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NOMADS Data Access
NOMADS Data Access by Provider and Data Type
IntroductionThis web site provides access to the model data repository at NCDC. This repository contains both archived (i.e., off-line) and on-line model data. We provide a variety of ways to access our weather and climate model data. You can access the on-line data using traditional access methods (web-based or ftp), or you can use open and distributed access methods promoted under the collaborative approach called the NOAA Operational Model Archive and Distribution System (NOMADS). With the NOMADS Web Interface you can create, display, and download plots, use ftp to download parameters and files, and use the NOMADS Distributed Data Server using OPeNDAP and the GrADS Data Server (GDS) to access the data directly from your preferred client or desktop. You can also perform remote calculations using scripts under the GDS. To see what datasets we have available, first vist the NCDC Model Data Inventories section to locate datasets of interest and view dataset documentation. After you determine which datasets you want to further explore, visit the Data Access Guide page and learn about the different access methods and features provided. To browse the inventories, directly read and analyze data, or retrieve model data visit the sections below. The following access functions are provided.
NCEP High Resolution Global Forecast System (1 degree GFS), North American Mesoscale (12km NAM), and Rapid Update Cycle (20km RUC)The table below lists the weather model datasets we have on-line or archived at NCDC. Each entry in the table below provides you links to access methods for that dataset. See the Section Above for descriptions of these access methods. Note: These data may be delayed up to one day. For real-time access go to the NCEP R/T NOMADS.
NCEP Climate Forecast System version 2The Climate Forecast System (CFS) is a fully coupled model representing the interaction between the Earth's oceans, land and atmosphere. This model became operational in August 2004, and has been run in retrospective mode back 25 years to 1981. Users seeking access to CFS archived and real-time data should visit the National Centers for Environmental Prediction's CFS homepage. Available on the site are retrospective daily and monthly data, climatologies, links to operational CFS model runs, CFS documentation, news, and other products. Notices concerning the CFSR data: Reanalysis
Recommended acknowledgment for this dataset:
Saha, Suranjana, and Coauthors, 2010:
The NCEP Climate Forecast System Reanalysis.
Bull. Amer. Meteor. Soc., 91, 1015.1057.
doi: 10.1175/2010BAMS3001.1
Additional information about the CFSR:
Notice to users who downloaded CFSR Time Series data prior to 22:00 UTC February 18, 2010:
A format conversion issue was verified affecting the metadata in
non-instantaneous CFSR time series files (28 of the 73 file types affected
are listed below). The issue, triggered during the conversion process
between GRIB1 to GRIB2 by NCEP (to facilitate transmission and storage),
caused the non-instantaneous fields (0-1, 1-2, 2-3 hr statistical) to
appear instantaneous (0-0, 1-1, 2-2 hr statistical) when decoded. At
22:00 UTC February 18 2010, NCDC will begin bringing corrected
versions of these files online. Users who have already downloaded these
files are encouraged to re-download these files on/after Friday, February
19th, otherwise be aware of these facts when using your existing copy. If
you improvise the metadata, the data itself is valid.
dlwsfc dswsfc gflux lhtfl ocndt20c ocnheat ocnmld ocnsal15 ocnsal5 ocnslh ocnsst ocnt15 ocnu15 ocnu5 ocnv15 ocnv5 ocnvv55 prate runoff shtfl snohf tmax tmin ulwsfc ulwtoa uswsfc uswtoa wndstrs Climate Forecast System Reanalysis
Climate Forecast System Initial ConditionsClimate Forecast System Initial Conditions
For a complete schedule of CFSR availability, please see:
Reanalysis Access Schedule
ReforecastA complete Reforecast of CFS version 2, over the 29-year period (1982-2010) has been created in order to provide stable calibration and skill estimates of the new system, for operational seasonal and sub seasonal prediction at NCEP. Coupled full 9-month forecasts from initial conditions every 5 days apart (for all 4 c cycles on that day) have been made for each calendar year with the T126L64 GFS with half-hourly coupling to the ocean (MOM4 at 1/4° equatorial, 1/2° global). Total number of 9-month forecasts is 73x4 for each year, amounting to 8468 forecast runs for the full period. In addition to the 9-month runs, there is a full season run from every 0Z cycle over a 12-year period (1999-2010) for a total of 4380 runs. There is also a short 45-day forecast from every 6Z, 12Z and 18Z cycle over the same 12-year period (1999-2010) for a total of 13140 runs. Reference the following article (to be submitted) when using the CFS version 2 Reforecast model or data:
Suranjana Saha, Shrinivas Moorthi, Xingren Wu, Jiande Wang,
Sudhir Nadiga, Patrick Tripp, Hua-Lu Pan, David Behringer,
Yu-Tai Hou, Hui-ya Chuang, Mark Iredell, Michael Ek, Jesse Meng,
Rongqian Yang, Huug van den Dool, Qin Zhang, Wanqiu Wang, Mingyue Chen,
2011: The NCEP Climate Forecast System Version 2.
