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National Weather Service
Listing of EXPERIMENTAL Products
Product Name Brief Description Submitter Date Entered
Experimental Enhanced Graphical Hazardous Weather Outlook (EHWO) 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. John Ferree 2010-11-18
Experimental GATE Forecast Arrival and departure sectors for major airports, also called gates, are polygonal regions which roughly follow Air Route Traffic Control Center (ARTCC) low-level sectors where arrivals and departures to these airports will be routed. It is important to know whether significant weather, such as thunderstorms, could affect large portions of the sectors so that traffic can be rerouted, if needed, to other sectors. The Gate Forecast is a decision support algorithm that uses the High-Resolution Rapid Refresh (HRRR) model to determine whether there is the potential for thunderstorm activity in a particular terminal gate. The algorithm initializes with the HRRR composite reflectivity forecasts and then does a time lag ensemble using the previous three HRRR model runs. It creates a grid with the maximum composite reflectivity at each grid point from the three runs (for example, the 1 hr. forecast from the 18UTC run plus the 2 hr. forecast from the 17 UTC run and the 3 hr. forecast from the 16 UTC run). From that grid, a probability factor is computed. Low composite reflectivity equates to low probability. High reflectivity equates to high probability. The algorithm computes the gate sector coverage of these probabilities. If more than 1% of the sector is covered in low probability (.25 chance), the gate is colored yellow. If more than 4% of the sector is covered in high probability (.60 chance), then it is colored red. These are then computed for each forecast time from the HRRR. The product display overlays the sector boundaries on the current radar loop. The sectors are color-coded using a three tiered approach: • Green - no significant weather • Yellow - some significant weather that might affect some portions of the gate • Red - significant weather that could affect large portions of the gate Around each gate is an icon with the gate name and the forecasts for the next nine hours. Clicking on the icon will bring up a dialog box that shows the percent coverage of low (2560) thunderstorm probability, the three HRRR runs used in the forecast and the time of the last update. Mike Bettwy 2015-06-02
Experimental Gerling-Hanson Wind Wave Plots The experimental Experimental Gerling-Hanson Wind Wave Plots are graphical vector plots of predefined point guidance for up to six wave trains (direction, height, and period), and wind (direction, speed) through a five day period at six hourly increments. If the point is associated with a buoy location, the previous 24 hour observations, partitioned in the same manner as the forecast waves, are plotted in three hour intervals. The forecast wave information is from the Nearshore Wave Prediction System (NWPS) model output. The wind is derived from the official forecast gridded database so they are consistent with all other forecast products, such as the Coastal Waters Forecast. WFO Eureka has been providing the Experimental Wave/Wind (Gerling-Hanson Plots) on an experimental basis since 2010. The Gerling-Hanson plots have been very useful for the marine customers and the product has been expanded to other regions for comment and review. Troy Nicolini 2014-11-07
Experimental Graphical Weather Review Webpage The WFO Corpus Christi issues daily LCO, RTP, and RRM text products for users. This local data is merged with the national AHPS rainfall data to produce PNG and KMZ files of daily high temperatures, daily low temperatures, and daily rainfall for the WFO Corpus Christi County Warning Area. The ability to retrieve past PNG and KMZ files exists within the web interface. Melinda Bailey 2013-11-08
Experimental Graphical Wind Against Current The experimental product is a graphical depiction of the maximum 24 hour wind component from the NWS Global Forecast System that opposes the surface current of the Gulf Stream system as defined by the U.S. Navy High Resolution Coastal Ocean Model (NCOM). Joseph Sienkiewicz 2014-05-01
Experimental Gridded Marine Offshore and High Seas Forecasts in the NDFD 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. Richard May 2013-03-14
Experimental Guidance from the National Blend of Models The National Weather Service (NWS) is developing the National Blend of Models (NBM) to provide a nationally consistent and skillful suite of calibrated forecast guidance based on a blend of NWS and non-NWS deterministic, ensemble, and statistically post-processed model output. The NBM was motivated by recent efforts to blend numerical model guidance to provide a better starting point for NWS gridded forecasts at the NWS Regions and the National Centers for Environmental Prediction (NCEP) Weather Prediction Center. The Disaster Relief Appropriations Act of 2013 (Sandy Supplemental) provided support for the NWS to leverage these ideas to implement a national-scale, centrally-produced, model blending approach. Cammye Sims 2016-08-19
Experimental Gulf Stream Forecast The Gulf Stream Forecast is a 3 hourly forecast for areas along the Gulf Stream as output from the NWPS model from the WFO Miami Forecast Office. The graphic display shows the Gulf Stream current, significant wave height, wind speed, and peak wave period and direction in graphical formats. There are 4 separate geographical areas, and all the graphs can be stepped in time or looped on the webpage. Melinda Bailey 2015-09-11
Experimental Impact-Based Marine Hazard Grids Impact-based marine hazard grids (IBH) provide the marine community with a detailed depiction of expected adverse weather conditions. Unlike zone-based hazards, IBH also show parts of zones where no hazard is expected which allows for continued marine operations. The Weather Ready Nation concept calls for improving information to customers and partners to enhance decision support. Providing additional hazard details fills that requirement. Jeff Lorens 2015-06-01
