|[New] or [Modification]
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| Enhanced Product Modification of Severe Convective Warnings and Associated Follow up Statements to Emphasize Impacts, Intensity and Recommended Actions via Bulleted Messaging and Coded Tag Lines ( Enhanced)||Enhanced wording within format of Tornado Warnings (TOR), Severe Thunderstorm Warnings (SVR), and Associated Follow-up Statements (SVS). Messages are modified to emphasize impacts, intensity, and recommended actions via bulleted messages and coded tag lines. Note Modification: Experimental product applicable to all Central Region WFOs, comment period extended.|| PDD_CR_IBW_020613.pdf|
| Enhanced Product- Addition of Forecast Maximum Hail Size Coding to Tornado Warnings and Associated Follouw-up Statements ( Enhanced)||The Tornado Warning (TOR) is an alphanumeric product providing short-fused warning in¬formation on hazardous conditions associated with thunderstorms which are expected to spawn one or more tornadoes, thus posing a threat to life and/or real property. This product is prepared by each National Weather Service (NWS) Weather Forecast Office (WFO) for their County Warning Area (CWA) of responsibility. Integrated Warning Team workshops, as well as several societal impacts groups, have indicated a desire by many emergency managers and media partners for a concise tag line on the end of the TOR product (as well as associated SVS follow-up statements) identifying maximum hail size expected for the storm(s) which prompted the TOR issuance. Decoding this tag line will facilitate the capability for partners to rapidly decode this information to make important decisions concerning the ancillary hail threat associated with those storms. || SDD_CR_TORtag.pdf|
| Enhancement to National Spot Webpage: Experimental HYSPLIT Trajectories Request Function ( Enhanced)||The National Spot Webpage provides a nationally uniform portal for NWS customers to request, receive, and leave feedback for site specific spot forecasts.
As of September 19, 2011, the National Spot Webpage will host a new functionality for requesting HYSPLIT (Hybrid Single Particle Lagrangian Integrated Trajectory model) trajectory runs from NOAA’s Air Resources Laboratory (ARL) on an experimental basis. These elements will be available based on the NAM for the CONUS, and based on the GFS for Alaska and Hawaii.The HYSPLIT Trajectories Request Function would allow users to request HYSPLIT trajectory runs at 500, 1500, and 3000 meters for the latitude/longitude of the spot request. The trajectory runs will begin at the specified ignition time on the spot request. To request HYSPLIT trajectories with a spot request, the user must enter the phrase “hysplit to firstname.lastname@example.org” in the remarks section of the spot request form. The HYSPLIT trajectory raw data, as well as gif and kml files will be sent to the specified email address.
| Experimental Addition of Percentiles of Snow and Ice Accumulations to the PWPF ( Enhanced)||The HPC Probablistic Winter Precipitation Forecast (PWPF) suite was made operational March 13, 2012. This suite includes displays of probabilities for snowfall or freezing rain exceeding a number of thresholds (Probability of exceedance). HPC will be enhancing this product suite by adding percentiles of snow and ice accumulations over the continental U.S on an experimental basis.|| HPC_PWPF_PDD-1.pdf|
| Experimental Alaska Region NDFD Grids ( NEW)||PDD updated in 2013 to extend comment period.
PDD updated in 2012 to extend comment period.
PDD updated in 2011 to extend comment period.
PDD updated in 2010 to extend comment period and to update links.
PDD updated in 2009 to include new elements:
Hazards, Weather, Temperature, Dew Point, Wind Gust, Sky Cover, Apparent Temperature, Relative Humidity, Quantitative Precipitation Forecast (QPF) and Snow Amount.
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 users. The most
recent experimental digital datasets (and associated graphic forecast displays) integrated into NDFD are the following elements for Alaska: Maximum Temperature, Minimum Temperature, 12-hour Probability of Precipitation, Wind Speed, Wind Direction, and Significant Wave Height. || AK_ExperimentalPDD_01172013 .pdf|
| Experimental Aviation Impact Guidance for Convective Weather (AIGCW) ( NEW)||The Aviation Impact Guidance for Convective Weather (AIGCW) is a graphical forecast capability that represents the probability of convective weather impacting air traffic operations in the National Airspace System (NAS). The weather portion of this product utilizes the Short Range Ensemble Forecast (SREF) Calibrated Thunderstorm output and the air traffic portion utilizes a 5-year sample set of historical air traffic data from 1 January 2004 through 31 December 2008. The AIGCW capability is then able to graphically illustrate the probability of convective weather impact to the normal albeit historical flow of air traffic in the NAS. The AIGCW was developed in conjunction with the FAAs longer range collaborative strategic planning process which is well beyond the traditional 6hr strategic planning timeframe. AIGCW provides a convective weather impact forecast to air traffic flows for 1-hour forecast intervals through 39 hours and 3-hour intervals through 87 hours. || AIGCW_PDD.pdf|
| Experimental Aviation Winter Weather Dashboard ( NEW)||The Experimental Aviation Winter Weather Dashboard depicts the potential winter weather impact to the Core 30 (minus Honolulu) airports. Updated four times per day, the web display shows the potential impact to each airport through a matrix of color coded boxes that depict nominal (green), slight (yellow), moderate (orange), and high (red) impact through eighty-seven forecast hours. The impact information is calculated using the Short-Range Ensemble Forecast (SREF) numerical weather prediction system || expr_common_wint_wx_pdd.pdf|
| Experimental Cold Advisoroy for Newborn Livestock National Digital Forecast Database Grids ( NEW)||The Cold Advisory for Newborn Livestock (CANL) System provides users with a decision support tool that could help reduce newborn livestock losses due to hazardous weather. The CANL was approved for operational implementation at the eight Western and Central Region WFOs that participated during the experimental period, effective March 19, 2013.
