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National Weather Service
Report - listing of Operational Products in database, sorted by product name.
Product Name Brief Description     Click Here for "Printable" version of this list.
National Digital Forecast Database (NDFD) Convective Outlook Hazard Probability ElementsAs of April 30, 2009, the following Convective Outlook Hazard Probability elements prepared by the SPC are now available in the NDFD in operational status Categorical Convective Outlook for today (Day 1), tomorrow (Day 2), and the day following (Day 3) Probability of Tornadoes (Day 1) Probability of Hail (Day 1) Probability of Damaging Thunderstorm Winds (Day 1) Probability of Extreme Tornadoes (Day 1) Probability of Extreme Hail (Day 1) Probability of Extreme Thunderstorm Winds (Day 1) Total Probability of Severe Thunderstorms (Day 2 and Day 3) Total Probability of Extreme Severe Thunderstorms (Day 2 and Day 3) All of these elements are currently only available for the contiguous U.S. (CONUS) and the 16 pre-defined NDFD CONUS subsectors. The Convective Outlook Probabilities are issued for a convective day from 12 UTC to 12 UTC. Day 1 Outlooks are valid from 12 UTC on Day 1 (or, if issued after 12 UTC from the issuance time) to 12 UTC on Day 2. The Day 2 products are valid from 12 UTC on Day 2 to 12 UTC on Day 3. The Day 3 products are valid from 12 UTC on Day 3 to 12 UTC on Day 4. The Categorical Convective Outlook elements specify the perceived level of threat via the descriptive wording Slight, Moderate, and High Risk. However, these outlooks, do not display the forecasterís expectations of the individual severe weather hazards (large hail,damaging winds, and tornadoes) The individual probabilistic elements further express forecaster uncertainty of the individual severe weather hazards through the use of probabilities (i.e., percent likelihood of occurrence). In the Day 1 period, forecaster expectations of large hail, damaging winds, and tornadoes are explicitly conveyed in separate forecasts. By producing forecasts of each hazard individually, users who are sensitive to one particular threat (e.g., car dealers and large hail) can make more informed decisions.
National Digital Forecast Database (NDFD) Day 4 to 8 Convective Outlook ElementsThe NWS provides access to operational and experimental gridded forecasts of weather elements (e.g., maximum temperature, sky cover) through the National Digital Forecast Database (NDFD). The NDFD contains a seamless mosaic of digital forecasts from NWS field offices and the National Centers for Environmental Prediction (NCEP). NCEP's Storm Prediction Center (SPC) operationally produces detailed outlooks and probability products for severe convective weather for Days 1, 2, and 3, and a more general Day 4 to 8 convective outlook (available as text and graphic products at This element is a forecast for organized severe thunderstorms over the contiguous United States. A severe weather area depicted in the day 4 to 8 period indicates a 30% or higher probability for severe thunderstorms within 25 miles of any point
National Digital Forecast Database (NDFD) Graphic Forecast DisplaysThe National Oceanic and Atmospheric Administration (NOAA) National Weather Service (NWS) National Digital Forecast Database (NDFD) Graphic Forecast Displays ( are web-based presentations of digital forecast data originating from local Weather Forecast Office (WFO) digital databases and the NDFD server. The data are displayed in a mosaic form on national and regional scales. Local scale products are not covered under this Product Description Document (PDD). For more information on the NDFD, please refer to the NDFD Information web site at the following URL:
National Digital Forecast Database (NDFD) Gridded DataUnder statute, the National Oceanic and Atmospheric Administration (NOAA) National Weather Service (NWS) is charged to collect data on climate, water, and weather, provide forecasts and warnings of severe weather in order to protect life and property, and create and disseminate forecasts and other weather information for the benefit of a wide range of weather sensitive businesses and activities. By capitalizing on rapid advances in science and technology and infusing these advances into its operations, the NWS has taken steps to proactively respond to ever changing and growing demands of its customers and partners. The 2003 Fair Weather report, produced by the National Research Council, recommended making NWS data and products available in an Internet accessible digital form. The specific recommendation is as follows: ?Information held in digital databases should be based on widely recognized standards, formats, and metadata descriptions to ensure that data from different observing platforms, databases, and models can be integrated and used by all interested parties in the weather and climate enterprise.? The Internet is now a principal means of communicating NWS forecasts.
