Timeline of the 2011 Pacific hurricane season

The 2011 Pacific hurricane season

2011 Pacific hurricane season

The 2011 Pacific hurricane season is an ongoing, annual cycle of tropical cyclone formation. The season officially started on May 15, 2011, for the eastern Pacific, and started on June 1, 2011, for the central Pacific, both of which ended on November 30, 2011. These dates conventionally...

officially started on May 15, 2011 in the eastern Pacific, designated as the area east of 140°W

Longitude

Longitude is a geographic coordinate that specifies the east-west position of a point on the Earth's surface. It is an angular measurement, usually expressed in degrees, minutes and seconds, and denoted by the Greek letter lambda ....

, and on June 1, 2011 in the central Pacific, which is between the International Date Line

International Date Line

The International Date Line is a generally north-south imaginary line on the surface of the Earth, passing through the middle of the Pacific Ocean, that designates the place where each calendar day begins...

and 140°W, and lasted until November 30, 2011. These dates typically limit the period of each year when most tropical cyclones form in the eastern Pacific basin

Pacific hurricane

A Pacific hurricane or tropical storm is a tropical cyclone that develops in the northeastern part of the Pacific Ocean. For organizational purposes, the northern Pacific Ocean is divided into three regions: the eastern, , central , and western...

. This timeline documents all the storm formations, strengthening, weakening, landfalls

Landfall (meteorology)

Landfall is the event of a tropical cyclone or a waterspout coming onto land after being over water. When a waterspout makes landfall it is reclassified as a tornado, which can then cause damage inland...

, extratropical transitions, as well as dissipation.

The first storm of the season, Hurricane Adrian formed off the southwest coast of Mexico. Thirteen tropical cyclones developed during the season. Most of these attained tropical storm status, and seven attained hurricane status. However this streak ended when Tropical Storm Fernanda formed and dissipated, never having reached hurricane strength.

May

No tropical cyclones formed during the month of May.

May 15

0700 UTC (12 a.m. PDT) – The 2011 East Pacific hurricane season officially begins.

June

June 1

0700 UTC (12 a.m. PDT) – The 2011 Central Pacific hurricane season officially begins.

June 7

1200 UTC (5 a.m. PDT) – Tropical Depression One-E, the first tropical depression of the season, forms from an area of low pressure south of Acapulco, Mexico.

June 8

0000 UTC (5 p.m. PDT June 7) – Tropical Depression One-E strengthens to Tropical Storm Adrian while meandering approximately 345 mi (555.2 km) south of Acapulco, Mexico.

June 9

0000 UTC (5 p.m. PDT June 8) –Tropical Storm Adrian strengthens to a Category 1 hurricane.
1200 UTC (5 a.m. PDT) – Hurricane Adrian strengthens to a Category 2 hurricane.
1800 UTC (11 a.m. PDT) – Hurricane Adrian rapidly strengthens to a Category 3 hurricane.

June 10

0000 UTC (5 p.m. PDT June 9) – Hurricane Adrian rapidly strengthens to a Category 4 hurricane.
0600 UTC (11 p.m. PDT June 9) – Hurricane Adrian attains its peak intensity with winds of 140 mph (225 km/h) and a minimum barometric pressure of 944 mbar
Bar (unit)
The bar is a unit of pressure equal to 100 kilopascals, and roughly equal to the atmospheric pressure on Earth at sea level. Other units derived from the bar are the megabar , kilobar , decibar , centibar , and millibar...

(hPa
Pascal (unit)
The pascal is the SI derived unit of pressure, internal pressure, stress, Young's modulus and tensile strength, named after the French mathematician, physicist, inventor, writer, and philosopher Blaise Pascal. It is a measure of force per unit area, defined as one newton per square metre...

; 27.88 inHg).
1800 UTC (11 a.m. PDT) – Hurricane Adrian weakens to a Category 3 hurricane.

June 11

0600 UTC (11 p.m. PDT June 10) – Hurricane Adrian rapidly weakens to a Category 1 hurricane.
1800 UTC (11 a.m. PDT) – Hurricane Adrian rapidly weakens to a tropical storm.

June 12

1200 UTC (5 a.m. PDT) – Tropical Storm Adrian degenerates into a post-tropical remnant low while located roughly 570 mi (917.3 km) southwest of Cabo San Lucas, Mexico.

June 19

0600 UTC (11 p.m. PDT June 18) – Tropical Depression Two-E forms about 260 miles (418.4 km) south-southwest Acapulco, Mexico.
1800 UTC (11 a.m. PDT) – Tropical Depression Two-E strengthens to Tropical Storm Beatriz.

