Timeline of the 2012 Pacific hurricane season

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.

May
May 14 May 15 May 16 May 17 May 19 May 20 May 22 May 24 May 25 May 26
 * 1200 UTC (5:00 a.m. PDT) – Tropical Depression One-E develops from an area of low pressure about 655 mi south of Manzanillo, Mexico.
 * 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.
 * 0000 UTC (5:00 p.m. PDT May 15) – Tropical Storm Aletta attains its peak intensity with maximum sustained winds of 50 mph and a minimum barometric pressure of 1000 mb (hPa; 29.53 inHg).
 * 0600 UTC (11:00 p.m. PDT May 16) – Tropical Storm Aletta weakens to a tropical depression roughly 825 mi southwest of the southern tip of Baja California.
 * 0600 UTC (11:00 p.m. PDT May 18) – Tropical Depression Aletta degenerates into a non-convective remnant area of low pressure.
 * 1800 UTC (11:00 a.m. PDT) – Tropical Depression Two-E develops from an area of low pressure about 520 mi south of Acapulco, Mexico.
 * 0600 UTC (11:00 p.m. PDT May 21) – Tropical Depression Two-E intensifies into Tropical Storm Bud roughly 495 mi south-southwest of Acapulco, Mexico.
 * 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.
 * 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 115 mph 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 80 mi west-southwest of Manzanillo, Mexico.
 * 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 June 15 June 16 June 17
 * 0000 UTC (5:00 p.m. PDT June 13) – Tropical Depression Three-E develops from an area of low pressure roughly 530 mi south-southeast of Huatulco, Mexico.
 * 0600 UTC (11:00 p.m. PDT June 13) – Tropical Depression Three-E intensifies into Tropical Storm Carlotta.
 * 1200 UTC (5:00 a.m. PDT) – Tropical Storm Carlotta intensifies into a Category 1 hurricane about 365 mi 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 110 mph and a minimum barometric pressure of 973 mb (hPa; 28.71 inHg).
 * 0100 UTC (6:00 p.m. PDT June 15) – Hurricane Carlotta makes landfall near Puerto Escondido, Mexico, with winds of 105 mph.
 * 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 60 mi north-northeast of Acapulco, Mexico.
 * 0000 UTC (5:00 p.m. PDT June 16) – Tropical Depression Carlotta degenerates into a non-convective remnant area of low pressure about 100 mi northeast of Zihuatanejo, Mexico.

July
July 4 July 5 July 7 July 8 July 9 July 10 July 11 July 12 July 13 July 14 July 15 July 16 July 18
 * 0600 UTC (11:00 p.m. PDT July 3) – Tropical Depression Four-E develops from an area of low pressure about 490 mi south of Manzanillo, Mexico.
 * 0600 UTC (11:00 p.m. PDT July 4) – Tropical Depression Four-E intensifies into Tropical Storm Daniel roughly 475 mi southwest of Manzanillo, Mexico.
 * 0000 UTC (5:00 p.m. PDT July 6) Tropical Storm Daniel intensifies into a Category 1 hurricane about 720 mi 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 495 mi south-southwest of Acapulco, Mexico.
 * 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 490 mi 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 115 mph 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 1,015 mi southwest of the southern tip of Baja California.
 * 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 680 mi southwest of Acapulco, Mexico.
 * 1200 UTC (5:00 a.m. PDT) – Hurricane Emilia rapidly intensifies into a Category 2 hurricane.
 * 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 1,465 mi 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 135 mph 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.
 * 0000 UTC (5:00 p.m. PDT July 10) – Hurricane Emilia weakens to a Category 2 hurricane roughly 685 mi 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.
 * 0000 UTC (5:00 p.m. PDT July 11) – Tropical Depression Six-E develops from an area of low pressure about 405 mi 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 665 mi southeast of the Hawaiian Islands.
 * 1800 UTC (11:00 a.m. PDT) – Hurricane Emilia weakens to a Category 2 hurricane for a second time.
 * 0000 UTC (5:00 p.m. PDT July 12) – Hurricane Emilia weakens to a Category 1 hurricane about 1,000 mi 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 515 mi southwest of Manzanillo, Mexico.
 * 1800 UTC (11:00 a.m. PDT) – Hurricane Fabio intensifies into a Category 2 hurricane.
 * 0600 UTC (11:00 p.m. PDT July 14) – Hurricane Fabio attains its peak intensity with maximum sustained winds of 110 mph 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 1,110 mi southeast of the Hawaiian Islands.
 * 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 700 mi southwest of the southern tip of Baja California.
 * 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 400 mi west-southwest of Punta Eugenia, Mexico.

