Tropical cyclones in 2011

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Tropical cyclones in 2011
Year summary map
Year boundaries
First system	03
Formed	January 2, 2011
Last system	Benilde
Dissipated	January 4, 2012
Strongest system
Name	Songda
Lowest pressure	920 mbar/hPa; 27.17 inHg
Longest lasting system
Name	Philippe
Duration	14 days
Year statistics
Total systems	131
Named systems	71
Total fatalities	3,702 total
Total damage	$29.86 billion (2011 USD)
Related articles 2011 Atlantic hurricane season 2011 Pacific hurricane season 2011 Pacific typhoon season 2011 North Indian Ocean cyclone season 2010–11 South-West Indian Ocean cyclone season 2011–12 South-West Indian Ocean cyclone season 2010–11 Australian region cyclone season 2011–12 Australian region cyclone season 2010–11 South Pacific cyclone season 2011–12 South Pacific cyclone season
Other years 2009, 2010, 2011, 2012, 2013

Three Atlantic tropical cyclones simultaneously active on September 8. From left to right: Nate (left), Katia (middle), and Maria (right).

During 2011, tropical cyclones formed within seven different tropical cyclone basins, located within various parts of the Atlantic, Pacific and Indian Oceans. During the year, a total of 131 tropical cyclones had formed this year to date. 71 tropical cyclones had been named by either a Regional Specialized Meteorological Center (RSMC) or a Tropical Cyclone Warning Center (TCWC). Thirty-nine of these named systems eventually intensified into hurricane-equivalent tropical cyclones.

The most active basin in the year was the Western Pacific, which documented 21 named storms. North Atlantic basin documented 19 named storms, continuing the consecutive third-most active season trends from the previous year, due to the 2010–12 La Niña event. Conversely, the Eastern Pacific basin featured slightly more activity than the previous season, with 11 named storms. The least active basin in the year was the North Indian Ocean basin which documented only 2 named storms, the lowest since the 1993 season. Activity across the Southern Hemisphere were almost evenly spread, with the South-West Indian Ocean basin recording 10 tropical cyclones, the Australian region recording 17 tropical cyclones, and the South Pacific basin also recording 10 tropical cyclones, respectively. Three Category 5 tropical cyclones were formed in 2011.

The strongest tropical cyclone of the year was Typhoon Songda, with a minimum central pressure of 920 hPa (mbar). The costliest tropical cyclone of the year was Hurricane Irene, which caused $14.2 billion worth of damage. The deadliest tropical cyclone of the year was Severe Tropical Storm Washi, which killed 2,546 people.

Global atmospheric and hydrological conditions[]

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Summary[]

Systems[]

January[]

Cyclone Yasi

During January 2011, a total of 12 tropical cyclones, all of them, formed within the southern hemisphere. No tropical cyclone was observed in the northern hemisphere. Of the systems, 7 further intensified to become named. Out of the systems, Wilma was the most intense tropical cyclone, with a minimum barometric pressure of 935 mbar/hPa.

February[]

Cyclone Atu

10 systems formed and 5 named storms during February.

March[]

Cyclone Bune

March was a relatively inactive month in which 11 systems formed, and only 3 received names.

April[]

Subtropical Depression 09

Cyclone Errol

May[]

Typhoon Songda

May was a mostly inactive month in which only 4 tropical cyclones formed, in which 2 received names.

June[]

Hurricane Adrian

July[]

Hurricane Dora

August[]

Typhoon Nanmadol

Hurricane Katia

August was the most active month of 2011, with 18 systems forming in the month.

September[]

Typhoon Nalgae

Hurricane Hilary

September was a below-average month, with only 16 tropical cyclones forming in that month.

October[]

Hurricane Jova

November[]

Hurricane Kenneth

November was inactive with only 7 tropical cyclones forming, as well as Rolf, a system that formed in the Mediterranean sea.

December[]

Cyclone Benilde

Global effects[]

See also[]

• Tropical cyclones by year
• List of earthquakes in 2011
• Tornadoes of 2011

Notes[]

¹The "strength" of a tropical cyclone is measured by the minimum barometric pressure, not wind speed. Most meteorological organizations rate the intensity of a storm by this figure, so the lower the minimum pressure of the storm, the more intense or "stronger" it is considered to be.
² Only systems that formed either on or after January 1, 2011 are counted in the seasonal totals.
³ Only systems that formed either before or on December 31, 2011 are counted in the seasonal totals.
⁴ The wind speeds for this tropical cyclone/basin are based on the IMD Scale which uses 3-minute sustained winds.
⁵ The wind speeds for this tropical cyclone/basin are based on the Saffir Simpson Scale which uses 1-minute sustained winds.
⁶The wind speeds for this tropical cyclone are based on Météo-France which uses wind gusts.

References[]

External links[]

Regional Specialized Meteorological Centers

• US National Hurricane Center – North Atlantic, Eastern Pacific
• Central Pacific Hurricane Center – Central Pacific
• Japan Meteorological Agency – NW Pacific
• India Meteorological Department – Bay of Bengal and the Arabian Sea
• Météo-France – La Reunion – South Indian Ocean from 30°E to 90°E
• Fiji Meteorological Service – South Pacific west of 160°E, north of 25° S

Tropical Cyclone Warning Centers

• Meteorology, Climatology, and Geophysical Agency of Indonesia – South Indian Ocean from 90°E to 141°E, generally north of 10°S
• Australian Bureau of Meteorology (TCWC's Perth, Darwin & Brisbane) – South Indian Ocean & South Pacific Ocean from 90°E to 160°E, generally south of 10°S
• Papua New Guinea National Weather Service – South Pacific Ocean from 141°E to 160°E, generally north of 10°S
• Meteorological Service of New Zealand Limited – South Pacific west of 160°E, south of 25°S

 This article incorporates public domain material from websites or documents of the National Weather Service.