Timeline of the 2011 Pacific typhoon season

Map showing all storm paths in the 2011 Pacific typhoon season

This timeline documents all of the events of the 2011 Pacific typhoon season, the period that tropical cyclones formed in the Western Pacific Ocean in 2011. Most of the tropical cyclones formed between May and November 2011. The scope of this article is limited to the Pacific Ocean, north of the equator between 100°E and the International Date Line. Tropical storms that form in the entire Western Pacific basin are assigned a name by the Japan Meteorological Agency (JMA). Tropical depressions that form in this basin are given a number with a "W" suffix by the United States' Joint Typhoon Warning Center (JTWC). In addition, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) assigns names to tropical cyclones (including tropical depressions) that enter or form in the Philippine area of responsibility. These names, however, are not in common use outside of the Philippines.

During the season, a total of 40 systems were designated as Tropical Depressions by either the Japan Meteorological Agency (JMA), the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA), the Joint Typhoon Warning Center (JTWC), or other national meteorological and hydrological services such as the China Meteorological Administration and the Hong Kong Observatory. Because the JMA runs the Regional Specialized Meteorological Centre for the Western Pacific, it assigns names to Tropical Depressions should they intensify into a tropical storm. PAGASA also assigns local names to tropical depressions which form within their area of responsibility; however, these names are not in common use outside of PAGASA’s area of responsibility.

For the PAGASA, 19 systems formed or entered in area of responsibility during 2011, which 10 of them directly made landfall over the Philippines. No tropical cyclones formed during January to March. The season started on April 1 with the formation of Tropical Depression 01W.

Timeline of storms

Tropical Storm Washi (2011) Typhoon Nalgae (2011) Typhoon Nesat (2011) Typhoon Roke (2011) Tropical Storm Talas (2011) Typhoon Nanmadol (2011) Typhoon Muifa (2011) Tropical Storm Nock-ten (2011) Typhoon Ma-on (2011) Tropical Storm Aere (2011)

January

January 1

February

There were no tropical updates during the whole February.

March

There were no tropical updates during March 1 - March 29.

March 30
March 31

April

April 1
April 2
April 3
  • 02W entered the Philippine area of responsibility receiving the name Amang.
April 4
April 6

May

May 5
Typhoon Songda weakening as a Category 3 early on May 27
May 6
May 7
May 8
May 12
May 13
May 19
May 20
May 21
May 23
May 24
May 25
May 29
May 31

June

June 2
Tropical Storm Meari with its rainbands from the ITCZ
June 8
June 10
June 11
June 14
June 15
June 16
June 17
June 20
June 21
June 22
June 23

Tropical Storm Haima makes landfall in Zhanjiang, Guandong, China.

  • Tropical Storm Meari intensifies as it enters dry air and deep convection and became a Severe Tropical Storm the next day and enters Okinawa, Japan late on June 23.
June 25
  • Tropical Storm Haima slowly dissipates over land as it moves southwest.
June 27
  • Severe Tropical Storm Meari dissipates and made landfall in Korea killing 9.[22]

July

July 7
July 9
July 11
July 12
July 13
July 14
July 15
July 17
  • Typhoon Ma-on enters the Philippine area of responsibility in a short matter of time as it is been named Ineng.
July 20
  • Typhoon Ma-on steadily weakens as it made landfall in Wakayama.
July 23
  • Tropical Storm Ma-on weakens to a tropical depression and dissipates the next day.
  • Tropical Depression Juaning forms east of the Philippines as deep convection wrapped up Juaning and was designated 10W.
July 25
  • Juaning was upgraded to Tropical Storm Nock-ten as it struck land in the Philippines.
July 27
  • Nock-ten creates an unbalanced eye in a short time as it became a Severe Tropical Storm by the JMA but the JTWC upgraded it to a typhoon.
  • Tropical Depression 11W forms west of Guam.
July 28
  • 11W intensifies to Tropical Storm Muifa as it intensified and enters the PAR given the name Kabayan.
  • Tropical Storm Nock-ten enters the South China Sea on July 28 and intensifies again to a strong Tropical Storm.
July 30
  • Severe Tropical Storm Muifa rapidly becomes a minimal typhoon as it heads straight north affecting the Philippines by the southwest monsoon.
  • Nock-ten impacts the south China cost as it dissipates the next day.
  • A disturbance formed northwest of Manila from the southwest monsoon, which is been enhanced by Typhoon Muifa.
July 31
  • Deep convection occurred as the disturbance became a tropical depression naming it Lando By the PAGASA.
  • Typhoon Muifa started creating an eyewall as it began explosive intensification late on July 31.

August

August 1
August 2
Super Typhoon Nanmadol on early on August 26
August 4
August 7
August 8
August 10
August 15
August 20
August 22
August 23
August 25
  • Nanmadol rapidly becomes a typhoon as it approaches landfall late on August 25.
August 27
August 30
  • Typhoon Nanmadol dissipates over China and Taiwan as it made its third landfall.
  • Talas slowly weakens as it nearly enters cool waters.

September

September 1
September 3
September 4
September 6
September 7
September 8
September 9
  • Tropical Storm Kulap's circulation became exposed as it moves closer to southern and southwestern parts of Japan.[62]
  • The low pressure strengthened to Tropical Disturbance.
September 11
  • Tropical Depression Kulap dissipates as it was absorbed by a weather front on mid-September 11.[63]
  • The Tropical Depression was designated 18W as deep convection wraps 18W. It also entered the Philippines area of responsibility naming it Onyok.
September 12
Typhoon Roke very shortly after its rapid deepening
September 13
September 14
  • 19W was designated by the JTWC as the tropical depression formed even further.
  • Roke started strengthening as it moved west.
September 15
  • Tropical Depression 19W turned into Tropical Storm Sonca as it moved west in a fast pace movement.
September 17
  • On September 17, Roke was intensified as a severe tropical storm as it developed a small deep convective eye.
  • Sonca was also upgraded to a severe tropical storm.
September 18
  • Severe Tropical Storm Sonca was upgraded to a Category 1 typhoon. It was then intensified to a Category 2 typhoon the next day.
  • Roke became a typhoon as it made a small loop as it re-enters the Philippines' area of responsibility and moved northeastwards.
September 20
  • Typhoon Roke underwent rapid deepening and became a Category 4 typhoon.
  • Sonca rapidly becomes extratropical and dissipates later that day.
September 22
  • Typhoon Roke becomes extratropical as its remnants dissipates the next day.
  • A disturbance forms southwest of Guam.
September 23
  • It was upgraded to Tropical Depression 20W.
  • An area of convection intensifies to a depression in the South China Sea.
September 24
September 25
Track of Haitang on late-September
September 26
September 27
September 28
September 29
September 30

October

October 1
October 2
October 3
October 5
October 7
October 9
October 10
October 11
October 14

November

November 5
November 7
November 8
November 9

There were no tropical updates during November 10–31.

December

December 2
December 3
December 5
December 9
December 10
December 12
Estimated Rainfall over the Philippines from Tropical Storm Washi
December 13
December 14
December 15
December 16
December 18
December 19
December 30
December 31

See also

References

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External links

Preceded by
2010
Pacific typhoon season timelines
2011
Succeeded by
2012
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