2009 Pacific hurricane season

Meteorological characteristics

Storm formation in the eastern and central North Pacific is governed by sea-surface temperatures, vertical wind shear, and large-scale atmospheric patterns such as the Madden–Julian Oscillation and phases of El Niño–Southern Oscillation. In 2009, conditions supported the development of several organized systems that underwent rapid intensification. Tropical cyclones in the eastern Pacific typically move westward away from the Mexican coast, but some recurved or tracked close enough to produce heavy rain, high surf, and localized damage.

Notable storms and impacts

Two storms from 2009 drew heightened attention. Hurricane Rick became one of the most intense hurricanes observed in the eastern Pacific at the time, reaching very high sustained winds and very low central pressure during its peak intensity. Separately, Hurricane Jimena made landfall and caused significant damage along the Baja California peninsula; estimates of economic loss exceeded tens of millions of dollars. Jimena’s impacts included flooding, infrastructure damage, and coastal erosion in parts of Baja California.

Monitoring, naming and records

Storms in this basin were tracked and analyzed by the U.S. National Hurricane Center (NHC) and, for systems entering the central Pacific, the Central Pacific Hurricane Center (CPHC). Each tropical cyclone received a name from the rotating list assigned before the season. Intensity records are evaluated post-season through reanalysis of satellite data and available observations, and outstanding storms from 2009 were added to long-term Eastern Pacific records of intense hurricanes.

Importance and historical context

Although not the most active season on record, 2009 illustrates key behavior of eastern Pacific tropical cyclones: occasional rapid intensification, potential for strong hurricanes that remain offshore, and the risk of damaging landfalls along Mexico’s Pacific coast and Baja California. The season contributes to climatological studies that help improve forecasting of storm genesis, intensity changes, and coastal impacts in the region.

• Season dates: May 15–November 30 (eastern Pacific).
• Total named storms: 12 (including several hurricanes and multiple major hurricanes).
• Primary agencies: NHC and CPHC.