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Typhoon Dujuan (2015)

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This article is about the 2015 typhoon. For other storms of the same name, see Typhoon Dujuan.
Dujuan (Jenny)
Current storm status
Typhoon  (JMA)
Current storm status
Category 4 typhoon (1-min mean)
Satellite image
Forecast map
As of:10:00 UTC, September 28
Location:24°06′N 121°36′E / 24.1°N 121.6°E / 24.1; 121.6 (Dujuan (Jenny))
101 nmi (187 km; 116 mi) SE of Taipei, Taiwan
About 50 km (31 mi) NNE of Hualien City, Taiwan
Sustained winds:165 km/h (105 mph) (10-min mean)
220 km/h (140 mph) (1-min mean)
gusting to 240 km/h (150 mph)
Pressure:940 hPa (27.76 inHg)
Movement:W at 16 kn (30 km/h; 18 mph)
See more detailed information.

Typhoon Dujuan, known in the Philippines as Typhoon Jenny, is currently a powerful tropical cyclone affecting the Yaeyama Islands and located inside Taiwan. The twenty-first named storm and the thirteenth typhoon of the annual typhoon season, Dujuan is the second most intense tropical cyclone of the Northwest Pacific Ocean in 2015 in terms of ten-minute maximum sustained winds, tied with Noul. The typhoon is forecasted to make landfall over Fujian, China on September 29.

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 origin of Typhoon Dujuan can be traced back to a tropical disturbance that formed over the Maloelap Atoll late on September 14.[1] Convection remained very fragmented until September 20, when the Japan Meteorological Agency (JMA) upgraded the low-pressure area to a tropical depression east-northeast of Guam early on that day.[2][3] Moreover, the Joint Typhoon Warning Center (JTWC) started to issue a Tropical Cyclone Formation Alert at the same time and indicated a monsoon depression, although the low-level circulation center (LLCC) was exposed and located east of the deep convective banding.[4] In the afternoon on September 21, the JMA began to issue tropical cyclone warnings to the system, shortly before the JTWC also upgraded it to a tropical depression and designated it as 21W, based on the convective structure and a RapidSCAT image.[5][6] On September 22, although the structure remained asymmetric with a fully exposed LLCC under easterly moderate vertical wind shear, the system still intensified into a tropical storm late on the same day and received the name Dujuan from the JMA.[7][8]

Many meteorological agencies initially forecasted a recurving track south of Japan to Dujuan, but those agencies changed it to a west-northwest track pointing to China after 24 hours.[9] Dujuan developed smaller vortices rotating around a larger circulation centroid with deep convection along the western periphery on September 23;[10] however, right after the storm entered the Philippine Area of Responsibility and was named Jenny by PAGASA, there has been only one partially exposed LLCC within the consolidating structure in the afternoon, leading more model guidances to show a stair-step track vice a recurve scenario.[11][12] When moving and organizing slowly on September 24, Dujuan was upgraded to a severe tropical storm early on that day, with an apparent eye revealed by a microwave imagery.[13][14] Based on a ragged eye under decreasing vertical wind shear, both of the JTWC and then the JMA upgraded Dujuan to a typhoon early on September 25, as the system started to track northwestward along the southwestern periphery of a deep-layered subtropical ridge.[15][16][17]

Good divergent outflow as well as low vertical wind shear allowed Dujuan to intensify stably on September 26, yet dry air and subsidence were impacting the system at the same time, making the western eyewall break down.[18] Dujuan started to track west-northwestward and improve its overall structure significantly late on the same day, with a more symmetric core surrounding a large eye thanks to decreasing dry air.[19] Due to sea surface temperature at 29ºC and improved radial outflow enhanced by a microscale anticyclone aloft, the JTWC indicated that the typhoon with an enlarged 80 km (50 miles) embedded in the highly deep and symmetric core had one-minute maximum sustained winds at 230 km/h (145 mph) early on September 27, equivalent to Category 4 of the Saffir–Simpson hurricane wind scale.[20] Right after record-breaking winds were observed in Yonaguni around 07:00 UTC on September 28, the JMA raised Dujuan’s ten-minute maximum sustained winds to 205 km/h (125 mph) immediately.[21]

Impact

Japan

Taiwan

Bon Jovi’s concert at the Taipei World Trade Center Nangang Exhibition Hall on September 28 was canceled due to Typhoon Dujuan, as the Taipei City government announced school and office closures for that day.[22]

