Typhoon Lan
Typhoon Lan at peak intensity on August 11
Meteorological history
FormedAugust 5, 2023
ExtratropicalAugust 17, 2023
DissipatedAugust 18, 2023
Very strong typhoon
10-minute sustained (JMA)
Highest winds165 km/h (105 mph)
Lowest pressure940 hPa (mbar); 27.76 inHg
Category 4-equivalent typhoon
1-minute sustained (SSHWS/JTWC)
Highest winds215 km/h (130 mph)
Lowest pressure936 hPa (mbar); 27.64 inHg
Overall effects
Fatalities1
Injuries64
DamageUnknown
Areas affectedBonin Islands, Japan
IBTrACS
Part of the 2023 Pacific typhoon season

Typhoon Lan was a powerful tropical cyclone that struck central Japan in mid-August 2023. The seventh named storm and fifth typhoon of the 2023 Pacific typhoon season, Lan originated from an area of low pressure several hundred kilometers east of Iwo Jima. It initially tracked north-northwestward, gradually intensifying into a tropical storm and later to typhoon status, reaching its peak as a Category 4-equivalent typhoon with sustained winds of 215 km/h (130 mph) and a central pressure of 940 hPa (27.76 inHg). Lan then quickly weakened the following day due to the effects of inner ring of cloud tops and well-defined eyewall. Lan re-strengthened again to 155 km/h (100 mph), Lan made landfall near Cape Shionomisaki in Japan. Once inland, Lan rapidly weakened and degenerated into a tropical storm over the region's rough terrain. Lan emerged back over the southern Sea of Japan, before declared it an extratropical low on August 17. The low moved east-northeast and was last noted on the next day.

Lan caused widespread damage. In addition to causing landslides and flooding, the storm also uprooted trees and damaged electrical lines. At least 100,000 homes are without power, and more than 237,000 individuals have been forced from their homes. The Japan Meteorological Agency (JMA) issued purple heavy rain—the second highest level on a four-tier scale—and landslide warnings for parts of Kyoto Prefecture in Kansai region and Iwate Prefecture in Tōhoku region as of late August 14. One person has been reported dead and 64 are reported to have remained injured following the typhoon.

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

The origins of Typhoon Lan can be traced back to August 5, when the Japan Meteorological Agency (JMA) reported that a low-pressure area had formed east-northeast of Iwo Jima. Deep convection shifted towards the southeastern semicircle of the circulation, while the still-poorly defined center.[1][2] Environmental conditions were assessed as being marginally conducive for tropical cyclogenesis, with warm sea surface temperatures (SST) near 29–30 °C (84–86 °F) and low vertical wind shear, and good equatorward outflow.[3] At the same time, the JMA upgraded it to a tropical depression, before the Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert on the system.[4][5] The agency followed suit and designated the system 07W.[6] The same day, the agency upgraded to a tropical storm,[7] with the JMA assigning the name Lan for the system.[8] Satellite imagery depicting a convective banding feature with some deep convection over the northern and eastern semicircle.[9]

Typhoon Lan (left) and Hurricane Dora (right) on August 11

A banding eye began to appear on satellite imagery; the deep convection had started to consolidate and wrap around the low-level circulation center.[10] Lan continued to strengthen as it turned more westward under the influence of the SST and weak vertical wind shear, the JMA upgraded Lan to a severe tropical storm at 06:00 UTC on August 9 as its maximum sustained winds increased to 95 km/h (60 mph).[11] Organization began to steadily increase within the developing eyewall, but the JTWC reported that it did not intensify over the past twelve hours.[12] Lan began to intensify more quickly, reaching typhoon status.[13][14] Lan consolidated and developed a small, defined circulation with satellite imagery revealed a 30 nautical miles (56 km; 35 mi) ragged eye.[15] Lan developed a clear eye and continued strengthening on satellite imagery, surrounded by a warming eye of 10–17 °C (50–63 °F).[16]

