The 2012 Pacific hurricane season was an above-average year in which seventeen named storms formed. The hurricane season officially began on May 15 in the east Pacific—defined as the region east of 140°W—and on June 1 in the central Pacific—defined as the region west of 140°W to the International Date Line—and ended on November 30 in both regions. These dates conventionally delimit the period during each year when most tropical cyclones form in the northeastern Pacific Ocean. This year, the first storm of the season, Tropical Storm Aletta, formed on May 14, and the last, Tropical Storm Rosa, dissipated on November 3.

The season produced seventeen tropical storms; ten became hurricanes, and five further intensified into major hurricanes. Impact during the season was relatively minimal. In late May, Hurricane Bud paralleled the western Mexico coastline before dissipating, causing minor damage and but no reported fatalities. In mid-June, Hurricane Carlotta came ashore in Oaxaca at Category 2 hurricane intensity, making it the easternmost tropical cyclone in the basin to make landfall at hurricane intensity since 1966. The storm killed seven and caused $12.4 million (2012 USD) in damage.

This timeline includes information that was not released in real time, meaning that data from post-storm reviews by the National Hurricane Center, such as a storm that was not operationally warned upon, has been included. This timeline documents tropical cyclone formations, strengthening, weakening, landfalls, extratropical transitions, and dissipations during the season.

Timeline

May
May 14

1200 UTC (5:00 a.m. PDT) – Tropical Depression One-E develops from an area of low pressure about  south of Manzanillo, Mexico.
May 15
The 2012 Pacific hurricane season officially begins.
0000 UTC (5:00 p.m. PDT May 14) – Tropical Depression One-E intensifies into Tropical Storm Aletta.
May 16
0000 UTC (5:00 p.m. PDT May 15) – Tropical Storm Aletta attains its peak intensity with maximum sustained winds of  and a minimum barometric pressure of 1000 mb (hPa; 29.53 inHg).
May 17
0600 UTC (11:00 p.m. PDT May 16) – Tropical Storm Aletta weakens to a tropical depression roughly  southwest of the southern tip of Baja California.
May 19
0600 UTC (11:00 p.m. PDT May 18) – Tropical Depression Aletta degenerates into a non-convective remnant area of low pressure.
May 20
1800 UTC (11:00 a.m. PDT) – Tropical Depression Two-E develops from an area of low pressure about  south of Acapulco, Mexico.
May 22
0600 UTC (11:00 p.m. PDT May 21) – Tropical Depression Two-E intensifies into Tropical Storm Bud roughly  south-southwest of Acapulco, Mexico.
May 24

0000 UTC (5:00 p.m. PDT May 23) – Tropical Storm Bud intensifies into a Category 1 hurricane on the Saffir–Simpson hurricane wind scale, becoming the first of the 2012 season.
1200 UTC (5:00 a.m. PDT) – Hurricane Bud intensifies into a Category 2 hurricane.
May 25
0000 UTC (5:00 p.m. PDT May 24) – Hurricane Bud intensifies into a Category 3 hurricane, the first major hurricane of the 2012 season, and simultaneously attains its peak intensity with winds of  and a minimum barometric pressure of 961 mb (hPa; 28.38 inHg).
0600 UTC (11:00 p.m. PDT May 24) – Hurricane Bud weakens to a Category 2 hurricane.
1800 UTC (11:00 a.m. PDT) – Hurricane Bud weakens to a Category 1 hurricane about  west-southwest of Manzanillo, Mexico.
May 26
0000 UTC (5:00 p.m. PDT May 25) – Hurricane Bud weakens to a tropical storm.
0600 UTC (11:00 p.m. PDT May 25) – Tropical Storm Bud degenerates into a non-convective remnant area of low pressure near the southwestern coast of Mexico.

