. 21 September 2024. Retrieved 21 September 2024.
  40. ↑ "【能登豪雨 更新中】孤立集落は56カ所　死者7人、行方不明2人". The Asahi Shimbun (in Japanese). 23 September 2024. Retrieved 23 September 2024.
  41. ↑ "令和６年９月２０日からの大雨による被害及び 消防機関等の対応状況 (第２３報)" (PDF) (in Japanese). FDMA. 20 September 2024. Retrieved 6 October 2024.
  42. ↑ "【能登豪雨 更新中】孤立集落は56カ所　死者7人、行方不明2人". The Asahi Shimbun (in Japanese). 23 September 2024. Retrieved 23 September 2024.
  43. ↑ "石川・能登地方で大雨により6人死亡10人不明　仮設住宅770棟以上が床上浸水" (in Japanese). Fuji News Network. 22 September 2024. Retrieved 22 September 2024.
  44. 1 2 "One Dead, 7 Missing As Heavy Rains Trigger Floods In Central Japan". Channels TV. 21 September 2024. Retrieved 21 September 2024.
  45. 1 2 "Over 900 evacuated as heavy rain floods homes, roads in southern S. Korea". Yonhap News Agency. 21 September 2024. Retrieved 21 September 2024.
  46. ↑ "South Korea's southern region experienced its heavy rain in 200 years and 1,500 people were evacuated". Yonhap News Agency. 22 September 2024. Retrieved 22 September 2024.
  47. ↑ "Over 900 evacuated as heavy rain floods homes, roads in southern South Korea". en.inform.kz. September 23, 2024. Retrieved September 23, 2024.
  48. ↑ Crawford, Emma (2024-09-27). "Wind warnings in effect across B.C. coast, other areas of province". CityNews Vancouver. Retrieved 2024-09-28.
  49. ↑ "'A miracle nobody got hurt': Residents worry tree will fall during storm season". Comox Valley Record. 2024-09-28. Retrieved 2024-09-28.
Tropical Storm Pulasan (Helen)
Pulasan 2024-09-18 0100Z.jpg
Pulasan approaching eastern China on September 18
Tropical cyclones of the 2024 Pacific typhoon season
2024 Pacific typhoon season summary.png
TY
Ewiniar
TS
Maliksi
TD
03W
STS
Prapiroon
VSTY
Gaemi
VSTY
Ampil
STS
Maria
TS
Son-Tinh
TS
Wukong
TS
Jongdari
TD
TD
TD
TD
TD
TD
VSTY
Shanshan
TD
TD
VITY
Yagi
TD
Hone
TS
Leepi
TD
TD
TY
Bebinca
TS
Soulik
TS
Pulasan
TD
Igme
TS
Cimaron
TS
Jebi
TD
TD
VITY
Krathon
TD
21W
TD
TD
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