National Digital Forecast Database (NDFD) Map ViewerThe National Digital Forecast Database (NDFD) contains a seamless mosaic of digital weather forecasts from National Weather Service (NWS) field offices and the National Centers for Environmental Prediction (NCEP). The new map viewer enables users to interactively zoom and roam experimental NDFD forecast grids displayed at full resolution.
National Digital Forecast Database Extensible Markup LanguageNational Digital Forecast Database (NDFD) Extensible Markup Language (XML) is a service providing the public, government agencies, and commercial enterprises with user selected components for point locations of the National Weather Service?s (NWS) data embedded in XML elements. NDFD XML provides users the ability, using a machine-to-machine paradigm, to retrieve the XML-wrapped data via the Internet. This web service is provided using the SOAP protocol....
National Digital Forecast Database User Defined GRIB2 filesGridded forecasts requested by a user from the National Digital Forecast Database (NDFD) are encoded into GRIB2 and transmitted to that user via the World Wide Web (WWW). A user can be any member of the public, a government agency, or a commercial enterprise. The user chooses one of the weather elements that is available in the NDFD and specifies the bounding latitudes and longitudes of the grid that will be transmitted via a Web CGI interface. GRIB2 is data encoding standard described by the World Meteorological Organization in its document FM92 GRIB, Edition 2, Code Form and Tables....
National Drought SummaryNOAA's Climate Prediction Center and National Climatic Data center (NCDC), the U.S. Department of Agriculture, and the National Drought Mitigation Center (NDMC) jointly issues this narrative summarizing drought conditions with a look ahead.
National Fire Weather Web PageThe ability of the National Weather Service (NWS) to provide digital and graphic fire weather products and services over the internet continues to increase. Concurrently, the need for improved fire weather information on the internet by land management and fire suppression agencies also continues to increase. Multiple federal fire weather user agencies have expressed a need for an improved national fire weather web page that includes more interactive graphics. OS/22 Fire and Public Weather Branch began testing a new, highly interactive national fire weather web page October 1, 2009. Because existing fire weather information is bundled and/or presented in new formats, the national fire weather web page is considered a new experimental service
NATIONAL MULTI-SENSOR PRECIPITATION ESTIMATES WEB-BASED SERVICEThese Quantitative Precipitation Estimates (QPE) Graphics are representations of rainfall that has occurred for a specific length of time. Currently, each RFC prepares its QPE graphics using different colors, precipitation thresholds, and geographic projections. By producing these graphics centrally, it will enable the public to compare data across the CONUS and Puerto Rico. Parameter-Elevation Regressions on Independent Slopes Model (PRISM) climate data from a cooperative venture between Oregon State University and the United States Department of Agriculture-Natural Resources Conservation Service provides a grid format of normal precipitation.
National Snow AnalysisThe National Operational Hydrologic Remote Sensing Center (NOHRSC) is a branch in the Office of Climate, Water, and Weather Services in the National Weather Services (NWS) and is collocated with the NWS North Central River Forecast Center and the Weather Forecast Office in Chanhassen, Minnesota. The NOHRSC produces a daily National Snow Analysis (NSA) and distributes a variety of snow summaries and data sets derived from both observed and modeled hydrometeorological data. The NOHRSC NSA provides daily, comprehensive snow information for the coterminous U.S. and is accessed at: The NSA is based on modeled snowpack characteristics that are updated using all operationally available ground-based, airborne, and satellite observations of snow water equivalent, snow depth, and snow cover....