June
June 14
0000 UTC (5:00 p.m. PDT June 13) – Tropical Depression Three-E develops from an area of low pressure roughly  south-southeast of Huatulco, Mexico.
0600 UTC (11:00 p.m. PDT June 13) – Tropical Depression Three-E intensifies into Tropical Storm Carlotta.
June 15

1200 UTC (5:00 a.m. PDT) – Tropical Storm Carlotta intensifies into a Category 1 hurricane about  southeast of Acapulco, Mexico.
1800 UTC (11:00 a.m. PDT) – Hurricane Carlotta rapidly intensifies into a Category 2 hurricane.
2100 UTC (2:00 p.m. PDT) – Hurricane Carlotta attains its peak intensity with maximum sustained winds of  and a minimum barometric pressure of 973 mb (hPa; 28.71 inHg).
June 16
0100 UTC (6:00 p.m. PDT June 15) – Hurricane Carlotta makes landfall near Puerto Escondido, Mexico, with winds of .
0600 UTC (11:00 p.m. PDT June 15) – Hurricane Carlotta weakens to a Category 1 hurricane.
0900 UTC (2:00 a.m. PDT) – Hurricane Carlotta weakens to a tropical storm.
1200 UTC (5:00 a.m. PDT) – Tropical Storm Carlotta weakens to a tropical depression roughly  north-northeast of Acapulco, Mexico.
June 17
0000 UTC (5:00 p.m. PDT June 16) – Tropical Depression Carlotta degenerates into a non-convective remnant area of low pressure about  northeast of Zihuatanejo, Mexico.

July
July 4
0600 UTC (11:00 p.m. PDT July 3) – Tropical Depression Four-E develops from an area of low pressure about  south of Manzanillo, Mexico.
July 5
0600 UTC (11:00 p.m. PDT July 4) – Tropical Depression Four-E intensifies into Tropical Storm Daniel roughly  southwest of Manzanillo, Mexico.
July 7

0000 UTC (5:00 p.m. PDT July 6) Tropical Storm Daniel intensifies into a Category 1 hurricane about  southwest of the southern tip of Baja California.
1800 UTC (11:00 a.m. PDT) – Tropical Depression Five-E develops from an area of low pressure roughly  south-southwest of Acapulco, Mexico.
July 8
0000 UTC (5:00 p.m. PDT July 7) – Hurricane Daniel intensifies into a Category 2 hurricane.
0000 UTC (5:00 p.m. PDT July 7) – Tropical Depression Five-E intensifies into Tropical Storm Emilia about  south-southwest of Acapulco, Mexico.
0600 UTC (11:00 p.m. PDT July 7) – Hurricane Daniel intensifies into a Category 3 hurricane and simultaneously attains its peak intensity with winds of  and a minimum barometric pressure of 961 mb (hPa; 28.38 inHg).
1200 UTC (5:00 a.m. PDT) – Hurricane Daniel weakens to a Category 2 hurricane roughly  southwest of the southern tip of Baja California.
July 9
0600 UTC (11:00 p.m. PDT July 8) – Hurricane Daniel weakens to a Category 1 hurricane.
0600 UTC (11:00 p.m. PDT July 8) – Tropical Storm Emilia intensifies into a Category 1 hurricane about  southwest of Acapulco, Mexico.
1200 UTC (5:00 a.m. PDT) – Hurricane Emilia rapidly intensifies into a Category 2 hurricane.
July 10

0000 UTC (5:00 p.m. PDT July 9) – Hurricane Emilia rapidly intensifies into a Category 3 hurricane.
0600 UTC (11:00 p.m. PDT July 9) – Hurricane Daniel weakens to a tropical storm about  southeast of the Hawaiian Islands.
0600 UTC (11:00 p.m. PDT July 9) – Hurricane Emilia intensifies into a Category 4 hurricane and simultaneously attains its peak intensity with winds of  and a minimum barometric pressure of 945 mb (hPa; 27.91 inHg).
1800 UTC (11:00 a.m. PDT) – Hurricane Emilia weakens to a Category 3 hurricane.
July 11
0000 UTC (5:00 p.m. PDT July 10) – Hurricane Emilia weakens to a Category 2 hurricane roughly  south-southwest of the southern tip of Baja California.
1800 UTC (11:00 a.m. PDT) – Tropical Storm Daniel weakens to a tropical depression.
1800 UTC (11:00 a.m. PDT) – Hurricane Emilia re-intensifies into a Category 3 hurricane.
July 12
0000 UTC (5:00 p.m. PDT July 11) – Tropical Depression Six-E develops from an area of low pressure about  south of Mazanillo, Mexico.
0600 UTC (11:00 p.m. PDT July 11) – Tropical Depression Six-E intensifies into Tropical Storm Fabio.
1200 UTC (5:00 a.m. PDT) – Tropical Depression Daniel degenerates into a non-convective remnant area of low pressure roughly  southeast of the Hawaiian Islands.
1800 UTC (11:00 a.m. PDT) – Hurricane Emilia weakens to a Category 2 hurricane for a second time.
July 13
0000 UTC (5:00 p.m. PDT July 12) – Hurricane Emilia weakens to a Category 1 hurricane about  southwest of the southern tip of Baja California.
1200 UTC (5:00 a.m. PDT) – Hurricane Emilia weakens to a tropical storm.
1800 UTC (11:00 a.m. PDT) – Tropical Storm Fabio intensifies into a Category 1 hurricane roughly  southwest of Manzanillo, Mexico.
July 14

