Servicio Nacional de Meteorología e Hidrología (SENAMHI)

Servicio Nacional de Meteorología e Hidrología (SENAMHI)
Name	Servicio Nacional de Meteorología e Hidrología
Formed	1979
Preceding1	Dirección Meteorológica del Perú
Jurisdiction	Peru
Headquarters	Lima
Parent agency	Ministry of the Environment (Peru)

Servicio Nacional de Meteorología e Hidrología (SENAMHI) is the national meteorological and hydrological service of Peru, responsible for weather forecasting, hydrological monitoring, climate research, and hazard warnings. It operates under the aegis of the Ministry of the Environment (Peru) and interfaces with international bodies, regional agencies, and domestic institutions to support sectors such as agriculture, aviation, water resources, and disaster risk reduction. SENAMHI's mandate encompasses observational networks, data assimilation, numerical modelling, and dissemination of advisories to government entities including the National Civil Defense Institute.

History

SENAMHI traces institutional antecedents to the 19th century when maritime and observational needs in Callao and Lima led to early synoptic stations linked to global efforts such as the International Meteorological Organization. The formal establishment in 1979 consolidated prior services including the Dirección Meteorológica del Perú and integrated hydrological functions previously dispersed across ministries. Throughout the late 20th century SENAMHI expanded during pivotal events such as the 1982–83 and 1997–98 El Niño episodes, prompting modernization of networks and cooperative projects with organizations like the World Meteorological Organization and the Intergovernmental Panel on Climate Change. Institutional reforms in the 2000s aligned SENAMHI with regional initiatives from the Andean Community and national policy frameworks influenced by the United Nations Office for Disaster Risk Reduction.

Organization and Structure

SENAMHI is organized into technical directorates and regional offices to reflect Peru's physiographic diversity from the Pacific Ocean coast through the Andes to the Amazon Basin. Core units include directorates for Meteorology, Hydrology, Climatology, and Technical Services, supported by administrative, IT, and training divisions. Regional centers cover administrative departments such as Lima Region, Arequipa, Cusco, and Loreto to maintain proximal services for stakeholders including the Peruvian Armed Forces for aviation meteorology and the Ministry of Agriculture and Irrigation (Peru) for agro-hydrological applications. Governance integrates advisory councils with representatives from institutions like the National Institute of Health (Peru) for health-climate interfaces and the National Water Authority (Peru) for basin management.

Functions and Services

SENAMHI provides operational forecasts, hydrological bulletins, climatological normals, and specialized products for sectors such as aviation, shipping, agriculture, and disaster management. Regular outputs include synoptic charts, daily meteorological forecasts for urban centers such as Lima, seasonal climate outlooks related to El Niño–Southern Oscillation, flood risk assessments for basins including the Rímac River and the Ucayali River, and drought monitoring for the Ica Region. The agency issues alerts used by the National Civil Defense Institute and municipal authorities during extreme events like coastal inundation, riverine flooding, and orographic precipitation leading to landslides in regions such as Ancash and Puno. SENAMHI also provides climatological data to research institutions including the National Agrarian University La Molina and to international initiatives such as the Global Framework for Climate Services.

Observational Network and Infrastructure

SENAMHI operates an integrated network of surface weather stations, automatic weather stations, river gauge stations, radar installations, and upper-air sounding sites. Key infrastructure includes meteorological radars serving the Lima metropolitan area, automated hydrometric stations across watersheds like the Marañón River, and radiosonde launches coordinated with regional centres comparable to networks in Bolivia and Chile. Data management systems implement metadata standards encouraged by the World Meteorological Organization for interoperability with global observing systems such as the Global Observing System and the Global Telecommunication System. Partnerships with airports including Jorge Chávez International Airport facilitate aeronautical meteorology, while collaborative sensor deployments in the Amazon Rainforest support ecological and hydrological research.

Research and Development

SENAMHI undertakes applied research in numerical weather prediction, hydrological modelling, climate variability, and impact assessment. Research collaborations have linked SENAMHI scientists with universities like the Pontifical Catholic University of Peru and international centers including the National Oceanic and Atmospheric Administration and the European Centre for Medium-Range Weather Forecasts. Projects address topics such as downscaling of global climate projections for the Andean region, development of flood forecasting models for transboundary basins involving Ecuador and Brazil, and evaluation of climate change impacts consistent with assessments from the Intergovernmental Panel on Climate Change. Capacity-building programs include training with the Pan American Health Organization on climate-sensitive health risks.

Forecasting and Warning Systems

SENAMHI issues multi-timescale forecasts—nowcasts, short-range, medium-range, and seasonal outlooks—using numerical models, statistical methods, and assimilation of regional observations. Warning products are tiered for hazard levels and disseminated through media partners including national television, municipal emergency services, and digital platforms aligned with the National Emergency Operations Center. The agency employs model ensembles and collaborates on regional prediction systems used across the Andean Community and by meteorological services in Chile, Colombia, and Ecuador to improve skill for phenomena such as convective storms and coastal upwelling events affecting fisheries near Pisco. Evaluation frameworks reference standards from the World Meteorological Organization and peer reviews by institutions like the United Nations Development Programme.

International Cooperation and Partnerships

SENAMHI maintains strategic partnerships with the World Meteorological Organization, National Oceanic and Atmospheric Administration, European Centre for Medium-Range Weather Forecasts, regional services in South America, and multilateral programs including the Global Framework for Climate Services and the Amazon Cooperation Treaty Organization. Bilateral cooperation agreements support technology transfer, joint field campaigns in the Andes and the Amazon Basin, and capacity building through fellowships with universities such as the University of Cambridge and research centers like the International Research Institute for Climate and Society. Participation in transnational initiatives enhances interoperability of data systems with the Global Telecommunication System and enables contributions to global climate assessments including reports by the Intergovernmental Panel on Climate Change.

Category:Meteorological agencies Category:Hydrology