Eastern Pacific hurricane season

Eastern Pacific hurricane season
Name	Eastern Pacific hurricane season
Basin	Eastern Pacific
First storm formed	May/June
Last storm dissipated	November/December
Strongest storm	Varied by year
Total storms	Variable
Fatalities	Variable
Damages	Variable

Contents

Eastern Pacific hurricane season The Eastern Pacific hurricane season is the annual period when cyclonic storms typically develop in the northeastern section of the Pacific Ocean off the coasts of Mexico, the Baja California Peninsula, and Central American states such as Guatemala and El Salvador. It interacts with large-scale climate modes including El Niño–Southern Oscillation and Pacific Decadal Oscillation, and affects regional actors like the National Hurricane Center, the Servicio Meteorológico Nacional, and international agencies including the World Meteorological Organization and United Nations Office for Disaster Risk Reduction. Historical records kept by institutions such as the National Oceanic and Atmospheric Administration and the Central Pacific Hurricane Center underpin operational practice and scientific study.

Overview

The Eastern Pacific season contributes significantly to global tropical cyclone activity and is monitored by organizations including the National Hurricane Center, NOAA, Servicio Meteorológico Nacional, and regional centers such as the Central Pacific Hurricane Center and the Joint Typhoon Warning Center. Seasonal variations link to teleconnections like El Niño and La Niña, and to oceanic features studied by programs such as the Tropical Atmosphere–Ocean Project and the Argo program. The region’s oceanography ties into research by institutions like the Scripps Institution of Oceanography and the Woods Hole Oceanographic Institution, while impacts mobilize agencies such as FEMA and the Red Cross.

The official season spans dates set by the National Oceanic and Atmospheric Administration and recognized by the World Meteorological Organization; most operational definitions mark a start in late spring and an end in late autumn, overlapping with the Atlantic hurricane season. Geographical boundaries separate the Eastern Pacific basin from the Central Pacific (near the International Date Line) and the Atlantic basin at the Isthmus near Central America and the Gulf of Tehuantepec. The season’s climatological peak and genesis regions are described in products produced by the National Hurricane Center and regional meteorological services such as Servicio Meteorológico Nacional.

Storm genesis in the Eastern Pacific often occurs from disturbances like easterly waves that originate near the Sahara Desert region and traverse the Caribbean Sea, or from tropical upper-tropospheric troughs analyzed in research by the American Meteorological Society and the Geophysical Research Letters community. Conditions that favor development include warm sea surface temperatures observed by NOAA satellites, low vertical wind shear monitored by the European Centre for Medium-Range Weather Forecasts, and sufficient mid-level humidity measured by campaigns from the National Oceanic and Atmospheric Administration and the Naval Research Laboratory. Rapid intensification events are investigated in field programs such as the Hurricane Field Program and the PERSIST projects involving the National Aeronautics and Space Administration. Interactions with topography such as the Sierra Madre Occidental and the Baja California Peninsula modulate storm tracks and rainfall distribution, which are subjects of study at universities including the University of California, San Diego and Universidad Nacional Autónoma de México.

Historical databases compiled by NOAA and the National Hurricane Center document storms including notorious systems that impacted Mexico, Hawaii, and Central American nations. Landmark events appear in literature alongside studies from the American Geophysical Union and the Bulletin of the American Meteorological Society. Notable storms studied across disciplines include those that caused significant loss and prompted policy responses by national governments and multilateral organizations such as the Inter-American Development Bank. Paleotempestology and reanalysis efforts by researchers at institutions like the University of Miami and the University of Oxford continue to refine the record, while operational changes have been influenced by major events cataloged by the World Meteorological Organization and the International Federation of Red Cross and Red Crescent Societies.

Impacts span coastal inundation, flash flooding, and landslides that affect urban centers such as Acapulco, Manzanillo, and ports along the Gulf of California, as well as rural communities in states like Oaxaca and Chiapas. Preparedness and response involve collaboration among agencies including FEMA, Civil Protection (Mexico), the Red Cross, and national meteorological services. Measures include early warning systems operated by the National Hurricane Center, emergency management protocols aligned with the Sendai Framework for Disaster Risk Reduction, infrastructure resilience projects funded by entities such as the World Bank and the Inter-American Development Bank, and community outreach by organizations like Médecins Sans Frontières and national disaster relief agencies.

Operational monitoring uses satellites from programs like the Geostationary Operational Environmental Satellite series, scatterometer data from missions such as ASCAT, and reconnaissance contributions via aircraft used in coordination with agencies including NOAA and the United States Air Force Reserve. Forecasting blends numerical models from the European Centre for Medium-Range Weather Forecasts, the Global Forecast System, and regional ensemble systems maintained by research centers such as the National Hurricane Center and university groups at Florida State University and Colorado State University. Warning dissemination leverages networks including national meteorological services, emergency management agencies, and media organizations such as Televisa and public broadcasters, along with international coordination through the World Meteorological Organization.

Category:Pacific hurricanes