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National Weather Service
Listing of EXPERIMENTAL Products
Product Name Brief Description Submitter Date Entered
Experimental User Defined Area Forecast Web Application Enhanced Service, allowing user to select area for which forecast information is derived from the point-and-click data base. The User Defined Area Forecast (UDAF) is an Internet-accessible application which allows direct interaction with the full resolution (2.5km horizontal grid spacing) NWS netCDF forecast data base to obtain forecast information within a geographic area specified by the user. The interface allows an individual to define geographical boundaries in both area and elevation, and submit those values to retrieve a forecast directly from the digital forecast data base populated by NWS meteorologists at local weather forecast offices (WFOs) responsible for that user-defined polygon domain. Output is presented in the same format as the point-and-click forecast, but based on an average value of the area specified. Additionally, a table with maximum and minimum values is created, along with statistics about the size and elevation range of the selected area. The area itself is displayed graphically to ensure the area from which the data is derived matches the user’s identified zone of interest. A future upgrade will incorporate affected population within the table, by querying the US census data base. Kim Runk 2013-03-29
Experimental Water Information Interface Webpage Effective on or about Tuesday, June 14th, 2016, the National Centers for Environmental Prediction (NCEP) will begin operationally running version 1.0 of the National Water Model (NWM). The NWM is an hourly uncoupled hydrologic analysis and forecast system that will provide streamflow for 2.7 million river reaches and other hydrologic information on 1km and 250m grids. The NWM provides the NWS with a multi-scale, parallelized, process-based water cycle modeling capability. Upon initial implementation, the NWM system will provide multiple country-wide hydrologic analysis products and forecast output across a range of forecast lead times. These will be combined with other data from NOAA to provide the Nation with comprehensive information on a range of water-related concerns such as snowpack, soil moisture, and potential areas of flooding.Version 1.0 of the NWM will provide a capable and solid foundation that will support year-over-year growth in operational hydrologic forecasting capability. Goals for this initial implementation include: 1) Provide forecast streamflow guidance for underserved locations 2) Produce spatially continuous national estimates of hydrologic states (soil moisture, snow pack, etc.) 3) Seamlessly interface real-time hydrologic products into an advanced geospatial intelligence framework 4) Provide a modeling architecture that permits rapid infusion of new data, science and technology Dan Roman 2016-03-16
Experimental Weather, Water, and Climate Information Podcasts Podcasts are produced through the use of Really Simple Syndication (RSS) feeds and industry-standard mp3 files created by the NOAA Weather Radio All Hazards (NWR) broadcast management system that can be distributed over the Internet using syndication feeds, for playback on mobile devices and personal computers, thus making NWS data and products available in Internet-accessible, vendor-neutral form. The Podcasts are not a replacement for NWR and do not offer the warning capability of NWR Specific Area Message Encoding or Warning Alarm Tone, but rather allow the user to download products for playback at a later time on their computer or portable mp3 player. Mike Szkil 2007-06-05
Experimental Weeks 3-4 Precipitation Outlook The NWS Climate Prediction Center (CPC) issues temperature and precipitation outlooks for the Week-2 and 1-month outlook periods. To close the gap- intermediate time scale (i.e., Weeks 3-4) between the 2 week and 1 month forecast time horizons, the CPC developed and solicited comments on the Experimental Weeks 3-4 Temperature and Precipitation outlooks. The Temperature outlook has been approved for operational implementation. The precipitation outlook needs additional testing and the experimental comment period has been extended for another year. The objective of the product is to highlight regions where above or below average 2-week mean total precipitation are favored as well as provide advance notice of potential precipitation pattern changes to further assist decision makers in weather and climate sensitive activities in their decisions. Jon Gottschalck 2017-04-18
Experimental Weeks 3-4 Temperature Outlook The National Weather Service, Climate Prediction Center delivers real-time products and information in order to monitor and predict climate variations and their potential associated impacts on timescales from weeks to about 1 year. The objective is to promote effective management of climate risk and a climate-resilient society. Currently, the Climate Prediction Center issues temperature outlooks for the Week-2 and 1-month outlook time periods. No current products exist for the intermediate timescale (i.e. Week 3-4) between these two forecast time horizons. The initial release of the experimental Week 3-4 Temperature Outlook will consist of two components. These are (1) a temperature outlook map targeting the combined Week 3-4 outlook, and (2) prognostic map discussion (PMD) text explaining the rationale for the forecast. Jon Gottschalck 2015-08-28
Experimental Wind Compression Decision Support Graphic Compression is an Air Traffic Control (ATC) phenomena that occurs when aircraft flying Standard Terminal Arrivals (STARS), usually following one behind the other (nose to tail or in air traffic known as Miles in Trail (MIT)), lose adequate horizontal separation from each other. The phenomenon that creates this is usually a change in wind direction and speed between the two aircraft. Compression can occur when an aircraft, during descent, transitions from a tailwind, or a weak headwind, to a stronger headwind over a small change in altitude. This change could also occur with a heading change of the aircraft during its approach. The purpose of the Experimental Wind Compression Graphic is to calculate the likelihood of ATC wind compression within the participating Terminal Radar Approach Control (TRACON) facilities. Melinda Bailey 2013-05-30