1800 UTC (11:00 a.m. PDT) – Hurricane Fabio intensifies into a Category 2 hurricane.
July 15
0600 UTC (11:00 p.m. PDT July 14) – Hurricane Fabio attains its peak intensity with maximum sustained winds of  and a minimum barometric pressure of 966 mb (hPa; 28.53 inHg).
1800 UTC (11:00 a.m. PDT) – Tropical Storm Emilia degenerates into a non-convective remnant area of low pressure roughly  southeast of the Hawaiian Islands.
July 16
0000 UTC (5:00 p.m. PDT July 15) – Hurricane Fabio weakens to a Category 1 hurricane.
1800 UTC (11:00 a.m. PDT) – Hurricane Fabio weakens to a tropical storm about  southwest of the southern tip of Baja California.
July 18
0000 UTC (5:00 p.m. PDT July 17) – Tropical Storm Fabio weakens to a tropical depression.
1200 UTC (5:00 a.m. PDT) – Tropical Depression Fabio degenerates into a non-convective remnant area of low pressure roughly  west-southwest of Punta Eugenia, Mexico.

August
August 7
0600 UTC (11:00 p.m. PDT August 6) – Tropical Depression Seven-E develops from an area of low pressure about  west-southwest of Manzanillo, Mexico.
1800 UTC (11:00 a.m. PDT) – Tropical Depression Seven-E intensifies into Tropical Storm Gilma roughly  west-southwest of Manzanillo, Mexico.
August 8

1800 UTC (11:00 a.m. PDT) – Tropical Storm Gilma intensifies into a Category 1 hurricane.
August 9
0600 UTC (11:00 p.m. PDT August 8) – Hurricane Gilma attains its peak intensity with maximum sustained winds of  and a minimum barometric pressure of 984 mb (hPa; 29.06 inHg).
1800 UTC (11:00 a.m. PDT) – Hurricane Gilma weakens to a tropical storm about  southwest of the southern tip of Baja California.
August 11
1200 UTC (5:00 a.m. PDT) – Tropical Storm Gilma degenerates into a non-convective remnant area of low pressure roughly  west-southwest of the southern tip of Baja California.
1200 UTC (5:00 a.m. PDT) – Tropical Depression Eight-E develops from an area of low pressure about  south-southwest of Manzanillo, Mexico.
1800 UTC (11:00 a.m. PDT) – Tropical Depression Eight-E intensifies into Tropical Storm Hector roughly  south-southwest of Manzanillo, Mexico.
August 12
1200 UTC (5:00 a.m. PDT) – Tropical Storm Hector attains its peak intensity with maximum sustained winds of  and a minimum barometric pressure of 995 mb (hPa; 29.39 inHg).
August 15
1200 UTC (5:00 a.m. PDT) – Tropical Storm Hector weakens to a tropical depression about  southwest of the southern tip of Baja California.
August 17
0000 UTC (5:00 p.m. PDT August 16) – Tropical Depression Hector degenerates into a non-convective remnant area of low pressure roughly  southwest of the southern tip of Baja California.
August 27
1200 UTC (5:00 a.m. PDT) – Tropical Depression Nine-E develops from an area of low pressure about  south-southwest of Manzanillo, Mexico.
1800 UTC (11:00 a.m. PDT) – Tropical Depression Nine-E intensifies into Tropical Storm Ileana roughly  south-southwest of Manzanillo, Mexico.
August 30

0000 UTC (5:00 p.m. PDT August 29) – Tropical Storm Ileana intensifies into a Category 1 hurricane about  south-southwest of the southern tip of Baja California.
1800 UTC (11:00 a.m. PDT) – Hurricane Ileana attains its peak intensity with maximum sustained winds of 85 mph (140 km) and a minimum barometric pressure of 978 mb (hPa; 28.88 inHg).
August 31
1800 UTC (11:00 a.m. PDT) – Hurricane Ileana weakens to a tropical storm roughly  west-southwest of the southern tip of Baja California.