August
August 7 August 8 August 9 August 11 August 12 August 15 August 17 August 27 August 30 August 31
 * 0600 UTC (11:00 p.m. PDT August 6) – Tropical Depression Seven-E develops from an area of low pressure about 600 mi west-southwest of Manzanillo, Mexico.
 * 1800 UTC (11:00 a.m. PDT) – Tropical Depression Seven-E intensifies into Tropical Storm Gilma roughly 565 mi west-southwest of Manzanillo, Mexico.
 * 1800 UTC (11:00 a.m. PDT) – Tropical Storm Gilma intensifies into a Category 1 hurricane.
 * 0600 UTC (11:00 p.m. PDT August 8) – Hurricane Gilma attains its peak intensity with maximum sustained winds of 80 mph 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 700 mi southwest of the southern tip of Baja California.
 * 1200 UTC (5:00 a.m. PDT) – Tropical Storm Gilma degenerates into a non-convective remnant area of low pressure roughly 680 mi 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 125 mi south-southwest of Manzanillo, Mexico.
 * 1800 UTC (11:00 a.m. PDT) – Tropical Depression Eight-E intensifies into Tropical Storm Hector roughly 180 mi south-southwest of Manzanillo, Mexico.
 * 1200 UTC (5:00 a.m. PDT) – Tropical Storm Hector attains its peak intensity with maximum sustained winds of 50 mph and a minimum barometric pressure of 995 mb (hPa; 29.39 inHg).
 * 1200 UTC (5:00 a.m. PDT) – Tropical Storm Hector weakens to a tropical depression about 495 mi southwest of the southern tip of Baja California.
 * 0000 UTC (5:00 p.m. PDT August 16) – Tropical Depression Hector degenerates into a non-convective remnant area of low pressure roughly 440 mi southwest of the southern tip of Baja California.
 * 1200 UTC (5:00 a.m. PDT) – Tropical Depression Nine-E develops from an area of low pressure about 375 mi south-southwest of Manzanillo, Mexico.
 * 1800 UTC (11:00 a.m. PDT) – Tropical Depression Nine-E intensifies into Tropical Storm Ileana roughly 315 mi south-southwest of Manzanillo, Mexico.
 * 0000 UTC (5:00 p.m. PDT August 29) – Tropical Storm Ileana intensifies into a Category 1 hurricane about 340 mi 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).
 * 1800 UTC (11:00 a.m. PDT) – Hurricane Ileana weakens to a tropical storm roughly 375 mi west-southwest of the southern tip of Baja California.

