Pacific hurricane season

Pacific hurricane season
Basin	Pacific
First storm formed	varies
Last storm dissipated	varies
Strongest storm name	varies
Total storms	varies
Fatalities	varies
Damages	varies

Pacific hurricane season.

The Pacific hurricane season refers to the annual period when tropical cyclones form in the northeastern and central Pacific Ocean basins adjacent to North America and Central America. It is governed by large-scale climate modes such as El Niño–Southern Oscillation, influenced by oceanic and atmospheric interactions near Equatorial Pacific, and monitored by agencies including the National Hurricane Center, Central Pacific Hurricane Center, and national meteorological services of Mexico, Guatemala, and El Salvador.

Overview

The season conventionally runs from May 15 in the eastern Pacific Ocean and from June 1 in the central Pacific Ocean through November 30, with peak activity in late summer and early autumn influenced by the Intertropical Convergence Zone, sea surface temperature anomalies, and the position of the Pacific subtropical ridge. Tropical cyclones in this basin are classified into depressions, storms, and hurricanes by the Saffir–Simpson scale and are tracked with advisories issued by the National Hurricane Center and the Central Pacific Hurricane Center, which coordinate with the National Oceanic and Atmospheric Administration, the World Meteorological Organization, and regional forecasting centers in Mexico and Hawaii.

Seasonal patterns and climatology

Seasonal variability is modulated by the El Niño–Southern Oscillation, where El Niño typically enhances eastern and central Pacific activity by warming sea surface temperatures and reducing vertical wind shear, while La Niña tends to suppress activity. Multidecadal variability associated with the Pacific Decadal Oscillation and teleconnections such as the Madden–Julian Oscillation also alter genesis frequency and track patterns. Ocean heat content, monitored near Hawaii, the Gulf of California, and the coastal waters off Mexico, combines with atmospheric moisture from the ITCZ and the presence of easterly waves propagating from the African continent or the Caribbean Sea to seed system development.

Monitoring and forecasting

Operational monitoring employs geostationary satellites such as GOES series and polar-orbiting platforms, scatterometer missions like QuikSCAT legacy products, and microwave sensors on Tropical Rainfall Measuring Mission and Global Precipitation Measurement satellites to estimate wind and precipitation structure. Reconnaissance is limited compared with the Atlantic hurricane season, but targeted aircraft operations have included missions by the NOAA Hurricane Hunters into the Central Pacific and coordination with the United States Air Force Reserve in shared campaigns. Numerical weather prediction uses global models such as the GFS, ECMWF, and regional hurricane models like the HWRF and HWRF Ensemble combined with statistical-dynamical tools developed by the National Hurricane Center and research by institutions including Scripps Institution of Oceanography and NOAA's Atlantic Oceanographic and Meteorological Laboratory.

Impact and preparedness

Impacts include storm surge along the coasts of Mexico, heavy rainfall and inland flooding in Guatemala and El Salvador, and high surf and coastal erosion affecting Hawaii and Pacific islands like Johnston Atoll. Preparedness frameworks involve national civil protection agencies such as Mexico’s Protección Civil and regional emergency operations centers, coordination with United Nations Office for the Coordination of Humanitarian Affairs, and infrastructure resilience programs funded through institutions like the World Bank and the Inter-American Development Bank. Evacuation planning leverages local authorities in port cities such as Acapulco, Mazatlán, and Manzanillo, while maritime advisories involve the United States Coast Guard and port authorities across Central America.

Notable seasons and storms

Historic and impactful systems include the 1997 season influenced by El Niño which produced Hurricane Linda (1997), Hurricane Pauline (1997) that struck Mexico, and Hurricane Paka (1997) affecting Guam and American Samoa. Other significant seasons include 2015 with Hurricane Patricia (2015), the strongest recorded in terms of maximum sustained winds in the basin affecting Jalisco and Oaxaca, and 2014 with anomalous tracks such as Hurricane Odile (2014) impacting Baja California Sur and La Paz, Baja California Sur. Earlier notable storms include Hurricane Kenna (2002), Hurricane Manuel (2013), and Hurricane Ioke (2006) which affected remote Johnston Island and prompted international response coordination with agencies like the Federal Emergency Management Agency and Mexican Red Cross.

Records and statistics

Climatological records are kept by the National Hurricane Center, Central Pacific Hurricane Center, and research centers at NOAA and NASA. Records include extremes such as highest sustained winds (Hurricane Patricia (2015)), lowest central pressure (Hurricane Wilma is an Atlantic example for baseline comparison though pressure extremes in the Pacific include Hurricane Ioke (2006)), and season totals that vary with El Niño events and the Pacific Decadal Oscillation. Statistical analyses published by institutions like Scripps Institution of Oceanography, University of Miami research groups, and CICESE quantify trends in landfall frequency, storm intensity, and accumulated cyclone energy, informing adaptation and mitigation policy discussions with agencies such as NOAA's Climate Program Office.

Category:Tropical cyclone climatology