The JTWC upgraded it to Category 4-equivalent typhoon on August 11 after Dvorak estimates indicated winds of 215 km/h (130 mph).[17] The JMA also assessed Lan to have winds of 165 km/h (105 mph), and a minimum pressure of 940 hPa (27.76 inHg).[18] The typhoon sustained a symmetric ring around deep convection.[19] Shortly after that however, Lan's slow motion began to upwell colder waters below the storm and the typhoon began to weaken.[20] Further degradation continued through August 12 with the cloud tops warming and the eyewall detoriating.[21] Lan re-strengthened again to 155 km/h (100 mph) as it strengthened. The storm maintained its overall convective structure, but the waters beneath the cyclone cooled, prompting a quick weakening trend.[22][23] The JMA downgraded Lan to a severe tropical storm, with estimated winds of 110 km/h (70 mph).[24] Around 19:00 UTC on August 14, Lan made landfall near Cape Shionomisaki in Japan. Once inland, Lan rapidly weakened and degenerated into a tropical storm over the region's rough terrain.[25] Lan emerged back over the southern Sea of Japan.[26] as it had an exposed low-level circulation center with banding structure. Lan began to accelerate to the northeast while weakening, the JTWC discontinued warnings on the system.[27][28] The JMA issued its last advisory on Lan, and declared it an extratropical low on August 17.[29] Lan tracked east-northeast until it was last noted on the next day.[30]

Effects in Japan

Schedule of the Tohoku-Hokkaido Shinkansen which was suspended due to the typhoon.

Authorities in Japan issued a strong typhoon warning for much of the country.[31] The JMA issued purple heavy rain—the second highest level on a four-tier scale—and landslide warnings for parts of Kyoto Prefecture in Kansai region and Iwate Prefecture in Tōhoku region as of late August 14, as well as purple storm surge warnings for parts of Hyōgo and Wakayama prefectures in Kansai region. Tokai region was anticipated to receive up to 45 mm (1.8 in) of precipitation, while the Kansai and Shikoku was expected to receive up to 40 mm (1.6 in). Hundreds of thousands of people have been ordered to evacuate in Aichi, Kyoto, Mie, Nara, and Wakayama prefecture. In preparation for the storm, authorities are releasing water from dams across the Chūgoku, Kansai, and Tokai regions.[32] Red high wave warnings have been issued for the Izu Islands by the JMA.[33] Throughout Shikoku, Hiroshima, and Shiman prefectures to Nagano and Niigata prefectures, rain of 1–4 in (25–102 mm) is anticipated. Prefectures from Tottori to Fukui may experience amounts of 4–8 in (100–200 mm). [34] A level 3 evacuation was ordered for 26,000 senior residents of a town in Wakayama Prefecture on Tuesday morning due to concerns that heavy rains will cause landslides.[35]

Typhoon Lan passing over the Bonin Islands on August 14

Typhoon Lan caused widespread damage. In addition to causing landslides and flooding, the typhoon also uprooted trees and damaged electrical lines. More than 100,000 homes are without power, and more than 237,000 individuals have been forced from their homes. The Japanese government has dispatched rescue teams to assist with the cleanup. The government has dispatched food and water to the affected districts, and the military has been deployed to assist with rescue and relief efforts.[36] According to officials, more than 590 residences in Tottori City are now cut off as access roads have been damaged.[37]

The western prefecture of Wakayama has experienced strong gusts and torrential rainfall.[38] At least 50,000 households in western and central Japan lost electricity.[39] More than 800 flights were cancelled.[40] An amount of rain similar to three times the usual August rainfall was recorded in Tottori Prefecture in a single day, totaling 470 mm (19 in) in 24 hours.[41] In Okayama and Tottori prefectures, 500 mm (20 in) of rain dropped during a period of 24 hours, while 100 mm (3.9 in) of rain fell every hour in Kyoto, Nara, and Tottori prefectures.[42]

