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Typhoon Jongdari

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Jongdari
Current storm status
Typhoon  (JMA)
Current storm status
Category 1 typhoon (1-min mean)
Satellite image
Forecast map
As of:12:00 UTC, July 28
Location:34°06′N 138°12′E / 34.1°N 138.2°E / 34.1; 138.2 (Jongdari) ± 50 nm
About 60 km (37 mi) S of Omaezaki, Japan
Sustained winds:130 km/h (80 mph) (10-min mean)
130 km/h (80 mph) (1-min mean)
gusting to 185 km/h (115 mph)
Pressure:970 hPa (mbar; 28.64 inHg)
Movement:W at 19 kn (35 km/h; 22 mph)
See more detailed information.

Typhoon Jongdari is currently a strong tropical cyclone rapidly approaching the Tōkai region of Japan. Formed as the twelve named storm of the 2018 typhoon season near Okinotorishima on July 24, Jongdari gradually intensified and developed into the fourth typhoon of the year on July 26. Influenced by an upper-level low and a subtropical ridge, Jongdari initiated a rare counterclockwise recurve next day when it also reached peak intensity.

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 tropical disturbance formed southeast of Guam on July 19 and tracked westward steadily.[1] After issuing a Tropical Cyclone Formation Alert on July 21, the Joint Typhoon Warning Center (JTWC) upgraded the system to a tropical depression early on July 22, although the location of its low-level circulation center was not clear.[2] The Japan Meteorological Agency (JMA), however, kept reporting it as a low-pressure area until it was upgraded to a tropical depression late on July 23.[3] After the slow consolidation for several days, the system was upgraded to a tropical storm near Okinotorishima at around 18:00 on July 24 by agencies such as JMA and JTWC, with an international name Jongdari.[4][5] A microwave imagery revealed a low-level forming eyewall next day, indicating a consolidating system. After JMA upgraded Jongdari to a severe tropical storm at noon,[6] the system accelerated east-northeastward under the influence of a near-equatorial ridge to the south.[7]

On July 26, as Jongdari started to interact with an upper-level cold-core low to the north which significantly enhanced poleward outflow,[8] it intensified to a typhoon in the afternoon despite increasingly unfavorable vertical wind shear.[9] Over the warm sea surface temperatures between 29 to 30 °C near the Ogasawara Islands, JMA reported that Jongdari had reached the period of peak intensity at around 00:00 UTC on July 27, with the central pressure at 965 hPa (28.50 inHg) and ten-minute maximum sustained winds at 140 km/h (85 mph).[10] Although JTWC indicated a peak intensity at 12:00 UTC with one-minute maximum sustained winds at 175 km/h (110 kph), the rugged eye of Jongdari kept periodically visible with an elongated structure due to the further interaction of that previously mentioned upper-level low which had moved to the northwest side of the typhoon. As the steering influence transitioned to a subtropical ridge to the northeast, Jongdari tracked northeastward, northward, and then north-northwestward very rapidly.[11]

Jongdari began to be inundated by subsidence on July 28, as the Fujiwhara effect had made the upper-level low move to the west of the typhoon.[12] It also initiated a weakening trend while tracking northwestward and then westward very rapidly toward Japan at about 26 knots.

Impact

See also

Notes

References

  1. ^ "bwp152018.dat". Joint Typhoon Warning Center. Retrieved July 27, 2018.
  2. ^ "Prognostic Reasoning for Tropical Depression 15W (Fifteen) Warning Nr 01". July 22, 2018. Archived from the original on July 22, 2018. Retrieved July 27, 2018.
  3. ^ "WWJP25 RJTD 231800". Japan Meteorological Agency. July 23, 2018. Archived from the original on July 23, 2018. Retrieved July 27, 2018.
  4. ^ "RSMC Tropical Cyclone Advisory 241800". Japan Meteorological Agency. July 24, 2017. Archived from the original on July 24, 2017. Retrieved July 27, 2017.
  5. ^ "Prognostic Reasoning for Tropical Storm 15W (Jongdari) Warning Nr 12". July 24, 2018. Archived from the original on July 24, 2018. Retrieved July 27, 2018.
  6. ^ "RSMC Tropical Cyclone Advisory 251200". Japan Meteorological Agency. July 25, 2017. Archived from the original on July 25, 2017. Retrieved July 28, 2017.
  7. ^ "Prognostic Reasoning for Tropical Storm 15W (Jongdari) Warning Nr 15". July 25, 2018. Archived from the original on July 25, 2018. Retrieved July 28, 2018.
  8. ^ "Prognostic Reasoning for Tropical Storm 15W (Jongdari) Warning Nr 19". July 26, 2018. Archived from the original on July 26, 2018. Retrieved July 28, 2018.
  9. ^ "RSMC Tropical Cyclone Advisory 261200". Japan Meteorological Agency. July 26, 2017. Archived from the original on July 26, 2017. Retrieved July 28, 2017.
  10. ^ "RSMC Tropical Cyclone Advisory 270000". Japan Meteorological Agency. July 27, 2017. Archived from the original on July 27, 2017. Retrieved July 28, 2017.
  11. ^ "Prognostic Reasoning for Typhoon 15W (Jongdari) Warning Nr 23". July 27, 2018. Archived from the original on July 27, 2018. Retrieved July 28, 2018.
  12. ^ "Prognostic Reasoning for Typhoon 15W (Jongdari) Warning Nr 25". July 28, 2018. Archived from the original on July 28, 2018. Retrieved July 28, 2018.
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