June 20

1800 UTC (11 a.m. PDT) - Tropical Storm Beatriz strengthens to a Category 1 hurricane.

June 21

0600 UTC (11 p.m. PDT June 20) – Hurricane Beatriz attained its peak intensity with winds of 90 mph (150 km/h) and a minimum pressure of 977 mbar (hPa; 28.85 inHg).
1200 UTC (5 a.m. PDT) – Hurricane Beatriz weakens to a tropical storm.

June 22

0000 UTC (5 p.m. PDT June 21) – Tropical Storm Beatriz weakens to a tropical depression.
0600 UTC (11 p.m. PDT June 21) - Tropical Depression Beatriz dissipated about 86 miles (138.4 km) west of Manzanillo, Colima
Manzanillo, Colima
The name Manzanillo refers to the city as well as its surrounding municipality in the Mexican state of Colima. The city, located on the Pacific Ocean, contains Mexico's busiest port. Manzanillo was the third port created by the Spanish in the Pacific during the New Spain period...

, Mexico.

July

July 7

1500 UTC (8 a.m. PDT) – Tropical Depression Three-E forms south of Mexico.

July 8

0300 UTC (8 p.m. PDT July 7) – Tropical Depression Three-E strengthens to Tropical Storm Calvin.
2100 UTC (2 p.m. PDT) – Tropical Storm Calvin strengthens to a Category 1 hurricane.

July 9

1500 UTC (8 a.m. PDT) – Hurricane Calvin weakens to a tropical storm.

July 10

0300 UTC (8 p.m. PDT July 9) – Tropical Storm Calvin degenerates into a remnant low.

July 17

1500 UTC (8 a.m. PDT) – Tropical Depression Four-E forms 265 miles (425 km) south-southwest of San Salvador
San Salvador
The city of San Salvador the capital and largest city of El Salvador, which has been designated a Gamma World City. Its complete name is La Ciudad de Gran San Salvador...

.
1800 UTC (11 a.m. PDT) - Tropical Depression Four-E strengthens to Tropical Storm Dora.

July 20

0300 UTC (8 p.m. PDT July 19) - Tropical Storm Dora strengthens to a Category 1 hurricane.
1800 UTC (11 a.m. PDT) - Hurricane Dora strengthens to a Category 2 hurricane.
2100 UTC (2 p.m. PDT) - Hurricane Dora strengthens into a Category 3 hurricane.

July 21

0000 UTC (5 p.m. PDT July 20) - Hurricane Dora strengthens to a Category 4 hurricane.

July 22

0300 UTC (8 p.m. PDT July 21) - Hurricane Dora weakens into a Category 3 hurricane.
0900 UTC (2 a.m. PDT) - Hurricane Dora weakens into a Category 2 hurricane.
1200 UTC (5 a.m. PDT) - Hurricane Dora weakens into a Category 1 hurricane.

July 23

0000 UTC (5 p.m. PDT July 22) - Hurricane Dora weakens into a Tropical Storm.

July 24

2100 UTC (2 p.m. PDT July 24) - Tropical Storm Dora degenerates into a remnant low.

July 31

0600 UTC (11 p.m. PDT July 30) – An area of disturbed weather 435 mi (700.1 km) south of Acapulco
Acapulco
Acapulco is a city, municipality and major sea port in the state of Guerrero on the Pacific coast of Mexico, southwest from Mexico City. Acapulco is located on a deep, semi-circular bay and has been a port since the early colonial period of Mexico’s history...

is upgraded to Tropical Depression Five-E.
1200 UTC (5 a.m. PDT) – Tropical Depression Five-E strengthens to Tropical Storm Eugene.

August

August 1

1800 UTC (11 a.m. PDT) – Tropical Storm Eugene strengthens to a Category 1 hurricane.

August 2

1800 UTC (11 a.m. PDT) – Hurricane Eugene intensifies to a Category 2 hurricane.

August 3

0600 UTC (11 p.m. PDT August 2) – Hurricane Eugene intensifies to a Category 3 major hurricane while located approximately 575 mi (925.4 km) south-southwest of the southern tip of the Baja California Peninsula
Baja California Peninsula
The Baja California peninsula , is a peninsula in northwestern Mexico. Its land mass separates the Pacific Ocean from the Gulf of California. The Peninsula extends from Mexicali, Baja California in the north to Cabo San Lucas, Baja California Sur in the south.The total area of the Baja California...

.
1800 UTC (11 a.m. PDT) – Hurricane Eugene rapidly intensifies to a Category 4 hurricane.
2100 UTC (2 p.m. PDT) – Hurricane Eugene attains its peak intensity with a barometric pressure of 942 mbar (hPa; 27.82 inHg) and winds of 140 mph (220 km/h).

