The 2009 Pacific hurricane season officially started on May 15 in the East Pacific Ocean, and on June 1 in the Central Pacific; they both ended on November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the Pacific basin. No tropical cyclones formed during the month of May, making 2009 the first time that no tropical cyclones formed during May since 1999. The first tropical cyclone of the year, Tropical Depression One-E, formed June 18, and dissipated the following day. The first named storm of the season, Hurricane Andres formed on June 21. The final storm of the season, Neki, dissipaed on October 27.
This timeline documents all the storm formations, strengthening, weakening, landfalls, extratropical transitions, as well as dissipation.For convenience and clarity, in the timeline below, all landfalls are bolded. The timeline will also include information, when it becomes available, which was not operationally released, meaning that information from post-storm reviews by the National Hurricane Center, such as information on a storm that was not operationally warned on, have been included.
The graphical bar below gives a brief overview of storm activity during the season, and for convenience, the storm's maximum intensity is included as a color bar.
Timeline of events
May
May 15
The 2009 Eastern Pacific hurricane season officially begins.
June
June 1
The 2009 Central Pacific hurricane season officially begins.
June 18
1200 UTC (5:00 pm PDT) – Tropical Depression One-E forms about south-southwest of Mazatlán, Sinaloa.
June 19
0000 UTC (5:00 pm PDT June 18) – Tropical Depression One-E attains its peak intensity of and a barometric pressure of 1003 mbar (hPa; ). 1800 UTC (11:00 pm PDT) – Tropical Depression One-E degenerates into a trough of low pressure near the Mexican coastline.
June 21
1200 UTC (11:00 am PDT) – Tropical Depression Two-E forms about southeast of Acapulco, Mexico. 1800 UTC (5:00 pm PDT) – Tropical Depression Two-E strengthens into Tropical Storm Andres.
June 23
0600 UTC (5:00 am PDT) – Tropical Storm Andres intensifies into a Category 1 hurricane, with winds peaking at , the first of the season while located southwest of Lázaro Cárdenas, Mexico.
June 24
0000 UTC (5:00 am PDT) – Hurricane Andres weakens to a tropical storm. 1200 UTC (5:00 pm PDT) – Tropical Storm Andres weakens to a tropical depression. 1800 UTC (11:00 pm PDT) – Tropical Depression Andres is downgraded to a trough of low pressure shortly before dissipating.
July
July 6
0600 UTC (11:00 pm PDT July 5) – A tropical depression forms about south of Cabo San Lucas, Mexico. 1200 UTC (5:00 am PDT) – The tropical Depression is upgraded to Tropical Storm Blanca.
July 8
1200 UTC (5:00 am PDT) – Tropical Storm Blanca weakens back to a tropical depression.
July 9
0600 UTC (11:00 pm PDT July 8) – Tropical Depression Blanca weakens into a remnant low about west of Cabo San Lucas, Mexico.
July 10
0600 UTC (11:00 pm PDT July 9) – Tropical Depression Four-E forms about south of the southern tip of Baja California. 1800 UTC (11:00 am PDT) – Tropical Depression Four-E strengthens into Tropical Storm Carlos.
July 11
1800 UTC (11:00 am PDT) – Tropical Storm Carlos strengthens into Hurricane Carlos.
July 13
0000 UTC (5:00 pm PDT July 12) – Hurricane Carlos weakens to a tropical storm.
July 14
1200 UTC (5:00 am PDT) – Tropical Storm Carlos re-strengthens back into a Category 1 hurricane.
July 15
0000 UTC (5:00 pm PDT July 14) – Hurricane Carlos reaches Category 2 intensity. 0000 UTC (5:00 pm PDT July 14) – Tropical Depression Five-E forms west-southwest of Manzanillo, Mexico. 1200 UTC (5:00 am PDT) – Tropical Depression Five-E strengthens into Tropical Storm Dolores. 1800 UTC (11:00 am PDT) – Hurricane Carlos is downgraded to a tropical storm.
July 16
0600 UTC (11:00 pm PDT July 15) – Tropical Storm Carlos weakens to a tropical depression. 1800 UTC (11:00 am PDT) – Tropical Storm Dolores degenerates into a remnant low.
July 17
0000 UTC (5:00 pm PDT July 16) – Tropical Depression Carlos dissipates.
July 30
1200 UTC (8:00 am PDT) – Tropical Depression Six-E forms east-southeast of Hilo, Hawaii. 1800 UTC (8:00 am HST) – Tropical Depression Six-E enters the Central Pacific Hurricane Center's area of responsibility and is upgraded to Tropical Storm Lana east-southeast of Hilo, Hawaii.
August
August 2
1800 UTC (8:00 am HST) – Tropical Storm Lana weakens to a tropical depression.