stated on the page: nomads.ncep.noaa.gov

--- title: GFS (NOAA/NCEP) summary: The Global Forecast System: the United States' global model, four runs a day, outputs in the public domain. mount:

Models

Left: what points at it. Right: what it points at. Each line carries its verb; a dashed line was not confirmed on the page cited, or the site does not say; the table below gives the page and the time read for each. From model-gfs.json

--- # GFS (NOAA/NCEP) > Kept by incident.meteorology@web-summit.dinis, 11 November 2026, 11:36 UTC [Where a forecast comes from](../index.md) · Models · id `model-gfs` · [as data](model-gfs.json) The Global Forecast System: the United States' global model, four runs a day, outputs in the public domain. **Address:** [https://www.emc.ncep.noaa.gov/emc/pages/numerical_forecast_systems/gfs.php](https://www.emc.ncep.noaa.gov/emc/pages/numerical_forecast_systems/gfs.php) (leaves this site) ## What it is connected to, and who says so | This | Verb | That | The page that says so | Read | Check | |---|---|---|---|---|---| | GFS (NOAA/NCEP) | **assimilates** | [Radiosondes (weather balloons)](obs-radiosondes.md) | [ncei.noaa.gov](https://www.ncei.noaa.gov/products/weather-climate-models/global-data-assimilation): "binary Output Data Format World Meteorological Organization (WMO) Gridded Binary (GRIB) Observation Types Surface Balloon Wind Profiler Aircraft Reports Buoy Radar Satellite Related News May 20, 2026 Rhode Island Receive" *The GFS starts from GDAS, the Global Data Assimilation System.* | 11:28 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **assimilates** | [JPSS and NOAA polar orbiters](obs-jpss.md) | [ncei.noaa.gov](https://www.ncei.noaa.gov/products/weather-climate-models/global-data-assimilation): "Products Product Grid/Scale Period of Record Model Cycle Output Timestep Data Access Links GDAS Snow, Ice, SST, Satellite, Ship, Aircraft (GRIB and BUFR) 1°x1° 0.5°x0.5° 0.25°x0.25° 01Jan2001–Present (approx. one year to" | 11:28 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **assimilates** | [Surface weather stations (SYNOP)](obs-surface-stations.md) | [ncei.noaa.gov](https://www.ncei.noaa.gov/products/weather-climate-models/global-data-assimilation): "(IEEE) binary Output Data Format World Meteorological Organization (WMO) Gridded Binary (GRIB) Observation Types Surface Balloon Wind Profiler Aircraft Reports Buoy Radar Satellite Related News May 20, 2026 Rhode Island " | 11:28 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **assimilates** | [Aircraft reports (AMDAR)](obs-aircraft.md) | [ncei.noaa.gov](https://www.ncei.noaa.gov/products/weather-climate-models/global-data-assimilation): "Grid/Scale Period of Record Model Cycle Output Timestep Data Access Links GDAS Snow, Ice, SST, Satellite, Ship, Aircraft (GRIB and BUFR) 1°x1° 0.5°x0.5° 0.25°x0.25° 01Jan2001–Present (approx. one year to present online) " | 11:28 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **is what NOAA NOMADS (NCEP model output) carries** | [NOAA NOMADS (NCEP model output)](data-noaa-nomads.md) | [nomads.ncep.noaa.gov](https://nomads.ncep.noaa.gov/): "the column headings for description of each data access method. Data Set freq grib filter https Global Models AIGFS 6 hours - https AIGEFS 6 hours - https GDAS 6 hours grib filter https GDAS 0.25 6 hours grib filter http" | 11:29 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **redistributed by** | [Open-Meteo](data-open-meteo.md) | [open-meteo.com](https://open-meteo.com/en/docs/gfs-api): "GFS & RRFS API / Open-Meteo.com Open-Meteo Home Features Pricing API Docs Animations GitHub X Toggle theme GFS & RRFS Forecast API Global GFS model combined with 3-km RRFS" | 11:29 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **redistributed by** | [Pirate Weather](site-pirateweather.md) | [docs.pirateweather.net](https://docs.pirateweather.net/en/latest/): "This API is designed to be a drop in replacement/ alternative to the Dark Sky API, and as a tool for assessing GFS, HRRR and NBM forecasts via a JSON API. This solves two goals: It will also allow legacy applications to " | 11:29 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **run by** | [NOAA (NWS, NCEP, NESDIS)](body-noaa.md) | [emc.ncep.noaa.gov](https://www.emc.ncep.noaa.gov/emc/pages/numerical_forecast_systems/gfs.php): "22, 2021: Implementation of GFS Version 16 in the NCEP Production Suite: GFS v16 Official Evaluation Page The Global Forecast System (GFS) is the cornerstone of NCEP's suite of numerical guidance, providing global atmosp" | 11:29 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **visualised by** | [Windy](site-windy.md) | [community.windy.com](https://community.windy.com/topic/12/what-source-of-weather-data-windy-use): "lat/lon (~9 km). The forecast output is produced every three hours for first 144 hours, six hourly through day 10. GFS (Global Forecast System) - the model is operated by the United States' National Weather Service (NWS)" | 11:29 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **visualised by** | [Ventusky](site-ventusky.md) | [ventusky.com](https://www.ventusky.com/about): "Satellite Wind speed Wind gusts Clouds Air pressure CAPE Snow cover Humidity Sea Air quality Wind Animation ECMWF, GFS, ICON, GEM Two New High-Resolution Weather Models on Ventusky About us About us Data sources Help Con" | 11:29 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **visualised by** | [earth.nullschool.net](site-nullschool.md) | [earth.nullschool.net](https://earth.nullschool.net/about.html): "data produced by scientists and engineers at government agencies and research labs across the globe Weather Data GFS (Global Forecast System) EMC / NCEP / NWS / NOAA Ocean Currents Data OSCAR v2.0 Earth & Space Research " | 11:29 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **visualised by** | [Meteociel](site-meteociel.md) | [meteociel.fr](https://www.meteociel.fr/modeles/gfse_cartes.php): "Meteociel - Cartes du mod�le num�rique GFS pour l'Europe Accueil - 11076 visiteurs Menu Utilisateur Inscription Se connecter Meteociel Android Meteociel iOS H�berger image Forums Meteociel Tchat m�t�o (4) Temps" | 11:29 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **visualised by** | [Wetterzentrale](site-wetterzentrale.md) | [wetterzentrale.de](https://www.wetterzentrale.de/en/default.php): "Home page wetterzentrale.de Toggle navigation Top Karten Global models GFS ECMWF UKMO GEM ICON ARPEGE NAVGEM JMA Regional models WRF ICON D2 HARMONIE AROME ALARO IRIE Data-driven models AIFS AIGFS GraphCastGEM Other 9-pa" | 11:29 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **visualised by** | [Tropical Tidbits](site-tropicaltidbits.md) | [tropicaltidbits.com](https://www.tropicaltidbits.com/analysis/models/): "Tidbits Nov 3: NCEP has retired NAM and HiresW mesoscale models , replacing them with RRFS and the REFS Ensemble GFS Run Time: 06Z Nov 11 Global ECMWF EC-AIFS GFS AIGFS CMC ICON JMA Ensemble EPS AIFS-ENS GEFS GEPS Hurric" | 11:29 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **visualised by** | [Windguru](site-windguru.md) | [windguru.cz](https://www.windguru.cz/help.php?sec=models): "large-scale weather patterns such as jet streams, tropical storms, or systems crossing continents. Examples include GFS (Global Forecast System) and ICON. Local models, on the other hand, focus on smaller geographic area" | 11:29 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **visualised by** | [MeteoPT](site-meteopt.md) | [meteopt.com](https://www.meteopt.com/): "MeteoPT.com Comunidade de Meteorologia Português Español English menu_home menu_forum menu_models menu_global GFS ECMWF AIGFS ECMWF-AIFS UKMO ICON ARPÈGE menu_comparator menu_ensemble GEFS ECMWF ENS menu_observation menu" *The models menu of the community's home page.* | 11:30 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **is what Weather Underground takes as forecast input** | [Weather Underground](site-wunderground.md) | [wunderground.com](https://www.wunderground.com/about/data): "Pressure Temperature Cloud Cover Humidity Chance of Precipitation Dew Point Forecast input A variety of inputs, including, but not limited to, ECMWF, GFS, and NAM Mostly NAM and GFS Sky Conditions Uses radar and satellit" *Listed as "forecast input" to its own system, BestForecast.* | 11:30 UTC, 11 Nov | stated on the page | | GFS (NOAA/NCEP) | **informs warning by** | [US National Hurricane Center](svc-nhc.md) | [nhc.noaa.gov](https://www.nhc.noaa.gov/modelsummary.shtml): "tropical cyclone (TC) along based on the prevailing flow obtained from a separate dynamical model (either the GFS or the ECMWF). Super Intelligence/Machine Learning (SI/ML) models are trained on reanalysis outputs from d" | 11:30 UTC, 11 Nov | stated on the page | ## Licence: what we may do with it **NOAA / US National Weather Service (GFS, NOMADS, Aviation Weather Center, NHC)**: US government work: public domain ([weather.gov](https://www.weather.gov/disclaimer), read 11:30 UTC, 11 Nov, stated on the page). | Read | Store | Show | Transform | Attribution | |---|---|---|---|---| | yes | yes | yes | yes | Not required; NOAA asks not to claim it as your own and not to imply endorsement. We credit "NOAA/NWS". | Do not present modified data as official NWS information. --- Not a warning service: this page explains where data comes from. For warnings follow [IPMA](https://www.ipma.pt/pt/otempo/prev-sam/) and ANEPC.