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2011 Pacific typhoon season

20112011 seasonMeari 2011
It was the fifteenth named storm, the tenth severe tropical storm, the sixth typhoon of the 2011 Pacific typhoon season and overall, the 27th tropical cyclone to be monitored by the Japan Meteorological Agency during the year.
Tropical Storm Talas and Typhoon Roke made landfall over in Japan and were the most destructive since 2009.

Tropical Storm Talas (2011)

TalasTropical Storm TalasTyphoon Talas
Typhoon Roke, known in the Philippines as Tropical Storm Onyok, was a powerful and persistent tropical cyclone that affected Japan, including some areas that had been damaged by another typhoon just a few weeks prior.
Typhoon Roke (2011)

Typhoon Lionrock (2016)

Typhoon LionrockLionrockTropical Storm Lionrock
Typhoon Lionrock (2016)
Typhoon Roke (2011)

Tropical cyclone

hurricanetropical stormhurricanes
Typhoon Roke, known in the Philippines as Tropical Storm Onyok, was a powerful and persistent tropical cyclone that affected Japan, including some areas that had been damaged by another typhoon just a few weeks prior.

Japan

🇯🇵JPNJapanese
Typhoon Roke, known in the Philippines as Tropical Storm Onyok, was a powerful and persistent tropical cyclone that affected Japan, including some areas that had been damaged by another typhoon just a few weeks prior. At that time, Roke was approximately 170 nmi east of Kadena Air Base, Japan with winds of over 60 kn. As a result, the JMA upgraded Roke to a severe tropical storm.

Typhoon

typhoonsWestern Pacificwestern Pacific basin
It was the fifteenth named storm, the tenth severe tropical storm, the sixth typhoon of the 2011 Pacific typhoon season and overall, the 27th tropical cyclone to be monitored by the Japan Meteorological Agency during the year.

Japan Meteorological Agency

JMAJapan Meteorological Agency (JMA)Meteorological Agency
It was the fifteenth named storm, the tenth severe tropical storm, the sixth typhoon of the 2011 Pacific typhoon season and overall, the 27th tropical cyclone to be monitored by the Japan Meteorological Agency during the year.

Hagåtña, Guam

HagåtñaAganaHagatna
On September 8, the Joint Typhoon Warning Center started to monitor a tropical disturbance that had developed about 935 km to the northeast of Hagåtña, Guam.

Joint Typhoon Warning Center

Joint Typhoon Warning Center (JTWC)JTWCNaval Pacific Meteorology and Oceanography Center
Over the next two days, the system gradually drifted west and intensified slightly, prompting the Joint Typhoon Warning Center (JTWC) to issue a Tropical Cyclone Formation Alert (TCFA) on it. Convection gradually consolidated the LLCC and the JTWC initiated advisories on the system on September 11, designating it with 18W.

Philippine Area of Responsibility

area of responsibility
The next day, the depression drifted into the Philippine Area of Responsibility (PAR) and the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) initiated advisories on the depression, naming it Onyok.

PAGASA

Philippine Atmospheric, Geophysical and Astronomical Services AdministrationPhilippine Weather BureauPhilippine Area of Responsibility
The next day, the depression drifted into the Philippine Area of Responsibility (PAR) and the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) initiated advisories on the depression, naming it Onyok.

Vortex

vorticesvortex linesvortexes
In an advisory, the JTWC reported that there were at least two more vortices associated with the system, that caused an abrupt, erratic movement.

Tropical upper tropospheric trough

tropical upper-tropospheric troughTUTTtropical upper tropospheric trough (TUTT)
On September 14, a Tropical upper tropospheric trough (TUTT) cell located approximately 05 degrees to the west of the system caused strong subsidence prompting the JTWC to downgrade Roke to a tropical depression.

Subsidence (atmosphere)

subsidencesubsidesatmospheric subsidence
On September 14, a Tropical upper tropospheric trough (TUTT) cell located approximately 05 degrees to the west of the system caused strong subsidence prompting the JTWC to downgrade Roke to a tropical depression.

Subtropical cyclone

subtropicalsubtropical stormsubtropical depression
Despite the upper low over the LLCC, Roke remained a warm-core tropical cyclone and the JTWC predicted that there were chances of Roke become a hybrid or a subtropical storm.

Kadena Air Base

Kadena ABKadena AirfieldKadena
At that time, Roke was approximately 170 nmi east of Kadena Air Base, Japan with winds of over 60 kn. As a result, the JMA upgraded Roke to a severe tropical storm.

Westerlies

westerlywesterly windsprevailing westerly winds
However, Roke soon started become elongated around the northeast quadrant as a response to the strong westerlies ahead of a mid-latitude trough.

Rapid intensification

rapid deepeningrapidly intensifiedrapidly intensify
Then, being located in an area of low vertical wind shear and abnormally high sea surface temperatures, Roke underwent rapid deepening and became a Category 1 typhoon on the SSHS with a maximum sustained windspeed of 70 kn (1-min sustained).

Bar (unit)

mbarbarmillibars
The JTWC later reported that Roke underwent Explosive intensification, a more extreme case of rapid deepening that involves a tropical cyclone deepening at a rate of at least 2.5 mbar per hour for a minimum of 12 hours.

Outflow (meteorology)

outflowinflowoutflow channel
Also, they added that Roke developed a 10 nmi eye and a good poleward outflow channel.

Hamamatsu

Hamamatsu CityHamamatsu, JapanHamamatsu, Shizuoka
On September 21, Typhoon Roke made landfall over Hamamatsu, Japan at about 5:00 UTC (14:00 JST).

Japan Standard Time

JSTUTC+9UTC+09:00
On September 21, Typhoon Roke made landfall over Hamamatsu, Japan at about 5:00 UTC (14:00 JST).

Yokosuka

Yokosuka, JapanOppamaUraga
Being located approximately 330 nmi southwest of Yokosuka, Kanagawa, the typhoon accelerated northeastward at approximately 16 kn with winds of over 100 kn (1-min sustained) being a Category 3 typhoon on the SSHS.