See also

References

  1. ^ "Index of /tcdat/tc15/WPAC/21W.DUJUAN/ir/geo/1km". US Naval Research Laboratory, Marine Meteorology. Retrieved September 27, 2015.
  2. ^ "Significant Tropical Weather Advisory for the Western and South Pacific Oceans 170600Z-180600Z Sep 2015". Joint Typhoon Warning Center. Archived from the original on September 27, 2015. Retrieved September 27, 2015.
  3. ^ "Marine Weather Warning for GMDSS Metarea XI 2015-09-20T00:00:00Z". WIS Portal – GISC Tokyo. Japan Meteorological Agency. Retrieved September 27, 2015.
  4. ^ "Tropical Cyclone Formation Alert". Joint Typhoon Warning Center. Archived from the original on September 27, 2015. Retrieved September 27, 2015.
  5. ^ "RSMC Tropical Cyclone Advisory 211200". Japan Meteorological Agency. Archived from the original on September 21, 2015. Retrieved September 27, 2015.
  6. ^ "Prognostic Reasoning for Tropical Depression 21W (Twentyone) Warning Nr 01". Joint Typhoon Warning Center. Archived from the original on September 21, 2015. Retrieved September 27, 2015.
  7. ^ "Prognostic Reasoning for Tropical Depression 21W (Dujuan) Warning Nr 05". Joint Typhoon Warning Center. Archived from the original on September 22, 2015. Retrieved September 27, 2015.
  8. ^ "RSMC Tropical Cyclone Advisory 221800". Japan Meteorological Agency. Archived from the original on September 22, 2015. Retrieved September 27, 2015.
  9. ^ "Log of DUJUAN (2015) Multi-Agency TC Forecast". Typhoon2000.com. Retrieved September 27, 2015.
  10. ^ "Prognostic Reasoning for Tropical Storm 21W (Dujuan) Warning Nr 07". Joint Typhoon Warning Center. Archived from the original on September 23, 2015. Retrieved September 28, 2015.
  11. ^ "Tropical Cyclone Alert: Tropical Storm "Jenny" Severe Weather Bulletin #1". PAGASA. Archived from the original on September 28, 2015. Retrieved September 28, 2015.
  12. ^ "Prognostic Reasoning for Tropical Storm 21W (Dujuan) Warning Nr 09". Joint Typhoon Warning Center. Archived from the original on September 23, 2015. Retrieved September 28, 2015.
  13. ^ "RSMC Tropical Cyclone Advisory 240600". Japan Meteorological Agency. Archived from the original on September 24, 2015. Retrieved September 28, 2015.
  14. ^ "Prognostic Reasoning for Tropical Storm 21W (Dujuan) Warning Nr 12". Joint Typhoon Warning Center. Archived from the original on September 24, 2015. Retrieved September 28, 2015.
  15. ^ "Prognostic Reasoning for Typhoon 21W (Dujuan) Warning Nr 14". Joint Typhoon Warning Center. Archived from the original on September 25, 2015. Retrieved September 28, 2015.
  16. ^ "RSMC Tropical Cyclone Advisory 250600". Japan Meteorological Agency. Archived from the original on September 25, 2015. Retrieved September 28, 2015.
  17. ^ "Prognostic Reasoning for Typhoon 21W (Dujuan) Warning Nr 15". Joint Typhoon Warning Center. Archived from the original on September 25, 2015. Retrieved September 28, 2015.
  18. ^ "Prognostic Reasoning for Typhoon 21W (Dujuan) Warning Nr 19". Joint Typhoon Warning Center. Archived from the original on September 26, 2015. Retrieved September 28, 2015.
  19. ^ "Prognostic Reasoning for Typhoon 21W (Dujuan) Warning Nr 21". Joint Typhoon Warning Center. Archived from the original on September 26, 2015. Retrieved September 28, 2015.
  20. ^ "Prognostic Reasoning for Typhoon 21W (Dujuan) Warning Nr 23". Joint Typhoon Warning Center. Archived from the original on September 27, 2015. Retrieved September 28, 2015.
  21. ^ "TY 1521 (DUJUAN) Tropical Cyclone Information Issued at 07:40 UTC, 28 September 2015". Japan Meteorological Agency. Archived from the original on September 28, 2015. Retrieved September 28, 2015.
  22. ^ Chen, Christie (September 27, 2015). "Bon Jovi's Taipei concert on Monday canceled due to typhoon". Focus Taiwan. Central News Agency. Retrieved September 28, 2015.
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