September
September 2 September 3 September 4 September 12 September 14 September 15 September 16 September 17 September 18 September 19 September 22 September 24 September 25 September 26 September 27 September 28 September 29
 * 0600 UTC (11:00 p.m. PDT September 1) – Tropical Storm Ileana weakens to a tropical depression about 660 mi 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 1,380 mi east-southeast of the Hawaiian Islands.
 * 1200 UTC (5:00 a.m. PDT) – Tropical Storm John develops from an area of low pressure about 230 mi southwest of Manzanillo, Mexico.
 * 0000 UTC (5:00 p.m. PDT September 2) – Tropical Storm John attains its peak intensity with maximum sustained winds of 45 mph and a minimum barometric pressure of 1000 mb (hPa; 29.53 inHg).
 * 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 395 mi west-northwest of the southern tip of Baja California.
 * 0600 UTC (11:00 p.m. PDT September 11) – Tropical Depression Eleven-E develops from an area of low pressure about 175 mi south-southwest of Manzanillo, Mexico.
 * 1200 UTC (5:00 a.m. PDT) – Tropical Depression Eleven-E intensifies into Tropical Storm Kristy roughly 150 mi south-southwest of Manzanillo, Mexico.
 * 0600 UTC (11:00 p.m. PDT September 13) – Tropical Storm Kristy attains its peak intensity with maximum sustained winds of 60 mph and a minimum barometric pressure of 998 mb (hPa; 29.47 inHg).
 * 1200 UTC (5:00 a.m. PDT) – Tropical Depression Twelve-E develops from an area of low pressure about 1,080 mi southwest of Cabo San Lucas, Mexico.
 * 1800 UTC (11:00 a.m. PDT) – Tropical Depression Twelve-E intensifies into Tropical Storm Lane.
 * 1800 UTC (11:00 a.m. PDT) – Tropical Storm Kristy weakens to a tropical depression about 540 mi west-northwest of Cabo San Lucas, Mexico.
 * 0600 UTC (11:00 p.m. PDT September 16) – Tropical Depression Kristy degenerates into a non-convective remnant area of low pressure roughly 625 mi 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 1,170 mi southwest of the southern tip of Baja California.
 * 0000 UTC (5:00 p.m. PDT September 17) – Hurricane Lane attains its peak intensity with maximum sustained winds of 85 mph 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.
 * 0600 UTC (11:00 p.m. PDT September 18) – Tropical Storm Lane degenerates into a non-convective remnant area of low pressure roughly 1,330 mi west-southwest of the southern tip of Baja California.
 * 0000 UTC (5:00 p.m. PDT September 21) – Tropical Depression Thirteen-E develops from an area of low pressure about 415 mi south-southwest of Manzanillo, Mexico.
 * 1200 UTC (5:00 a.m. PDT) – Tropical Depression Thirteen-E intensifies into Tropical Storm Miriam.
 * 0000 UTC (5:00 p.m. PDT September 23) – Tropical Storm Miriam intensifies into a Category 1 hurricane roughly 465 mi 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 120 mph and a minimum barometric pressure of 959 mb (hPa; 28.32 inHg).
 * 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 685 mi west of Manzanillo, Mexico.
 * 0600 UTC (11:00 p.m. PDT September 25) – Hurricane Miriam weakens to a tropical storm.
 * 1800 UTC (11:00 a.m. PDT) – Tropical Storm Miriam degenerates into a non-convective remnant area of low pressure roughly 435 mi west-southwest of the southern tip of Baja California.
 * 0600 UTC (11:00 p.m. PDT September 27) – Tropical Storm Norman develops from an area of low pressure about 115 mi southeast of Cabo San Lucas, Mexico and simultaneously attains its peak intensity with maximum sustained winds of 50 mph and a minimum barometric pressure of 997 mb (hPa; 29.44 inHg).
 * 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 35 mph.
 * 1200 UTC (5:00 a.m. PDT) – Tropical Depression Norman degenerates into a non-convective remnant area of low pressure about 80 mi west-northwest of Los Mochis, Mexico.

October
October 6 October 7 October 9 October 13 October 15 October 16 October 17 October 30 October 31
 * 1200 UTC (5:00 a.m. PDT) – Tropical Depression Fifteen-E develops from an area of low pressure roughly 860 mi 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 880 mi southwest of the southern tip of Baja California.
 * 1200 UTC (5:00 a.m. PDT) – Tropical Storm Olivia attains its peak intensity with maximum sustained winds of 60 mph a minimum barometric pressure of 997 mb (hPa; 29.44 inHg).
 * 0000 UTC (5:00 p.m. PDT October 8) – Tropical Storm Olivia degenerates into a non-convective remnant area of low pressure roughly 885 mi.
 * 1200 UTC (5:00 a.m. PDT) – Tropical Depression Sixteen-E develops from an area of low pressure about 645 mi south-southwest of Cabo San Lucas, Mexico.
 * 1800 UTC (11:00 a.m. PDT) – Tropical Depression Sixteen-E intensifies into Tropical Storm Paul.
 * 0600 UTC (11:00 p.m. PDT October 14) – Tropical Storm Paul intensifies into a Category 1 hurricane roughly 595 mi 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 120 mph and a minimum barometric pressure of 959 mb (hPa; 28.32 inHg).
 * 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 40 mi south-southwest of Cabo San Lazaro, Mexico.
 * 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 30 mi northwest of Cabo San Lazaro, Mexico.
 * 0600 UTC (11:00 p.m. PDT October 29) – Tropical Depression Seventeen-E develops from an area of low pressure about 700 mi 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.
 * 0600 UTC (11:00 p.m. PDT October 30) – Tropical Storm Rosa attains its peak intensity with maximum sustained winds of 50 mph and a minimum barometric pressure of 1001 mb (hPa; 29.56 inHg).

November
November 3 November 30
 * 1200 UTC (5:00 a.m. PDT) – Tropical Storm Rosa weakens to a tropical depression roughly 970 mi 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 990 mi southwest of Cabo San Lucas, Mexico.
 * The 2012 Pacific hurricane season officially ends.