September
September 2
0600 UTC (11:00 p.m. PDT September 1) – Tropical Storm Ileana weakens to a tropical depression about  west of the southern tip of Baja California.
1200 UTC (5:00 a.m. PDT) – Tropical Depression Ileana degenerates into a non-convective remnant area of low pressure roughly  east-southeast of the Hawaiian Islands.
1200 UTC (5:00 a.m. PDT) – Tropical Storm John develops from an area of low pressure about  southwest of Manzanillo, Mexico.
September 3
0000 UTC (5:00 p.m. PDT September 2) – Tropical Storm John attains its peak intensity with maximum sustained winds of  and a minimum barometric pressure of 1000 mb (hPa; 29.53 inHg).
September 4
0000 UTC (5:00 p.m. PDT September 3) – Tropical Storm John weakens to a tropical depression.
1200 UTC (5:00 a.m. PDT) – Tropical Depression John degenerates into a non-convective remnant area of low pressure roughly  west-northwest of the southern tip of Baja California.
September 12

0600 UTC (11:00 p.m. PDT September 11) – Tropical Depression Eleven-E develops from an area of low pressure about  south-southwest of Manzanillo, Mexico.
1200 UTC (5:00 a.m. PDT) – Tropical Depression Eleven-E intensifies into Tropical Storm Kristy roughly  south-southwest of Manzanillo, Mexico.
September 14
0600 UTC (11:00 p.m. PDT September 13) – Tropical Storm Kristy attains its peak intensity with maximum sustained winds of  and a minimum barometric pressure of 998 mb (hPa; 29.47 inHg).
September 15
1200 UTC (5:00 a.m. PDT) – Tropical Depression Twelve-E develops from an area of low pressure about  southwest of Cabo San Lucas, Mexico.
1800 UTC (11:00 a.m. PDT) – Tropical Depression Twelve-E intensifies into Tropical Storm Lane.
September 16
1800 UTC (11:00 a.m. PDT) – Tropical Storm Kristy weakens to a tropical depression about  west-northwest of Cabo San Lucas, Mexico.
September 17

0600 UTC (11:00 p.m. PDT September 16) – Tropical Depression Kristy degenerates into a non-convective remnant area of low pressure roughly  west-northwest of Cabo San Lucas, Mexico.
0600 UTC (11:00 p.m. PDT September 16) – Tropical Storm Lane intensifies into a Category 1 hurricane about  southwest of the southern tip of Baja California.
September 18
0000 UTC (5:00 p.m. PDT September 17) – Hurricane Lane attains its peak intensity with maximum sustained winds of  and a minimum barometric pressure of 985 mb (hPa; 28.29 inHg).
1200 UTC (5:00 a.m. PDT) – Hurricane Lane weakens to a tropical storm.
September 19
0600 UTC (11:00 p.m. PDT September 18) – Tropical Storm Lane degenerates into a non-convective remnant area of low pressure roughly  west-southwest of the southern tip of Baja California.
September 22
0000 UTC (5:00 p.m. PDT September 21) – Tropical Depression Thirteen-E develops from an area of low pressure about  south-southwest of Manzanillo, Mexico.
1200 UTC (5:00 a.m. PDT) – Tropical Depression Thirteen-E intensifies into Tropical Storm Miriam.
September 24
0000 UTC (5:00 p.m. PDT September 23) – Tropical Storm Miriam intensifies into a Category 1 hurricane roughly  southwest of Manzanillo, Mexico.
0600 UTC (11:00 p.m. PDT September 23) – Hurricane Miriam rapidly intensifies into a Category 2 hurricane.
1200 UTC (5:00 a.m. PDT) – Hurricane Miriam rapidly intensifies into a Category 3 hurricane and simultaneously attains its peak intensity with maximum sustained winds of  and a minimum barometric pressure of 959 mb (hPa; 28.32 inHg).