Proposal to operationally implement the Hurricane Local Watch/Warning Product (TCV) at WFO Honolulu The Hurricane Local Watch/Warning product (TCV) was operationally implemented at Weather Forecast Offices (WFOs) in the Atlantic hurricane basin during the 2015 Hurricane season to accompany changes made to the Hurricane Local Statement. Plans to implement for Western Region and the remainder of Pacific Region are to be determined at a later date. For the 2017 Hurricane Season, WFO Honolulu plans to begin issuing the TCV in the same format used by the WFOs covering the Atlantic Hurricane Basin. There will be no changes for Western Region or for other WFOs in the Pacific Region. Jessica Schauer 2016-12-06
Proposed changes to the Surface Analyses and Forecast charts for OPC, TAFB, and WFO HNL The OPC would change the content of its surface analyses, and 24-, 48-, and 96-hour forecast charts. The TAFB would change the content of its surface analyses and 72-hour forecast charts. WFO Honolulu, Hawai’i would change the content of its surface analyses. The proposed change would be for these charts to contain future forecast track information only for extratropical low pressure systems that have, or are forecast to have, hazards associated with them. The hazards displayed will be gale, storm, hurricane-force, developing gale, developing storm, developing hurricane-force, and possible tropical cyclone. Heavy freezing spray information and the ice edge will be included as well. As proposed, the analysis and forecast charts will no longer include past track information, and forecast tracks for highs, extratropical lows with none of the aforementioned hazards associated with them or expected, and tropical cyclones. This change will improve OPC, TAFB, and WFO Honolulu forecaster ability to provide detail in their digital forecasts. For OPC, the change will provide flexibility in the OPC workflow to test and potentially implement a 72-hour forecast chart. Additionally, the change will ensure consistency of information regarding tropical cyclones found through text and graphics supplied by the NHC, Central Pacific Hurricane Center (CPHC), and Joint Typhoon Warning Center (JTWC). Darin Figurskey 2017-02-27
Proposed changes to the criteria for issuing tropical cyclone watches and warnings to include certain land-threatening disturbances that are not yet tropical cyclones The National Weather Service (NWS) proposes beginning on or about May 15, 2017,to have the option to issue watches, warnings, and graphical and textual advisory products for disturbances that are not yet a tropical cyclone, but which pose the threat of bringing tropical storm or hurricane conditions to land areas within 48 hours. Under previous long standing NWS policy, the NWS has not been permitted to issue a hurricane or tropical storm watch or warning until after a tropical cyclone had formed. Jessica Schauer 2017-01-31
Proposed changes to the Graphical Tropical Weather Outlook Enhancements to the operational Graphical Tropical Weather Outlook Wayne Presnell 2017-03-03
Proposed Changes to the Hurricane/Typhoon Local Statement at WFO HNL The following changes to the operational Hurricane/Typhoon Local Statement (HLS) were implemented for the 2015 hurricane season (for the Atlantic Hurricane basin only): 1) HLS is a non-segmented product - No Universal Geographical Code (UGC). 2) HLS contains no Valid Time Event Codes (VTEC). 3) HLS covers land areas only. For the 2017 Hurricane Season, Weather Forecast Office (WFO) Honolulu plans to begin issuing the HLS in the same format used by the WFOs covering the Atlantic Hurricane Basin. There will be no changes for Western Region or for the other WFOs in the Pacific Region. Jessica Schauer 2016-12-06
Proposed Changes to the National Tropical Cyclone Watch and warning (TCV) products for the Atlantic Basin for 2017 Effective on or around June 1, 2017, the National Hurricane Center (NHC) will expand the tropical cyclone watch and warning information available in its National Tropical Cyclone Watch/Warning (TCVAT#) products issued for Atlantic tropical cyclones. In past hurricane seasons, the National TCV products for the Atlantic basin contained only the tropical cyclone wind watches and warnings along coastal segments issued by NHC. Beginning in the 2017 hurricane season, the national TCV products from NHC for the Atlantic basin will include all NWS-issued zone-based tropical cyclone wind and storm surge watches and warnings from both NHC and local Weather Forecast Offices (WFOs) and will no longer contain breakpoint information. Wayne Presnell 2017-02-27
Proposed Changes to the NWS Forecast Web Page The National Centers for Environmental Prediction Central Operations (NCO) is soliciting comments on changes to the Point Forecast application at The purpose of these changes are to create a more usable interface with no duplication of service to customers, while providing a more modern service oriented data structure. Kolly Mars 2016-08-19
Proposed changes to the Operational Collaborative Convective Forecast Product (CCFP):Traffic Flow Management Convective Forecast (TCF) The Federal Aviation Administration (FAA) has requested the National Weather Service (NWS) update the CCFP to only include high-confidence forecasts and to rename the product the Traffic Flow Management (TFM) Convective Forecast (TCF). Like the CCFP, the TCF is a NWS product collaborated by meteorologists at the Aviation Weather Center (AWC) in Kansas City and embedded at the FAA Air Traffic Control System Command Center (ATCSCC) in Warrenton, VA, at the Center Weather Service Units (CWSU) embedded at the FAA’s Air Route Traffic Control Center (ARTCC), and at various airlines and authorized organizations. The TCF is a high confidence graphical representation of forecasted convection meeting specific criteria of coverage, intensity, and echo top height. These forecasts will allow Air Traffic Management (ATM) decision makers to proactively and collaboratively initiate, amend, or terminate planned or active Traffic Flow Management initiatives, resulting in safe and efficient use of the NAS. Clinton Wallace 2017-02-10

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