National Snowfall AnalysisThe National Weather Service (NWS) collects snowfall data from NWS Cooperative Observers (COOP) and from Community Collaborative Rain Hail and Snow Network (CoCoRaHS) observers to support its forecast and warning operations. Individual Weather Forecast Offices (WFOs) typically provide snowfall collectives in text (and occasionally in graphical) format for their areas of responsibility. This service provides unified snowfall analysis estimates for the continental US. The service includes an interactive web based map to display the snowfall analysis, as well as the ability to download the information in shape file format
NAVTEX ForecastThe NAVigational TEXt (NAVTEX) product is issued exclusively for the U.S. Coast Guard NAVTEX radio-teletype transmitters and receipt of those mariners equipped with NAVTEX receivers. The product contains marine forecasts and warnings.
NCEP Central Operations Model Analyses and Guidance Web Site This NWS/NCEP Web Site showcases National Weather Service's observtional database and graphical suite of numerical model anlysis and guidance. The site is maintained by National Centers for Environmental Prediction (NCEP) Central Operations (NCO) and NOAA's Web Operations Center(WOC). In an effort to respond to user needs to protect life and property and support the nation's growing need for environmental information, a streamlined graphical approach in displaying products used by forecasters in making forecasts will serve not only NWS Offices but also the private and public sectors. This page was is periodically enhaced to accommodate requests from customers.
NDFD CLIMATENDFD Climate is a computer application that creates images of forecast and climatological parameters for the continental U.S. from two different digital data sets. The first data set is the NDFD (National Digital Forecast Database) weather forecast grids produced by the NOAA National Weather Service (NWS) and the second data set is PRISM (Parameter-elevation Regressions on Independent Slopes Model), an expert system that uses point climatological temperature data and a digital elevation model (DEM) to generate gridded estimates of climate parameters. The NOAA National Weather Service (NWS) National Digital Forecast Database (NDFD) contains digital forecast grids of sensible weather elements such as temperature, wind, and precipitation in a mosaic from collaborating field offices across the U.S. for forecasts out to seven days. Daily digital climatology grids of maximum and minimum temperature are created using Parameter-elevation Regressions on Independent Slopes Model (PRISM; Daly et al. 1994) method. NDFDClimate grids produced include: PRISM derived normal daily maximum and minimum temperatures, NDFD derived forecasted heating and cooling degree days through day 6, NDFD forecasted daily minimum and maximum temperature anomalies derived from PRISM daily climate fields through day six, NDFD derived five day total of forecast heating and cooling degree days, NDFD 60 hour total of liquid equivalent QPF, NDFD forecasted number of hours the temperature is above or below a defined temperature through day three, NDFD forecasted 24- and 48-hour forecast temperature changes from forecast issue time.
NDFD Full Resolution The resolution has been increased in the National Digital Forecast Database. The NDFD spatial resolution will be available in experimental status at 2.5km resolution for all forecast times. The NDFD temporal resolution will be available in experimental status at one hour resolution for the first 36 hours from NDFD issuance time. These are the finest spatial and temporal resolutions at which Weather Forecast Offices in the Conterminous United States /CONUS/ provide forecasts. Forecasts from NWS offices and centers employing coarser resolutions will be mapped onto the finer resolution NDFD grid This change will affect files which contain data for the entire CONUS, but will not include Alaska, Hawaii, Guam, Puerto Rico and the Virgin Islands, or the 16 CONUS subsectors which will remain at their current operational resolutions
NDFD Quantitative Precipitation Forecast (QPF) for HawaiiOn July 8, 2008 the Quantitative Precipitation Forecast (QPF) for Hawaii to the National Digital Forecast Database (NDFD) was transitioned to operationa Status. On November 1, 2006, the National Oceanic and Atmospheric Administration (NOAA) National Weather Service (NWS) introduced Quantitative Precipitation Forecast (QPF) for Hawaii to the National Digital Forecast Database (NDFD) as an experimental element. QPF is already available in NDFD on an experimental basis for the conterminous U.S. (CONUS), the 16 pre-defined NDFD CONUS subsectors, Puerto Rico, and the U.S. Virgin Islands.