Representatives from several of Japanese prefectures announced that they would postpone commemorating the surrender of Japan in World War II. The Japanese High School Baseball Championship held in Hyōgo Prefecture was postponed in August 16.[43] An 80-year-old female who was stuck in Saji Town was taken to the hospital for emergency care due to cardiac arrest, but she perished, another 64 remain injured.[44][45] According to the Japan Airlines, 240 domestic flights have been canceled as a result of Typhoon Lan.[46] Lan prompted the closure of Ghibli Park, Universal Studios Japan, and Nintendo.[47] Retailers and logistics firms would cease operations in western and center regions in Japan.[48]

See also

References

  1. ↑ "WWJP27 RJTD 051200". Japan Meteorological Agency. Archived from the original on August 6, 2023. Retrieved August 5, 2023.
  2. ↑ Significant Tropical Weather Advisory for the Western and South Pacific Oceans, 02Z 6 August 2023 (Report). United States Joint Typhoon Warning Center. August 6, 2023. Archived from the original on December 21, 2017. Retrieved August 6, 2023. Alt URL
  3. ↑ Significant Tropical Weather Advisory for the Western and South Pacific Oceans, 06Z 6 August 2023 (Report). United States Joint Typhoon Warning Center. August 6, 2023. Archived from the original on December 21, 2017. Retrieved August 6, 2023. Alt URL
  4. ↑ "WWJP27 RJTD 051800". Japan Meteorological Agency. Archived from the original on August 6, 2023. Retrieved August 5, 2023.
  5. ↑ Tropical Cyclone Formation Alert (Invest 95W) (Report). United States Joint Typhoon Warning Center. August 7, 2023. Archived from the original on August 7, 2023. Retrieved August 7, 2023.
  6. ↑ Prognostic Reasoning for Tropical Depression 07W (Seven) Warning No. 1 (Report). United States Joint Typhoon Warning Center. August 7, 2023. Archived from the original on August 8, 2023. Retrieved August 7, 2023.
  7. ↑ Prognostic Reasoning for Tropical Storm 07W (Seven) Warning No. 3 (Report). United States Joint Typhoon Warning Center. August 8, 2023. Archived from the original on August 8, 2023. Retrieved August 8, 2023.
  8. ↑ "RSMC Tropical Cyclone Prognostic Reasoning No. 5 for TS 2307 Lan (2307)". Japan Meteorological Agency. Archived from the original on August 8, 2023. Retrieved August 8, 2023.
  9. ↑ Prognostic Reasoning for Tropical Storm 07W (Lan) Warning No. 4 (Report). United States Joint Typhoon Warning Center. August 8, 2023. Archived from the original on August 8, 2023. Retrieved August 8, 2023.
  10. ↑ Prognostic Reasoning for Tropical Storm 07W (Lan) Warning No. 5 (Report). United States Joint Typhoon Warning Center. August 8, 2023. Archived from the original on August 9, 2023. Retrieved August 8, 2023.
  11. ↑ "RSMC Tropical Cyclone Prognostic Reasoning No. 10 for STS 2307 Lan (2307)". Japan Meteorological Agency. Archived from the original on August 9, 2023. Retrieved August 9, 2023.
  12. ↑ Prognostic Reasoning for Tropical Storm 07W (Lan) Warning No. 9 (Report). United States Joint Typhoon Warning Center. August 9, 2023. Archived from the original on August 10, 2023. Retrieved August 9, 2023.
  13. ↑ Prognostic Reasoning for Typhoon 07W (Lan) Warning No. 10 (Report). United States Joint Typhoon Warning Center. August 10, 2023. Archived from the original on August 10, 2023. Retrieved August 10, 2023.
