Typhoon Jangmi (2008)

This article is about the 2008 typhoon. For other storms of the same name, see List of storms named Jangmi and List of storms named Ofel.
Typhoon Jangmi (Ofel)
Typhoon Jangmi near peak intensity on September 27
Meteorological history
FormedSeptember 23, 2008
ExtratropicalOctober 1, 2008
DissipatedOctober 5, 2008
Violent typhoon
10-minute sustained (JMA)
Highest winds215 km/h (130 mph)
Lowest pressure905 hPa (mbar); 26.72 inHg
Category 5-equivalent super typhoon
1-minute sustained (SSHWS/JTWC)
Highest winds260 km/h (160 mph)
Lowest pressure918 hPa (mbar); 27.11 inHg
Overall effects
Fatalities6
Missing2
Damage$87.7 million (2008 USD)
Areas affectedTaiwan, eastern China, Japan
IBTrACSEdit this at Wikidata
Part of the 2008 Pacific typhoon season

Typhoon Jangmi (pronounced [tɕaŋ.mi]), known in the Philippines as Super Typhoon Ofel, was the most intense tropical cyclone in the Northwest Pacific Ocean during the 2000s, tied with Nida in 2009, and the most intense tropical cyclone worldwide in 2008.[1] Jangmi, which means rose in Korean, formed in a low pressure area south of Guam on September 22. After undergoing serious consolidating with convective banding, the low pressure area was upgraded to a Joint Typhoon Warning Center late the same data. Undergoing the same process, the storm developed into a tropical storm on September 24. Undergoing rapid deepening on September 26–27, the storm, now a Super Typhoon entered the Philippine Area of Responsibility, and was named Ofel. The next day, Jangmi made impact in Taiwan, thousands were evacuated, rainfall, up to 994mm were recorded, and thousands of acres of farmland were destroyed. Jangmi was significantly weakened as it interacted with Taiwan, as being downgraded to tropical storm status after leaving Taiwan on September 29. After undergoing an extratropical transition, Jangmi became a remnant low on October 1. After slowly moving eastward, until finally dissipating near Iwo Jima on October 5.

Jangmi killed 2 people and caused about $77.8 million (2008 USD) in damage in Taiwan, as well as the typhoon also made operations of Maokong Gondola suspended due to erosion around a pillar, until March 30, 2010.[2][3] When Jangmi was weakening and becoming extratropical, it killed 4 people and caused about $9.9 million (2008 USD) in damage in Japan.[4]

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

A low-pressure area formed south of Guam on September 22.[5] On the next day, the Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert on the system. Owing to the low-level circulation center (LLCC) rapidly consolidating with convective banding, JTWC upgraded it to a tropical depression late on the same day. Overall, the environment was favorable for further development, with a developing anticyclone over the LLCC, weak vertical wind shear, and good poleward outflow due to a cold-core low north of the system.[6]

Early on September 24, JTWC upgraded the system to a tropical storm; however, according to RSMC Best Track Data, the system intensified into a tropical depression at the same time. At noon, the Japan Meteorological Agency (JMA) upgraded the system to a tropical storm and named it Jangmi, when it was tracking northwestward under the steering influence of the subtropical ridge in the northeast.[7] Several hours later, Jangmi entered the Philippine Area of Responsibility, earning the name Ofel from the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA).[8]

Shortly after JMA upgraded Jangmi to a severe tropical storm early on September 25, JTWC upgraded it to a typhoon for its developing eye; moreover, according to RSMC Best Track Data, Jangmi intensified into a typhoon simultaneously.[9] Tracking toward a weakness in the subtropical ridge induced by a mid-latitude trough to the north-northeast on September 26, Jangmi formed an cirrus-filled and ambiguous eye, as the typhoon gradually intensified owing to strong radial outflow provided by a mesoscale anticyclone aloft, which persisted into a tropical upper tropospheric trough cell to the east.[10]

Typhoon Jangmi approaching Taiwan on September 28

At 00Z on September 27, JTWC upgraded Jangmi to a super typhoon, with a round 28 nautical miles (52 km; 32 mi) eye with an intense and symmetric core of deep convection and excellent convective banding over all quadrants.[11] Six hours later, the typhoon reached category 5 strength on the Saffir–Simpson hurricane wind scale. At 12Z, Jangmi attained peak intensity by the ten-minute maximum sustained winds reaching 115 knots (215 km/h, 130 mph) and the atmospheric pressure decreasing to 905 hPa (26.7 inHg). In terms of ten-minute maximum sustained winds, it became the most intense tropical cyclone in the Northwest Pacific Ocean since Angela in 1995, tied with Nida in the next year, until Megi surpassed all of them in 2010.