Nearshore Forecast (NSH)The NSH describes forecast conditions including any event-driven marine hazards occurring or expected to occur over the Great Lakes nearshore waters for a 48 hour forecast period.
NephanalysisA graphical product routinely prepared for the Central and Eastern Pacific Ocean Basin that provides a depiction of significant cloud features, a description of the cloud types, and their areal coverage.
New Forecast at a Glance Point and Click IconsThe new icons are intended to enhance communication of rapidly changing weather conditions, while also highlighting current weather hazards.
NHC Audio Briefings (Podcasts) The National Hurricane Center (NHC) provides audio briefings (also called podcasts) when the media pool is activated by the NHC Public Affairs Officer. The audio feeds are created in mp3 format. The service is intended to provide users with additional information to enhance their ability to make planning and preparedness decisions. Currently, NHC media briefings are only broadcast on television or select radio stations, at the stationsí discretion. MP3 format allows the general public to access these briefings. The podcasts will also increase the distribution of NHC media briefings to additional outlets, to include newspapers and radio stations.
NHC/TAFB Satellite Rainfall QPE and QPF Webpage This product provides event-driven satellite-based quantitative precipitation estimates (QPE) and model-derived quantitative precipitation forecasts (QPF) for tropical cyclones and tropical disturbances affecting areas within the National Hurricane Center and Central Pacific Hurricane Center areas of responsibility (AOR). The product represents an improvement over the existing text-only satellite precipitation estimate product which is based on the Griffith-Woodley technique developed in the 1970s. The experimental product provides more robust satellite-based precipitation estimates from the Naval Research Laboratory (NRL) Blended and the Climate Prediction Center (CPC) QMORPH techniques and a time-matched forecast from the Global Forecast System (GFS) in tabular text and storm centered graphical formats. An experimental graphical version of these precipitation estimates is also provided as well as an experimental graphical 24 hour QPF from the Princeton Geophysical Fluid Dynamics (GFDL), the NOAA Hurricane Weather Research and Forecast (HWRF), and the GFS models. The target audience for this product primarily includes the forecast centers in the Caribbean, Mexico, Central America, and the Eastern and Central North Pacific. . In addition, decision support service (DSS) entities would have access to targeted QPF guidance that may be of assistance for distributing and directing resources to areas impacted by heavy rainfall
NHC/TAFB Web Based Graphicast Daily graphical/alphanumeric depiction of significant weather features expected to affect the Tropical North Atlantic, Tropical Northeast Pacific and Southeast Pacific offshore waters and high seas area of responsibility of the Tropical Analysis and Forecast Branch.
NOAA NWS RFC Soil Moisture Model OutputThe North Central River Forecast Center (NCRFC) has been exploring usability of National Weather Service (NWS) river forecast model soil moisture model output for applications beyond river flood forecasting. This valuable output could be used to support various activities related to economic cost savings for industry sectors involved in land resource management.
NOAA Weather Radio PodcastsThe NWS is responsible for making its weather, water and climate information widely available to taxpayers using commonly accepted standards and technologies. Currently, the NWS provides only limited audio broadcasts of their NOAA Weather Radio All Hazards (NWR) via the Internet. The Voice Improvement Program (VIP) software on the NWR is able to convert the text transmitted to the Console Replacement System (CRS) into MPEG audio Layer-3 (MP3) files. Southern Region NWS offices are making these MP3 files available on the Internet as podcasts. Podcasting allows for publishing of audio programs to the internet and subsequent downloading of these programs to a personal computer or MP3 device. Users subscribe to the NWR podcast by using a freely available podcasting application that downloads the MP3 file automatically using an RSS (Really Simple Syndication) feed. Podcasting applications typically check for new content (new MP3 files) at user defined intervals. Once downloaded, the user can then listen to the podcast at his/her leisure (versus a radio broadcast of NWR).

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