As a result of customer satisfaction of the CANL products at the eight locations, the livestock industry expressed an interest in expanding the system to cover more areas across the country. Adding CANL grids in the National Digital Forecast Database (NDFD) can best address this expansion request
The Cold Advisory for Newborn Livestock index forecast is now available as an element in NDFD experimentally. The CANL system uses the current NDFD forecast grids for temperature and wind (wind chill/sometimes called apparent temperature, humidity, sky conditions and Quantitative Precipitation Forecasts (QPF) to create a graphic that shows the potential for weather related impact to newborn livestock.
| Experimental Enhanced Hazardous Weather Outlook (EHWO) ( NEW)||The NWS core mission is to provide accurate and timely hazardous weather information for the protection of life and property. Although the textual Hazardous Weather Outlook (HWO) plays a vital role in supporting the NWS mission, effectively conveying hazardous weather information in a textual or narrative format can prove challenging to an increasingly diverse customer base.
The EHWO is a decision support service that supports preparedness and response efforts prior to and during hazardous weather. In conjunction with the textual HWO, the clear and concise Internet-based EHWO graphics provides decision makers with convenient access to potential weather hazard information by graphically depicting the risk of multiple weather hazards out to seven days in the future.
The Advanced Weather Interactive Processing System (AWIPS) Graphical Forecast Editor (GFE) produced EHWO packages multi-level color coded hazard graphics and text within a comprehensive web page suite. Further, weather hazards and thresholds are easily customized based on external customer needs for a particular office. Ultimately, workload is conserved through the use of existing local and national guidance GFE grids such as the Storm Prediction Center and the Hydrometeorological Prediction Centers, supporting a seamless office to office presentation.
| Experimental Facebook Pages ( NEW)||Facebook, the largest of the social media sites, is a social networking web site where users can connect and interact with other people, organizations, and businesses. NWS will be using local and national facebook pages as a supplemental channel to experimentally disseminate environmental information and promote weather awareness activities including outreach and educational efforts|| facebook_sdd.pdf|
| Experimental Forecast of Reference Evapotranspiration for Short Canopy Vegetation (CR) ( NEW)||The experimental reference evapotranspiration forecast will be displayed as a graphic of gridded data within the WFOs county warning area. The forecast is the expected amount of daily reference evapotranspiration in hundredths of an inch for the next 7 days and a total reference of evapotranspiration for the 7 day period. The forecast is calculated by standardizing on the tall canopy vegetation (50 cm full cover alfalfa) algorithm. This product will be issued three times a day around 5 am, 12 pm, and 4 pm local time. || PDD_Extension_Central_Region_Evapotranspiration_Digital_Forecast.pdf|
| Experimental Forecast of Reference Evapotranspiration for Short Canopy Vegetation (WR) ( NEW)||The experimental reference evapotranspiration forecast will be displayed as a graphic of gridded data and a supplemental tabular display of selected sites within the WFOs county warning area. The forecast is the expected amount of daily reference evapotranspiration in hundredths of an inch for the next 7 days and a total reference of evapotranspiration for the 7 day period. The forecast is calculated by standardizing on the short canopy vegetation (12 cm or 4.72 in grasses or alfalfa) algorithm. This product will be issued twice a day around 5 am and pm local time.|| FRET_Ext_PDD.pdf|
| Experimental Gridded Marine Offshore and High Seas Forecasts in the NDFD ( NEW)||The National Weather Service’s National Hurricane Center’s Tropical Analysis and Forecast Branch (TAFB), the National Centers for Environmental Prediction’s (NCEP) Ocean Prediction Center (OPC) and the Honolulu Weather Forecast Office (HFO) will provide gridded forecasts of four marine weather elements to the National Digital Forecast Database (NDFD) on an experimental basis for their offshore waters and high seas forecast areas of responsibility for the Atlantic and Pacific basins. The Weather Forecast Offices (WFO’s) in Fairbanks, Anchorage and Juneau Alaska will continue to supply on an experimental basis to the National Digital Forecast Database (NDFD) gridded forecasts of five marine weather elements over their offshore waters in the Arctic basin. || Ex_Grid_Offshore_HS_ndfd.pdf|
| Experimental HPC Days 6-7 QPF ( NEW)||This product provides Quantitative Precipitation Forecasts (QPFs) for days 6 and 7 in six hour increments as well as an aggregated day 6 and 7 total, and a complete 7-day total.|| HPC_6hr_day_67_QPF_PDD.pdf|
| Experimental Ice Accumulation Grids ( NEW)||Ice Accumulation Grids will be available in the NDFD on an experimental basis. OCWWS will issue a Technical Information Notification to alert users (with 30 days advance noticre) that an experimental period will commence in addition to a coordination memo for field offices which describes smart tools to create ice accumulation grids.|| ndfd_iceaccum.pdf|