National Wind Compression Tool to Support the NAS



New Mission Need or Requirement RequestNational Wind Compression Tool to Support the NASDate: 11/30/2016(Submitted 12/12/2016)CONTACT INFORMATIONPlease feel free to add additional contacts as necessary.Request OriginatorNoelle RunyanNoelle.runyan@(631) 244-0122Office: NWS Eastern Region HeadquartersDate: 11/30/2016Local Office / Management Concurrence (CaRDS Tier 1 Clearance)William Baumanwilliam.bauman@(301) 427-9782Office: NWSH/AFS)/AFS2/AFS24Date: 11/30/2016Statement of Mission Need or RequirementMission Need or RequirementThere is a need for a nationally supported Aircraft Traffic Compression tool to support the National Airspace System (NAS). Aircraft traffic compression occurs when aircraft Flying Standard Terminal Arrivals (STARS), following one behind the other, lose adequate horizontal separation from each other. The conditions that create this situation are usually a rapid change in wind direction and speed with respect to altitude and between the two aircraft. Traffic 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. A compression event necessitates the slowing of the airport arrival rate, which could affect the efficiency of the NAS. This tool is intended to support a common operating picture, and will be used by Center Weather Service Unit (CWSU) forecasters and National Aviation Meteorologists (NAMs) when conducting IDSS briefings for FAA Flight Controllers at Air Route Traffic Control Centers (ARTCCs), Terminal Radar Control facilities (TRACONs) and the Air Traffic Control System Command Center (ATCSCC).Time SensitivityAircraft Traffic Compression graphics are currently being evaluated on a local level at two CWSUs and other locations have requested to use the graphics.. The use of compression graphics could lead to an immediate cost savings across the NAS.Existing Operational GapsThere is currently no nationally supported graphic, although compression graphics are currently being evaluated on a local level at the CWSUs in Dallas-Ft Worth (ZFW) and New York (ZNY). As additional CWSUs realize a need to provide this graphic to their respective facilities it will become increasingly necessary to create these graphics on a national platform. IDSS briefings will continue to be performed by local CWSU Forecasters. The local compression graphics used at ZFW and ZNY were evaluated by the Aviation SPT with a recommendation to continue using those products locally as experimental, while in parallel, to request a national compression graphic via CaRDS.Justification and Benefits to the NWSStrategic Drivers and MandatesIf available, link the request to a specific initiative, mandate, law, stakeholder need or other justification. Table 2.1: Justification Does the requirement address a mandate by NOAA, DOC, OMB, Executive Order, or Law?Y / NIs the requirement needed to satisfy a specific external organization’s needs?Y / NDoes the requirement address a specific DOC, NOAA, or NWS strategic initiative? Y / NExplanation of justification:49 U.S. Code 44720 - Meteorological services-FAA makes recommendations to DOC on providing meteorological services necessary for the safe and efficient movement of aircraft in air commerce.Annex 3 to the Convention on International Civil AviationInteragency agreements (IA)-NWS/FAA IA for Decision Support Services for Air Traffic ManagementWeatherReady Nation (WRN) goals-1: Improve weather decision services for events that threaten lives and livelihoods-4: Improve sector-relevant information in support of economic productivity-6: Sustain a highly-skilled, professional workforce equipped with the training, tools, and infrastructure to meet our mission.BenefitsIdentify how satisfying the request will benefit the NWS, partners, the public, or other stakeholders. Table 2.2: Benefit to the NWSDescribe how the request will benefit NWS’ mission to protect life and property.Describe how the request will help the NWS better serve our partners and the public.Describe how the request will improve how NWS operates.Describe how the request will help NWS be a better steward of government resources (e.g., time or money).Explanation of benefits to NWS:Providing compression information in the FAA Controller IDSS Briefings, when applicable, will assist the FAA in providing more efficient management of the nation’s airspace. More efficient management of the nation’s airspace would lead to a cost savings across the NAS thereby enhancing the national economy. National support of the product will also support a consistent IDSS message across NWS service outlets. National Service ProgramIdentify the most appropriate Analyze, Forecast and Support Office National Service Program to vet and address this request.Table 3.1: Identification of lead National Service ProgramProgram NameXProgram NameXProgram NameXAviation XTropicalPublicFire WeatherWinter WeatherSpace WeatherMarineClimateTsunamiSevere WeatherWater ResourcesOverarching (broad cross-cutting)Estimated Resource NeedsProvide an estimate of resource needs associated with the request. Note - This is an opportunity to provide a general idea of resources needed. You may include a proposed solution; however it is not to be considered as the 'only solution'. Validation of the requirement for this request does not imply approval of proposed solution. Solution analysis will take place after requirement is validated.Needed resources include:Personnel to evaluate which of the two compression algorithms to use, develop a new algorithm, or a hybrid solution.STI (AWC) to develop the background info needed at additional airports for input into the equations, and to host the web graphics.There are currently two graphics in use. The equations and spreadsheet used in the background to make each of these graphics are the same. Examples of the graphics can be viewed below or at the following URLs: graphic is annotated highlighting the area of impacted compression shaded red to indicate the altitudes being affected by compression. ?(Internal note: need to get a version that displays correctly)ZNY uses a web graphic to highlight the impacts (Low, Moderate, Significant, Extreme) at each quadrant at N90 and PHL:within a tactical time frame:, and a strategic/planning time frame , ................
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