August 4

0600 UTC (11 p.m. PDT August 3) – Hurricane Eugene rapidly weakens to a Category 3 hurricane.
1800 UTC (11 a.m. PDT) – Hurricane Eugene rapidly weakens to a Category 2 hurricane.

August 5

0000 UTC (5 p.m. PDT August 4) – Hurricane Eugene rapidly weakens further to a Category 1 hurricane.
1200 UTC (11 a.m. PDT) – Hurricane Eugene is downgraded to a tropical storm.

August 6

1200 UTC (11 a.m. PDT) – Tropical Storm Eugene degenerates into a post-tropical remnant low pressure area roughly 1130 mi (1,818.6 km) west of the southern tip of the Baja California peninsula.

August 15

2100 UTC (2 p.m PDT) - Tropical Depression Six-E formed about 1630 mi (2,623.2 km) east-southeast of Ka Lae
Ka Lae
Ka Lae , also known as South Point, is the southernmost point of the Big Island of Hawaii and of the 50 United States. The Ka Lae area is registered as a National Historic Landmark District under the name South Point Complex...

, Hawaii
Hawaii
Hawaii is the newest of the 50 U.S. states , and is the only U.S. state made up entirely of islands. It is the northernmost island group in Polynesia, occupying most of an archipelago in the central Pacific Ocean, southwest of the continental United States, southeast of Japan, and northeast of...

.

August 16

1500 UTC (8 a.m. PDT) - Tropical Depression Six-E strengthens into Tropical Storm Fernanda.
2100 UTC (2 p.m. PDT) - Tropical Depression Seven-E formed 215 mi (346 km) south of Acapulco, Mexico.

August 17

0900 UTC (2 a.m. PDT) - Tropical Depression Seven-E strengthens into Tropical Storm Greg.

August 18

0300 UTC (8 p.m. PDT) - Tropical Storm Greg strengthens into a Category 1 hurricane.

August 19

1500 UTC (8 a.m. PDT) - Hurricane Greg weakens into a tropical storm.
2100 UTC (11 a.m. HST) - Tropical Storm Fernanda weakens to a tropical depression.

August 20

0300 UTC (5 p.m. HST August 19) - Tropical Depression Fernanda degenerates to a post-tropical cyclone.

August 21

0300 UTC (8 p.m. PDT August 20) - Tropical Storm Greg weakens to a tropical depression.
1500 UTC (8 a.m. PDT) - Tropical Depression Greg degenerates into a remnant low.

August 31

1800 UTC (11 a.m. PDT) - Tropical Depression Eight forms 45 miles (72.4 km) west-northwest of Lazaro Cardenas
Lázaro Cárdenas
Lázaro Cárdenas del Río was President of Mexico from 1934 to 1940.-Early life:Lázaro Cárdenas was born on May 21, 1895 in a lower-middle class family in the village of Jiquilpan, Michoacán. He supported his family from age 16 after the death of his father...

, Mexico.

September

September 1

0300 UTC (8 p.m. PDT August 31) - Tropical Depression Eight-E dissipates.

September 21

0900 UTC (2 a.m. PDT) - Tropical Depression Nine-E forms about 170 miles south-southeast of Puerto Escondido, Mexico.
1500 UTC (8 a.m. PDT)- Tropical Depression Nine-E strengthens to Tropical Storm Hilary.

September 22

1500 UTC (8 a.m. PDT) - Tropical Storm Hilary strengthens into a Category 1 hurricane.
2100 UTC (2 p.m. PDT) - Hurricane Hilary strengthens into a Category 2 hurricane.
0000 UTC (5 p.m. PDT) - Hurricane Hilary strengthens into a Category 3 hurricane.

September 23

0300 UTC (8 p.m. PDT September 22) - Hurricane Hilary strengthens into a Category 4 hurricane.

September 25

0900 UTC (2 a.m. PDT) - Hurricane Hilary weakens into a Category 3 hurricane.

September 26

2100 UTC (2 p.m. PDT) - Hurricane Hilary restrengthens into a Category 4 hurricane.

September 27

0000 UTC (8 p.m. PDT September 26) - Hurricane Hilary weakens into a Category 3 hurricane.
2100 UTC (2 p.m. PDT) - Hurricane Hilary weakens into a Category 2 hurricane.

September 28

0900 UTC (2 a.m. PDT) - Hurricane Hilary weakens into a Category 1 hurricane.

September 29

0300 UTC (8 p.m. PDT) - Hurricane Hilary weakens into a tropical storm.

September 30

0900 UTC (2 a.m. PDT) - Tropical Storm Hilary weakens into a tropical depression.
2100 UTC (2 p.m. PDT) - Tropical Depression Hilary dissipates into a remnant low.

