Fleet Numerical Meteorology and Oceanography Center
Professional services
UnclaimedA United States Navy operational center that produces worldwide numerical weather, ocean, satellite, and decision-support information for military operations.
Last updated August 25, 2026
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Overview
The Fleet Numerical Meteorology and Oceanography Center (FNMOC) is a United States Navy operational center headquartered in Monterey, California. It is an echelon IV command aligned under the Naval Meteorology and Oceanography Command, commonly abbreviated as NMOC or CNMOC. Rather than functioning as a conventional consumer-facing brand, FNMOC is a specialized government service organization whose identity is associated with operational meteorology, oceanography, numerical prediction, and the delivery of environmental intelligence to military users. FNMOC supplies worldwide meteorological and oceanographic analysis and forecast products for the United States Navy, the wider Department of Defense, and strategic allies. Its outputs support planning and operations across a broad range of combat platforms and weapons systems, including maritime forces and other systems whose performance, safety, mobility, communications, sensing, and mission planning are affected by atmospheric and ocean conditions. The center combines military and civilian personnel with expertise in meteorology, oceanography, computer science, and fleet operations. The center's historical development began with the Navy Numerical Weather Problems group, established in Suitland, Maryland, in 1958. That organization moved to the Naval Postgraduate School in 1959. A formal Fleet Numerical Weather Facility was established in 1961, and the facility relocated from the Naval Postgraduate School to a standalone site in Monterey in 1974. The operating name Fleet Numerical Meteorology and Oceanography Center was adopted in 1993. In 2005, FNMOC was realigned under the Naval Meteorology and Oceanography Command. A new Computer Operations Center was completed in 2011, reflecting the increasing importance of high-performance computing and continuously updated numerical models. FNMOC's principal technical role is the production and distribution of computer-generated environmental prediction products. Its central modeling capabilities include the Navy Global Environmental Model, or NAVGEM, for global atmospheric prediction, and the Hybrid Coordinate Ocean Model, or HYCOM, for ocean forecasting. The center also supports regional, sub-regional, and specialized atmospheric and oceanographic modeling. Publicly described products include global and regional weather prediction charts, global ensemble weather forecasts, ocean-wave predictions, ensemble wave forecasts, sea-surface temperature and anomaly charts, tropical-cyclone satellite imagery, and current tropical-storm forecast-track information. The center's services are presented through operational products and data systems rather than retail offerings. WXMAP provides weather-prediction chart visualizations, including depictions of NAVGEM output and comparisons with other global numerical weather models. Oceanographic products include wave guidance associated with the WaveWatch III system and ocean analyses generated through systems such as the Navy Coupled Ocean Data Assimilation framework. These products help users assess evolving conditions, uncertainty, and environmental constraints. FNMOC is co-located with the Marine Meteorology Division of the Naval Research Laboratory and maintains close ties with the nearby Naval Postgraduate School. This institutional setting connects operational production with naval research, education, and modeling development. As one of the Department of Defense's primary central production sites for worldwide operational meteorological and oceanographic analysis and forecasts, FNMOC's significance lies in reliability, global coverage, military integration, and the rapid conversion of environmental observations into actionable information.
History
FNMOC traces its institutional origins to the Navy Numerical Weather Problems group, known as NANWEP, which was established in Suitland, Maryland, in 1958. The group was subsequently moved to the Naval Postgraduate School in 1959, placing naval numerical-weather work in proximity to military education and scientific expertise. In 1961, the Navy established the Fleet Numerical Weather Facility, formalizing a dedicated operational capability for computer-assisted weather prediction. The organization later expanded beyond atmospheric forecasting to encompass oceanographic analysis and prediction. In 1974, the Fleet Numerical Weather Facility moved from the Naval Postgraduate School to a standalone location in Monterey, California. Monterey became a significant location for the center because of its relationship with naval research, operational commands, and the Naval Postgraduate School. The site also enabled the facility to develop as a specialized production center rather than simply as an academic or experimental unit. In 1993, the organization adopted the operating title Fleet Numerical Meteorology and Oceanography Center. The revised name reflected the breadth of its mission: operational support for both the atmosphere and the oceans. FNMOC became responsible for producing and distributing a wide range of global, regional, sub-regional, and specialized environmental analyses and forecasts. These products increasingly depended on numerical models, satellite observations, data assimilation, high-performance computing, and automated visualization and dissemination systems. In 2005, Fleet Numerical was realigned under the Naval Meteorology and Oceanography Command. Within that structure, FNMOC operates as an echelon IV command. Its mission is closely connected to the wider naval meteorological and oceanographic enterprise, while its production role distinguishes it as one of the Department of Defense's principal central sites for worldwide computer-generated operational environmental products. The center's technical portfolio includes atmospheric prediction through the Navy Global Environmental Model, or NAVGEM, and ocean prediction through the Hybrid Coordinate Ocean Model, or HYCOM. It also distributes weather and ocean-wave products, ensemble forecasts, sea-surface analyses, tropical-cyclone imagery, and related tactical decision aids. The products are intended to help military users understand current and forecast environmental conditions and incorporate them into operational decisions. FNMOC completed a new Computer Operations Center in 2011. The facility investment underscored the importance of resilient and capable computing infrastructure to a mission that requires the processing of large observational datasets and the generation of frequent global and regional forecasts. FNMOC remains composed of military and civilian specialists in meteorology, oceanography, computer science, and fleet operations. It is co-located with the Naval Research Laboratory's Marine Meteorology Division and maintains close ties with the Naval Postgraduate School, linking operational forecasting with research and education.