Jangmi weaken gradually due to land interaction with Taiwan early on September 28. After JTWC downgraded Jangmi to a typhoon, it made landfall over Nan'ao in Yilan, Taiwan at 15:40 TST (07:40 UTC) with ten-minute maximum sustained winds of 100 knots (185 km/h, 115 mph) and an atmospheric pressure of 925 hPa (27.3 inHg).[2] Because of the frictional effects of land, the typhoon showed trochoidal motion overland, unexpectedly shifting toward the south-southwest shortly. Jangmi weakened significantly by the mountainous terrain of Taiwan after landfall; therefore, it lost the majority of deep convection. Under the steering influence by the eastern subtropical ridge, the system began to track northward toward a break situated east of Shanghai, China, and it arrived at the Taiwan Strait from Taoyuan County (now Taoyuan City) at 04:20 TST on September 29 (20:20 UTC on September 28).[12][2]

Early on September 29, Jangmi weakened into a severe tropical storm in the East China Sea, when JTWC downgraded it to a tropical storm. Despite lacking significant deep convection, the storm still had good radial outflow, especially the poleward outflow tapped into strong mid-latitude westerlies. As JMA downgraded Jangmi to a tropical storm at noon, the system started to track northeastward along the weakened western finger of the subtropical ridge.[13] Jangmi underwent extratropical transition while accelerating east-northeastward and then eastward on September 30, as well as upper-level westerly winds sheared the remaining convection to the east and south of the low-level circulation center with frontal features. Late on the same day, JTWC reported that Jangmi became extratropical with a final warning.[14]

JMA reported that Jangmi became an extratropical cyclone near the Ōsumi Islands early on October 1, and the system kept moving eastward rapidly during that day. Remaining weak and shallow, it began to drift east-southeastward slowly by early on October 2. Since the noon on the same day, the system turned to drift southward very slowly. It ultimately dissipated near Iwo Jima on October 5.

Impacts

Taiwan

The Xindian Creek on September 28

Typhoon Jangmi brought torrential rainfall throughout the mountains in Taiwan on September 27–29, where were already severely affected by Typhoon Sinlaku in early September. 1,134 mm (44.6 in) of precipitation was recorded at Taiping Mountain in Datong, Yilan. Jangmi also brought 994 mm (39.1 in) in Zhuqi, Chiayi and 857 mm (33.7 in) in Beitou, Taipei. 3,661 people were evacuated, and 1,040,880 residences in Taiwan lost power because of the typhoon.[15]

The typhoon caused 2 fatalities and 61 injures in Taiwan, while 2 people are still missing. On National Highway No. 5 in Su'ao, Yilan, a bus was blown over by the strong winds, injuring 36 passengers inside. In Qingshui, Taichung, an 18-year-old female was strangled to death by a falling coaxial cable of cable television when riding a motorcycle. In Wuqi, Taichung, an 82-year-old male was killed by blown into a flooded rice paddy when riding a bike.[15]

Maokong Gondola

The heavy rains brought by Typhoon Jangmi caused a landslide on the mountain slope near the Maokong Gondola Tower No. 16 on September 28. Considering local residents’ worries, On October 1, the Taipei City Government announced that the Maokong Gondola would temporarily suspend service and carry out further assessment; based on the suggestions made by construction, environment protection, and geological associations, it was decided that Tower No. 16 should be moved.[3]

The New Construction Office of Taipei City Government completed the work of moving T16 tower base and re-hanging cable on January 31, 2010. After examination of operational simulation by TRTC, the system met the requirements by the inspection committee on March 4, 2010. The Maokong Gondola eventually resumed normal operations on March 30, 2010.[3]

