| Product Name |
Brief Description |
View PDD |
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| National Convective Weather Forecast | The National Convective Weather Forecast (NCWF) is an automatically generated convective product that provides current convective hazards and 1 hour extrapolation forecasts of thunderstorm hazard locations. | NCWF.pdf |
| National Digital Forecast Database (NDFD) Climate Outlook Probability Elements | The 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 Climate Prediction Center (CPC) is the NWS center of expertise for climate outlooks covering valid periods of one week, one month, and three-months, with lead times (i.e. advance issuance before the beginning of the valid period) from a zero lead to 12.5 months of lead time.
The following Climate Outlooks by the CPC are available in the NDFD in operational status. The outlooks are probabilistic (expressed in percent).
Probability of 8- to 14-Day Average Temperature Above Normal
Probability of 8- to 14-Day Average Temperature Below Normal
Probability of 8- to 14-Day Total Precipitation Above Median
Probability of 8- to 14-Day Total Precipitation Below Median
Probability of One-month Average Temperature Above Normal
Probability of One-month Average Temperature Below Normal
Probability of One-month Total Precipitation Above Median
Probability of One-month Total Precipitation Below Median
Probability of Three-month Average Temperature Above Normal
Probability of Three-month Average Temperature Below Normal
Probability of Three-month Total Precipitation Above Median
Probability of Three-month Total Precipitation Below Median
All of these elements are available for the contiguous U.S. (CONUS), the 16 pre-defined NDFD CONUS subsectors and Alaska.
These probabilistic outlooks pertain to the average temperature and total precipitation for the entire valid period and not to the variability within it; these outlooks will not help people planning events for specific dates or sub-periods. | 12CPCNDFDPDD.pdf |
| National Digital Forecast Database (NDFD) Convective Outlook Hazard Probability Elements | As 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 forecaster’s 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.
| SPC_NDFD_APR2009.pdf |
| National Digital Forecast Database (NDFD) Graphic Forecast Displays | The National Oceanic and Atmospheric Administration (NOAA) National Weather Service (NWS) National Digital Forecast Database (NDFD) Graphic Forecast Displays (http://weather.gov/forecasts/graphical/sectors/index.php) 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: http://www.nws.noaa.gov/ndfd/index.htm. | NDFDGraphics.pdf |
| National Digital Forecast Database (NDFD) Gridded Data | Under 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.
| NDFDGrids.pdf |
| National Digital Forecast Database Extensible Markup Language | National 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.... | Extensible_Markup_Language.pdf |
| National Digital Forecast Database User Defined GRIB2 files | Gridded 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.... | User_Defined_Grib2_OFFICIAL.pdf |
| National Drought Summary | NOAA'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. | NDS.pdf |
| NATIONAL MULTI-SENSOR PRECIPITATION ESTIMATES WEB-BASED SERVICE | These 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.
| interregionpcppdd20071018-1.pdf |
| National Snow Analysis | The 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: www.nohrsc.nws.gov. 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.... | PDD_NationalSnowAnalysis.pdf |
| NAVTEX Forecast | The 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.
| NAVTEXForecast.pdf |
| NDFD CLIMATE | NDFD 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. | NDFDClimatePDD.pdf |
| NDFD Quantitative Precipitation Forecast (QPF) for Hawaii | On November 1, 2006, the National Oceanic and Atmospheric Administration (NOAA) National Weather Service (NWS) will introduce 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. | hi_qpf_pdd_expr_110106.pdf |
| 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.
| NSF.pdf |
| Nephanalysis | A 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.
| Neph.pdf |
weather.gov 