[ To be submitted to
The Journal of Climate ]
Notice 12/02/2011: NCDC and NCEP have identified that the "High-priority Reforecast" data sets are roughly 99% serially complete at this time and may contain isolated damaged files. ♠ Climate Forecast System Reanalysis and Reforecast
For a complete schedule of CFS Reforecast availability, please see:
Reforecast Access Schedule
♠ Not serially complete at this time. ‡ notice: Please be aware of digital signature (MD5) files. (read more). NCEP North American Regional Reanalysis (32km, 25 years)Documentation
NARR fields use Earth relative winds, which do not need adjustment when used with GrADS and GDS.
Monthly Means:
NCEP GFS Ensemble ProbabilitiesThe following interfaces are testbed capabilities to multiple members of the NCEP Ensembles run under the Global Forecast System. These interfaces allow user selectable flow-dependant probabilities predictions of several meteorological sensible weather elements. These pages are in development. Please report feedback to NOMADS.ncdc@noaa.gov.
NCDC Climate DatasetsBelow are several operational data sets provided by the NCDC and NOMADS.
NODC AVHRR Pathfinder Version 5.0 SST DatasetThe 4 km AVHRR Pathfinder Version 5.0 SST Project (Pathfinder V5) is a new reanalysis of the AVHRR data stream developed by the University of Miami's Rosenstiel School of Marine and Atmospheric Science (RSMAS) and the NOAA National Oceanographic Data Center (NODC). This reprocessing uses an improved version of the Pathfinder algorithm and processing steps to produce twice-daily global SST and related parameters back to 1985, at a resolution of approximately 4 km, the highest possible for a global AVHRR data set. Temporal averages for 5-day, 7-day, 8-day, Monthly, and Yearly periods are also produced. Current key improvements over the original 9 km Pathfinder SST data set include a more accurate, consistent land mask, higher spatial resolution, and inclusion of sea ice information. Other improvements are under development and will be implemented in the next reprocessing, which will commence in mid-2004.
NCEP Model GDAS Assimilation Dataset (in BUFR & GRIB format)Below are several operational data sets provided by the NCDC and NOMADS.
Please see NCEP (Keyser) for
additional background information on GDAS and other NCEP models.
Also visit: EMC/Mesoscale Modeling Branch Publication Listing.
We will be adding plotting and ftp capabilities as programs are completed.
Climate Model DatasetsThrough the NOMADS Collaboration, model output and documentation from a set of multi-century experiments performed using GFDL's CM2.0 and CM2.1 global climate models are being made available at GFDL's NOMADS Data Portal. Datasets are available at their GFDL CM2.x Coupled Climate Models page. The Community Data Portal (CDP) is a collection of earth science datasets from NCAR, UCAR, UOP, and participating organizations in the following research areas:
Paleoclimate DatasetsThe paleoclimate model data sets available here are derived primarily from climate model experiments associated with peer reviewed scientific publications. The archive includes many of the experiments performed as part of the Paleoclimate Model Intercomparison Project (PMIP), plus other, PMIP-like experiments. Also included here are other model runs such as transient simulations of the past 1,000 years, and some data sets related to model forcing and model boundary conditions. Additional information on paleoclimate model data sets, including tools to access and plot model data and a web form to search for data, are available on the paleoclimate modeling page.
Paleoclimate model output on NOMADS GrADS Data Server
National Digital Forecast DatabaseNDFD
NCDC NOMADS provides access to NCDC's archive of the National
Weather Service
National Digital Forecast Database
(NDFD).
Prior to October 06 2008, access is provided through the
offline request system,
limited to one day at a time due to the size and processing required.
NCDC HAS access is recommended for users wanting to obtain many days of NDFD data - however -
you will need to work with the raw/bulky archive units on your own, so start small.Beyond October 06 2008, the full dataset is provided online through HTTP and THREDDS web services. Access points are provided below. For offline requests, the native GRIB2 NDFD data is converted to GRIB1 after the data has been retrieved from the archive. This enables the creation of graphics using the web interface. NDGD
The analysis used as guidance for the NDFD known as the National Digital Guidance Database (NDGD) has been separated from the NDFD and placed online here:
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