Japan

Typhoon Jangmi brought strong winds and heavy rainfall to Okinawa, peaking at 162 in (4,100 mm) to the islands on September 27–29.[16] Ishigaki Island sustained the most severe damage after a dike collapsed, flooding the surrounding areas.[17] Much of the prefecture was left without power as winds gusted to 110 km/h (70 mph).[18] Throughout the prefecture, four people were killed and six others were injured, two of whom sustained severe injuries.[17][19][20] Damage from the storm amounted to 65.2 million yen (US$746,670).[17] By October 1, the remnants of Jangmi brought heavy rains and strong winds to Kyūshū. The highest rainfall total was measured in Satsumakashiwabaru, in the Kagoshima Prefecture, at 380 mm (15 in).[16] In the prefecture, these rains triggered 42 landslides and flooded seven homes, three of which were left with severe damage. A total of 334 hectares of farmland was damaged by Jangmi, leaving 15.4 million yen (US$176,360) in losses.[21] In Miyazaki Prefecture, one person was injured and three homes were damaged after a hillside collapsed.[22]

See also

References

  1. ^ "Typhoon List". Japan Meteorological Agency. Retrieved June 10, 2013.
  2. ^ a b c "薔蜜(JANGMI)". 中央氣象局颱風警報發布概況表. Central Weather Bureau. Archived from the original on December 22, 2012. Retrieved June 7, 2013.
  3. ^ a b c "Chronicles of Maokong Gondola". Taipei Rapid Transit Corporation. January 2, 2013. Retrieved June 10, 2013.
  4. ^ 気象災害報告リスト. Typhoon 200815 (Jangmi) (in Japanese). Digital Typhoon. Retrieved June 10, 2013.
  5. ^ "Advisories on September 22, 2008" (TXT). Mtarchive Data Server. Iowa State University of Science and Technology.
  6. ^ "Advisories on September 23, 2008" (TXT). Mtarchive Data Server. Iowa State University of Science and Technology.
  7. ^ "Advisories on September 24, 2008" (TXT). Mtarchive Data Server. Iowa State University of Science and Technology.
  8. ^ "Severe Weather Bulletin Number ONE". Tropical Cyclone Alert: Tropical Storm "Opel" (Jangmi). PAGASA. Archived from the original on May 7, 2008. Retrieved June 6, 2013.
  9. ^ "Advisories on September 25, 2008" (TXT). Mtarchive Data Server. Iowa State University of Science and Technology.
  10. ^ "Advisories on September 26, 2008" (TXT). Mtarchive Data Server. Iowa State University of Science and Technology.
  11. ^ "Advisories on September 27, 2008" (TXT). Mtarchive Data Server. Iowa State University of Science and Technology.
  12. ^ "Advisories on September 28, 2008" (TXT). Mtarchive Data Server. Iowa State University of Science and Technology.
  13. ^ "Advisories on September 29, 2008" (TXT). Mtarchive Data Server. Iowa State University of Science and Technology.
  14. ^ "Advisories on September 30, 2008" (TXT). Mtarchive Data Server. Iowa State University of Science and Technology.
  15. ^ a b 災害應變處置報告 第6報 (PDF) (in Chinese). Central Emergency Operation center. September 29, 2008. Retrieved June 10, 2013.
  16. ^ a b "降水量サマリー". Typhoon 200815 (Jangmi). Digital Typhoon. Retrieved June 10, 2013.
  17. ^ a b c 気象災害報告 (2008-918-08) (in Japanese). National Institute of Informatics. Retrieved June 10, 2013.
  18. ^ "風速サマリービュー Typhoon 200815 (Jangmi)". National Institute of Informatics. Retrieved June 10, 2013.
  19. ^ 気象災害報告 (2008-927-08) (in Japanese). National Institute of Informatics. Retrieved June 10, 2013.
  20. ^ 気象災害報告 (2008-936-09) (in Japanese). National Institute of Informatics. Retrieved June 10, 2013.
  21. ^ 気象災害報告 (2008-827-21) (in Japanese). National Institute of Informatics. Retrieved June 10, 2013.
  22. ^ 気象災害報告 (2008-830-03) (in Japanese). National Institute of Informatics. Retrieved June 10, 2013.
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