September 25
0600 UTC (11:00 p.m. PDT September 24) – Hurricane Miriam weakens to a Category 2 hurricane.
1800 UTC (11:00 a.m. PDT) – Hurricane Miriam weakens to a Category 1 hurricane about  west of Manzanillo, Mexico.
September 26
0600 UTC (11:00 p.m. PDT September 25) – Hurricane Miriam weakens to a tropical storm.
September 27
1800 UTC (11:00 a.m. PDT) – Tropical Storm Miriam degenerates into a non-convective remnant area of low pressure roughly  west-southwest of the southern tip of Baja California.
September 28
0600 UTC (11:00 p.m. PDT September 27) – Tropical Storm Norman develops from an area of low pressure about  southeast of Cabo San Lucas, Mexico and simultaneously attains its peak intensity with maximum sustained winds of  and a minimum barometric pressure of 997 mb (hPa; 29.44 inHg).
September 29
0500 UTC (10:00 p.m. PDT September 27) – Tropical Storm Norman weakens to a tropical depression and simultaneously makes landfall near Topolobampo, Mexico, with winds of .
1200 UTC (5:00 a.m. PDT) – Tropical Depression Norman degenerates into a non-convective remnant area of low pressure about  west-northwest of Los Mochis, Mexico.

October
October 6

1200 UTC (5:00 a.m. PDT) – Tropical Depression Fifteen-E develops from an area of low pressure roughly  southwest of the southern tip of Baja California.
1800 UTC (11:00 a.m. PDT) – Tropical Depression Fifteen-E intensifies into Tropical Storm Olivia about  southwest of the southern tip of Baja California.
October 7
1200 UTC (5:00 a.m. PDT) – Tropical Storm Olivia attains its peak intensity with maximum sustained winds of  a minimum barometric pressure of 997 mb (hPa; 29.44 inHg).
October 9
0000 UTC (5:00 p.m. PDT October 8) – Tropical Storm Olivia degenerates into a non-convective remnant area of low pressure roughly .
October 13
1200 UTC (5:00 a.m. PDT) – Tropical Depression Sixteen-E develops from an area of low pressure about  south-southwest of Cabo San Lucas, Mexico.
1800 UTC (11:00 a.m. PDT) – Tropical Depression Sixteen-E intensifies into Tropical Storm Paul.
October 15

0600 UTC (11:00 p.m. PDT October 14) – Tropical Storm Paul intensifies into a Category 1 hurricane roughly  southwest of Cabo San Lucas, Mexico.
1800 UTC (11:00 a.m. PDT) – Hurricane Paul rapidly intensifies into a Category 3 hurricane and simultaneously attains its peak intensity with maximum sustained winds of  and a minimum barometric pressure of 959 mb (hPa; 28.32 inHg).
October 16
1200 UTC (5:00 a.m. PDT) – Hurricane Paul weakens to a Category 2 hurricane.
1800 UTC (11:00 a.m. PDT) – Hurricane Paul weakens to a Category 1 hurricane about  south-southwest of Cabo San Lazaro, Mexico.
October 17
0000 UTC (5:00 p.m. PDT October 16) – Hurricane Paul weakens to a tropical storm.
0600 UTC (11:00 p.m. PDT October 16) – Tropical Storm Paul degenerates into a non-convective remnant area of low pressure roughly  northwest of Cabo San Lazaro, Mexico.
October 30
0600 UTC (11:00 p.m. PDT October 29) – Tropical Depression Seventeen-E develops from an area of low pressure about  south-southwest of the southern tip of Baja California.
1200 UTC (5:00 a.m. PDT) – Tropical Depression Seventeen-E intensifies into Tropical Storm Rosa.
October 31
0600 UTC (11:00 p.m. PDT October 30) – Tropical Storm Rosa attains its peak intensity with maximum sustained winds of  and a minimum barometric pressure of 1001 mb (hPa; 29.56 inHg).

November
November 3
1200 UTC (5:00 a.m. PDT) – Tropical Storm Rosa weakens to a tropical depression roughly  southwest of the southern tip of Baja California.
1800 UTC (11:00 a.m. PDT) – Tropical Depression Rosa degenerates into a non-convective remnant area of low pressure about  southwest of Cabo San Lucas, Mexico.
November 30
The 2012 Pacific hurricane season officially ends.

See also

List of Pacific hurricanes
Timeline of the 2012 Atlantic hurricane season
Timeline of the 2012 Pacific typhoon season

Footnotes

References

External links

 The National Climatic Data Center (NCDC)'s 2012 Annual Tropical Cyclones Report
 The National Hurricane Center (NHC)'s 2012 Tropical Cyclone Advisory Archive

2012 Pacific hurricane season
Pacific hurricane meteorological timelines
Articles which contain graphical timelines
2012 EPac T