Experimental Lake Effect Snow Warning Polygons The experimental Lake Effect Snow Warning (LES) polygon areas delineate the locations of highest impact of the LES. As the lake effect shifts, polygon areas will change spatially and temporally to best delineate the areas of highest impact over the course of the LES event (for example, snowfall rate, blizzard-like conditions, total snowfall). Issuance of the product would be based upon forecaster confidence of reaching LES Warning criteria: 7 inches or more in 12 hours, or 9 inches or more in 24 hours. Jason Franklin 2015-09-17
Experimental Long Range River Flood Risk A national scale map with drill down capabilities on AHPS which routinely displays the long range (3-month) risk of minor, moderate and major river flooding for locations where probabilistic forecasts are produced. Mary Mullusky 2013-03-01
Experimental Maximum Wave Height in the Great Lakes Open Lake Forecast (GLF) The Open Lake Forecast (GLF) is a text product issued by five primary Great Lakes Weather Forecast Offices (WFOs) to state expected weather conditions within their marine forecast area of responsibility through Day 5. WFOs Chicago (LOT) and Detroit (DTX) are testing the inclusion of the maximum wave height in the GLF. The other three WFOs that issue the GLF (Marquette, Cleveland, and Buffalo)may be added at a later date Richard May 2013-11-27
Experimental Mobile Decision Support Services(MDSS) Interactive NWS(iNWS) Warning Alert SMS Text and Email Messaging Services via Mobile Device Technologies The National Weather Service (NWS) is responsible for providing weather warnings and alerts in a timely and effective manner to support the protection of life and property. The NWS must provide this information to an increasingly mobile user community who are utilizing rapidly evolving technologies for accessing Internet content via mobile wireless devices. In response to this, the NWS is developing weather warning messaging services that leverage mobile device technologies such as Personal Digital Assistants (PDA) and cell phones, in order to better serve NWS core partners(see footnote 1). The NWS Western Region (WR) has developed a real-time, warning messaging service adapted to the unique characteristics of cellular phones and mobile devices. This service has been named Mobile Decision Support Services (MDSS) interactive NWS (iNWS). Users who subscribe can configure their user profile (via an interactive web page) to receive alerts for weather and environmental warnings, watches and advisories via Short Message Service (SMS) text messages or email, as they occur. This capability is provided on the MDSS (iNWS) webpage through an application called “iNWS Mobile Alerting”. “iNWS Mobile Alerting” provides the user the option to choose which class/classes of NWS products (hydrologic, marine, severe weather, etc.)to be alerted for. “iNWS Mobile Alerting” also allows the user to define specific alert areas by city, state, line or point and the recently adopted polygon for defining short fused NWS watches and warnings. SMS text and email alerts will only be sent to users when an alert falls within the user’s configured area of interest The SMS text and email alert provides a short headline and embedded hyperlink which the user can select to see additional multimedia information (including graphics and images relevant to the particular weather event). This additional information may include products currently available on the NWS Website or products generated specifically to support decision making by NWS core partners. MDSS (iNWS) services are provided via a web page Currently, only “iNWS Mobile Alerting” is being provided as an experimental service to NWS core partners in preparation for a decision on operational implementation. In future phases of this project in addition to the experimental service documented in this SDD, the web page may link to other mobile services that are already operational such as NWS web services via wireless technologies (see NWS web services via wireless technologies SDD) as well as additional experimental services. The national experimental MDSS (iNWS) SDD supersedes the regional experimental: NWS Warning Alert Messaging Services via Mobile Device Technologies SDD issued in November 2007. The regional experimental service was previously provided by NWS WR to the general public. In August 2009, the NWS approved a phased approach toward developing a standardized, baseline national mobile decision support service (see attached NWS Decision Memorandum, August, 2009) with the initial focus on NWS core partners. The experimental MDSS (iNWS) is now available as a national experimental service for NWS core partners only. 1 NWS core partners include (1) Members of the Emergency Management community at all levels of government;Federal, State, Local and tribal. Other members of this community include: safety and emergency personnel, from universities or other entities with large populations, whose roles are similar to the public safety officials. (2) Other government agencies: specific government partners NWS requires close coordination with, e.g. FAA officials (for NWS Center Weather Service Units) and water and land management officials (for NWS River Forecast Centers).(3) Members of the Electronic Media: parties who operate systems that routinely provide weather and water warning information rapidly to a significant part of the population served by the NWS. Andy Edman 2010-07-20
Experimental Modernized Open Lakes Forecast for the Great Lakes This experimental enhancement to the Open Lakes Forecast will run parallel with the existing Open Lakes Forecast for the open lake areas on the Great Lakes. The product will provide advance notice to mariners of forecast weather, wind, and wave conditions in a tabular format. This format has been part of a Great Lakes Harmonization team between NWS and Environment Canada and is intended to test a product which can be created on bothe sides of the lakes and by both countries. Brian Hirsch 2015-02-05

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