October

October 6

0300 UTC (8 p.m. PDT October 5) - Tropical Depression Ten-E forms about 625 miles (1005 km) south of Manzanillo, Mexico.
0900 UTC (2 a.m. PDT) - Tropical Depression Eleven-E forms about 885 miles (1425 km) south-southwest of the southern tip of Baja California
Baja California
Baja California officially Estado Libre y Soberano de Baja California is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is both the northernmost and westernmost state of Mexico. Before becoming a state in 1953, the area was known as the North...

.

1500 UTC (8 a.m. PDT) - Tropical Depression Eleven-E strengthens into Tropical Storm Irwin.
2100 UTC (2 p.m. PDT) - Tropical Depression Ten-E strengthens into Tropical Storm Jova.

October 7

0900 UTC (2 a.m. PDT) - Tropical Storm Irwin strengthens into a Category 1 hurricane.

October 8

2100 UTC (2 p.m. PDT) - Tropical Storm Jova strengthens into a Category 1 hurricane.
2100 UTC (2 p.m. PDT) - Hurricane Irwin weakens into a tropical storm.

October 10

0300 UTC (8 p.m. PDT October 9) - Hurricane Jova strengthens into a Category 2 hurricane.
0900 UTC (2 a.m. PDT) - Hurricane Jova strengthens into a Category 3 major hurricane.

October 11

0300 UTC (8 p.m. PDT October 10) - Tropical Storm Irwin weakens into a tropical depression.
1500 UTC (8 a.m. PDT) - Tropical Depression Irwin restrengthens into a tropical storm.

October 12

0700 UTC (12 a.m. PDT) - Hurricane Jova makes landfall in Jalisco
Jalisco
Jalisco officially Estado Libre y Soberano de Jalisco is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is located in Western Mexico and divided in 125 municipalities and its capital city is Guadalajara.It is one of the more important states...

, Mexico.
0900 UTC (2 a.m. PDT) - Tropical Depression Twelve-E forms just south of the Gulf of Tehuantepec
Gulf of Tehuantepec
Gulf of Tehuantepec is a large body of water on the Pacific coast of the Isthmus of Tehuantepec, southeastern Mexico, at . Most of the hurricanes that form in the Eastern Pacific organize in or near this body of water...

.

October 13

0300 UTC (8 p.m. PDT October 12) - Tropical Storm Irwin weakens into a tropical depression.
0300 UTC (8 p.m. PDT October 12) - Tropical Depression Jova degenerates into a remnant low.
0300 UTC (8 p.m. PDT October 12) - Tropical Depression Twelve-E degenerates into a remnant low.
2100 UTC (2 p.m. PDT) - Tropical Depression Irwin restrengthens into a tropical storm.

October 16

0300 UTC (8 p.m. PDT October 15) - Tropical Storm Irwin weakens into a tropical depression.

October 17

0300 UTC (8 p.m. PDT October 16) - Tropical Depression Irwin degenerates into a remnant low.

November

November 18

2100 UTC (1 p.m. PST) - Tropical Depression Thirteen-E forms about 480 miles (775 km) south of Acapulco, Mexico.

November 20

2100 UTC (1 p.m. PST) - Tropical Depression Thirteen-E strengthens into Tropical Storm Kenneth.

November 21

1500 UTC (7 a.m. PST) - Tropical Storm Kenneth strengthens into a Category 1 hurricane.

November 22

0300 UTC (7 p.m. PST November 21) - Hurricane Kenneth strengthens into a Category 2 hurricane.
0900 UTC (1 a.m. PST) - Hurricane Kenneth strengthens into a Category 3 hurricane.
1500 UTC (7 a.m. PST) - Hurricane Kenneth strengthens into a Category 4 hurricane, becoming the strongest eastern Pacific hurricane in November on record.

November 23

0900 UTC (1 a.m. PST) - Hurricane Kenneth weakens into a Category 2 hurricane.
1500 UTC (7 a.m. PST) - Hurricane Kenneth weakens into a Category 1 hurricane.
2100 UTC (1 p.m. PST) - Hurricane Kenneth weakens into a tropical storm.

November 25

0900 UTC (1 a.m. PST) - Tropical Storm Kenneth weakens into a tropical depression.
1500 UTC (7 a.m. PST) - Tropical Depression Kenneth becomes post-tropical 1250 miles (2010 km) west-southwest of the southern tip of Baja California
Baja California
Baja California officially Estado Libre y Soberano de Baja California is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is both the northernmost and westernmost state of Mexico. Before becoming a state in 1953, the area was known as the North...

.

November 30

The 2011 Pacific hurricane season officially ends.

External links

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May