  14. ↑ "RSMC Tropical Cyclone Prognostic Reasoning No. 14 for TY 2307 Lan (2307)". Japan Meteorological Agency. Archived from the original on August 10, 2023. Retrieved August 10, 2023.
  15. ↑ Prognostic Reasoning for Typhoon 07W (Lan) Warning No. 11 (Report). United States Joint Typhoon Warning Center. August 10, 2023. Archived from the original on August 10, 2023. Retrieved August 10, 2023.
  16. ↑ Prognostic Reasoning for Typhoon 07W (Lan) Warning No. 12 (Report). United States Joint Typhoon Warning Center. August 10, 2023. Archived from the original on August 10, 2023. Retrieved August 10, 2023.
  17. ↑ Prognostic Reasoning for Typhoon 07W (Lan) Warning No. 14 (Report). United States Joint Typhoon Warning Center. August 11, 2023. Archived from the original on August 11, 2023. Retrieved August 11, 2023.
  18. ↑ "RSMC Tropical Cyclone Prognostic Reasoning No. 17 for TY 2307 Lan (2307)". Japan Meteorological Agency. Archived from the original on August 11, 2023. Retrieved August 11, 2023.
  19. ↑ Prognostic Reasoning for Typhoon 07W (Lan) Warning No. 15 (Report). United States Joint Typhoon Warning Center. August 11, 2023. Archived from the original on August 11, 2023. Retrieved August 11, 2023.
  20. ↑ Prognostic Reasoning for Typhoon 07W (Lan) Warning No. 17 (Report). United States Joint Typhoon Warning Center. August 11, 2023. Archived from the original on August 12, 2023. Retrieved August 11, 2023.
  21. ↑ Prognostic Reasoning for Typhoon 07W (Lan) Warning No. 18 (Report). United States Joint Typhoon Warning Center. August 12, 2023. Archived from the original on August 12, 2023. Retrieved August 12, 2023.
  22. ↑ Prognostic Reasoning for Typhoon 07W (Lan) Warning No. 19 (Report). United States Joint Typhoon Warning Center. August 12, 2023. Archived from the original on August 12, 2023. Retrieved August 12, 2023.
  23. ↑ Prognostic Reasoning for Typhoon 07W (Lan) Warning No. 21 (Report). United States Joint Typhoon Warning Center. August 12, 2023. Archived from the original on August 13, 2023. Retrieved August 12, 2023.
  24. ↑ "WTPQ50 RJTD 141800". Japan Meteorological Agency. Archived from the original on August 15, 2023. Retrieved August 14, 2023.
  25. ↑ Prognostic Reasoning for Tropical Storm 07W (Lan) Warning No. 30 (Report). United States Joint Typhoon Warning Center. August 15, 2023. Archived from the original on August 15, 2023. Retrieved August 15, 2023.
  26. ↑ Prognostic Reasoning for Tropical Storm 07W (Lan) Warning No. 33 (Report). United States Joint Typhoon Warning Center. August 15, 2023. Archived from the original on August 16, 2023. Retrieved August 15, 2023.
  27. ↑ Prognostic Reasoning for Tropical Storm 07W (Lan) Warning No. 34 (Report). United States Joint Typhoon Warning Center. August 16, 2023. Archived from the original on August 16, 2023. Retrieved August 16, 2023.
  28. ↑ Tropical Storm 07W (Lan) Warning No. 38 (Report). United States Joint Typhoon Warning Center. August 17, 2023. Archived from the original on August 17, 2023. Retrieved August 17, 2023.
  29. ↑ "WTPQ50 RJTD 170600". Japan Meteorological Agency. Archived from the original on August 17, 2023. Retrieved August 17, 2023.
  30. ↑ "WWJP27 RJTD 181200". Japan Meteorological Agency. Archived from the original on August 19, 2023. Retrieved August 17, 2023.
  31. ↑ "Typhoon Lan set to crash Japan holiday week". TODAY. Archived from the original on August 25, 2023. Retrieved August 25, 2023.