- 2011
Computer Operations Center completed
[1]FNMOC completed a new Computer Operations Center supporting its computational production mission.
- 2005
Alignment under Naval Meteorology and Oceanography Command
[1]Fleet Numerical was realigned as an echelon IV command under the Naval Meteorology and Oceanography Command.
- 1993
FNMOC operating title adopted
[1]The organization adopted the name Fleet Numerical Meteorology and Oceanography Center.
- 1974
Relocation to Monterey
[1]The facility moved from the Naval Postgraduate School to a standalone location in Monterey, California.
- 1961
Fleet Numerical Weather Facility established
[1]The Fleet Numerical Weather Facility was formally established as a naval operational weather organization.
- 1959
NANWEP moved to the Naval Postgraduate School
[1]The Navy Numerical Weather Problems group was transferred to the Naval Postgraduate School.
- 1958
Navy Numerical Weather Problems group established
[1]The Navy established the Navy Numerical Weather Problems group in Suitland, Maryland, providing an early institutional foundation for later naval numerical-weather operations.
Products and positioning
A high-reliability military environmental intelligence and numerical prediction center providing worldwide atmospheric and oceanographic products for naval operations, Department of Defense users, and strategic allies.
Global atmospheric numerical prediction model
NAVGEM
The Navy Global Environmental Model is FNMOC's principal global atmospheric prediction capability. Its output supports worldwide weather analysis and forecast products, including chart visualizations used to assess evolving atmospheric conditions. FNMOC also presents NAVGEM depictions through WXMAP, where users can compare Navy model guidance with other global numerical weather prediction systems.
Global ocean prediction model
HYCOM
The Hybrid Coordinate Ocean Model is a central component of FNMOC's ocean-prediction capability. It supports analysis and forecasting of the marine environment across global and regional domains, contributing to operational products used for naval planning and the assessment of ocean conditions.
Weather forecast visualization service
WXMAP
WXMAP provides global and regional weather prediction charts and visualizations. It includes depictions of NAVGEM forecast output and enables side-by-side comparison with other global numerical weather prediction guidance, including products associated with the United States National Weather Service.
Ocean-wave prediction
WaveWatch III products
FNMOC provides global and regional ocean-wave prediction charts based on the WaveWatch III modeling system. These products describe forecast wave conditions across maritime areas and support operational assessments of sea state and navigational or mission-related environmental constraints.
Ensemble ocean-wave prediction
WW3 Ensemble
The WW3 Ensemble offering provides ensemble-based ocean-wave prediction charts. By presenting multiple forecast possibilities, it helps communicate uncertainty in expected wave conditions and supplements deterministic wave guidance.
Ocean analysis
NCODA sea-surface products
FNMOC provides sea-surface temperature and sea-surface anomaly charts associated with Navy ocean data assimilation capabilities. These products provide operational views of marine thermal conditions and their departures from expected or climatological patterns.
Tropical-cyclone information
TCWEB
TCWEB provides links to satellite imagery for tropical cyclones and current tropical-storm forecast-track information. It supports situational awareness of tropical systems relevant to naval and allied operations.
Brand decisions
2011
Completed a new Computer Operations CenterOtherBackground
The center's global numerical prediction mission required substantial computing and operational-production infrastructure.
Action taken
FNMOC completed a new Computer Operations Center.
Aftermath
The new facility supported the center's continuing computational weather and ocean forecasting operations.
2005
Realignment under Naval Meteorology and Oceanography CommandStrategyBackground
Fleet Numerical operated within the Navy's broader meteorological and oceanographic enterprise.
Action taken
The center was realigned under the Naval Meteorology and Oceanography Command as an echelon IV command.
Aftermath
FNMOC continued as a central Department of Defense production site for worldwide operational meteorological and oceanographic products.
1993
Adopted a meteorology and oceanography identityStrategyBackground
The predecessor organization had been known as the Fleet Numerical Weather Facility, while its mission had expanded to include oceanographic prediction and analysis.
Action taken
The operating title was changed to Fleet Numerical Meteorology and Oceanography Center.
Aftermath
The new title formally represented the center's combined atmospheric and oceanographic operational role.
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