  32. ↑ "Japan: Typhoon Lan tracking north-northwestward toward Kansai region as of late Aug. 14 /update 3". Japan: Typhoon Lan tracking north-northwestward toward Kansai region as of late Aug. 14 /update 3 | Crisis24. Archived from the original on August 25, 2023. Retrieved August 25, 2023.
  33. ↑ "Japan: Typhoon Lan tracking northwestward toward Kinki Region as of early Aug. 13 /update 1". Japan: Typhoon Lan tracking northwestward toward Kinki Region as of early Aug. 13 /update 1 | Crisis24. Archived from the original on August 25, 2023. Retrieved August 25, 2023.
  34. ↑ LoBiondo, Nicole (August 15, 2023). "Lan moves into the southwest Sea of Japan after spreading intense rainfall". AccuWeather. Archived from the original on August 25, 2023. Retrieved August 25, 2023.
  35. ↑ "Typhoon Lan paralyses planes and trains while crossing Japan". The Star. Archived from the original on August 25, 2023. Retrieved August 25, 2023.
  36. ↑ Arora, Sumit (August 17, 2023). "Typhoon Lan Hits Japan, Causing Flooding and Power Outages". adda247. Archived from the original on August 25, 2023. Retrieved August 25, 2023.
  37. ↑ "Tropical Storm Lan leaves trail of destruction in central, western Japan | NHK WORLD-JAPAN News". NHK WORLD. Archived from the original on August 25, 2023. Retrieved August 25, 2023.
  38. ↑ "Severe tropical storm Lan makes landfall in western Japan | NHK WORLD-JAPAN News". NHK WORLD. Archived from the original on August 25, 2023. Retrieved August 25, 2023.
  39. ↑ "Severe tropical storm Lan causes power outages in western, central Japan | NHK WORLD-JAPAN News". NHK WORLD. Archived from the original on August 25, 2023. Retrieved August 25, 2023.
  40. ↑ "Typhoon Lan makes landfall in western Japan, threatens damage". INQUIRER.net. August 15, 2023. Archived from the original on August 25, 2023. Retrieved August 25, 2023.
  41. ↑ TIMES編集部, ABEMA (August 15, 2023). "鳥取市 佐治川にかかる橋の一部が崩落 平年8月の約3倍にあたる雨量を1日で観測 | 国内 | ABEMA TIMES | アベマタイムズ". ABEMA TIMES (in Japanese). Archived from the original on August 16, 2023. Retrieved August 25, 2023.
  42. ↑ "Typhoon moving northward after causing havoc in west Japan | The Asahi Shimbun: Breaking News, Japan News and Analysis". The Asahi Shimbun. Archived from the original on August 22, 2023. Retrieved August 25, 2023.
  43. ↑ "蘭恩襲日｜關西增至30人受傷 鳥取市大壩洩洪過千人疏散｜國際｜商業電台 881903". 商業電台 881903 (in Traditional Chinese). August 15, 2023. Archived from the original on August 26, 2023. Retrieved August 25, 2023.
  44. ↑ "蘭恩襲日至少1死逾50傷 鳥取1800人受困新幹線停駛". 星島頭條 (in Chinese (Hong Kong)). August 16, 2023. Archived from the original on August 24, 2023. Retrieved August 25, 2023.
  45. ↑ S.A, Telewizja Polska. "Typhoon Lan leaves 60 people injured in Japan". tvpworld.com (in Polish). Archived from the original on August 25, 2023. Retrieved August 25, 2023.
  46. ↑ "蘭恩颱風恐登陸 日本新幹線將停駛區間車". 華視新聞網 (in Chinese). August 13, 2023. Archived from the original on August 13, 2023. Retrieved August 25, 2023.
  47. ↑ Nowacky, John (August 14, 2023). "Parks and Stores Temporarily Closed Due to Typhoon Lan". Game Is Hard. Archived from the original on August 25, 2023. Retrieved August 25, 2023.
  48. ↑ "Japan Logistics Firms, Retailers to Halt Services over Typhoon". nippon.com. August 14, 2023. Archived from the original on August 25, 2023. Retrieved August 25, 2023.
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