© 2014 The MITRE Corporation. All rights reserved. Alex Tien, Christine Taylor, Craig Wanke Using Ensemble Forecasts to Support NAS Strategic Planning.

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© 2014 The MITRE Corporation. All rights reserved. Alex Tien, Christine Taylor, Craig Wanke Using Ensemble Forecasts to Support NAS Strategic Planning Center for Advanced Aviation System Development Friends and Partners in Aviation Weather Forum NBAA Business Aviation Convention & Exhibition 2014 Orlando, FL October 22, 2014 Approved for Public Release; Distribution Unlimited. Case Number

| 2 || 2 | © 2014 The MITRE Corporation. All rights reserved. Strategic Planning and Flow Contingency Management (FCM) Flow Contingency Management (FCM) is developed to provide quantitative assessment of weather impact. NAS strategic planning aims to develop a mitigation plan for severe weather event hours in advance. Ensemble forecast can provide a range of possible scenarios for mitigation planning. FCM modeling components:  Translate forecast into capacity reduction  Simulate weather-traffic interaction  Plan for delay mitigation strategies Picture Source: NOAA AWC Picture Source: MITRE

| 3 || 3 | © 2014 The MITRE Corporation. All rights reserved. Rep. Scenario 1 High impact over ZOB and ZAU Rep. Scenario 1 High impact over ZOB and ZAU Rep. Scenario 2 High impact on NY terminal airspace Rep. Scenario 2 High impact on NY terminal airspace Rep. Scenario 3 Medium impact on ORD arrivals Rep. Scenario 3 Medium impact on ORD arrivals Rep. Scenario 4 Low impact Rep. Scenario 4 Low impact Representative Scenarios Scenario Analysis Methodology Generate Weather-Impact Scenarios Translate weather forecast into NAS capacity loss Simulate weather-traffic interaction in FCM Evaluate Scenarios with Impact Metrics Collect sector delays, key airport delays Construct a quantitative representation of scenarios Apply a Clustering Algorithm Identify Representative Scenarios Analyze Multiple Weather-Impact Scenarios Plan 1 AFP on A05, GDPs on NY Airports Plan 1 AFP on A05, GDPs on NY Airports Plan 2 GDPs on NY Airports Plan 2 GDPs on NY Airports Plan 3 GDP on ORD Plan 3 GDP on ORD Plan 4 Do Nothing Plan 4 Do Nothing Traffic Management Initiatives Forecast #2 Forecast #1 Forecast #21 … … 21 Weather Forecasts from Short Range Ensemble Forecast (SREF) Picture Source: MITRE

| 4 || 4 | © 2014 The MITRE Corporation. All rights reserved. June 27, 2013 Observed Weather (CIWS VIL3+ Coverage) SREF Forecast at 0900Z (21 Scenarios of Hourly Precipitation) ZDC ZJX ZTL ZOB ZID ZNY ZAU ZBW Picture Source: MITRE Hourly precipitation aggregated over one day for illustration.

| 5 || 5 | © 2014 The MITRE Corporation. All rights reserved. Generate Weather-Impact Scenarios via FCM Simulation Airport Delays of 21 Scenarios (LGA, JFK, EWR, ATL, ORD, DTW, and PHL) Sector Delays of 21 Scenarios Picture Source: MITRE

| 6 || 6 | © 2014 The MITRE Corporation. All rights reserved. Identify Representative Weather-Impact Scenarios 9.5% Likelihood; High Impact 33% Likelihood; Medium Impact 9.5% Likelihood; Medium Impact 9.5% Likelihood; High Impact 4.8% Likelihood; Highest Impact 33% Likelihood; Low Impact Picture Source: MITRE

| 7 || 7 | © 2014 The MITRE Corporation. All rights reserved. Design Traffic Management Initiatives  “Optimize” TMI plans for Representative Scenarios Optimization capability was developed to efficiently search the combination of TMI parameters. The objective function is set as ground delay + 2* sector delays. TMI TypeStart Time (UTC)Duration (Hr)Hourly Rate GDPEWR{16, 17, 18, 19, 20, 21, 22}{8, 9, 10, 11, 12, 13, 14}{20, 25, 30, 35, 40} GDPLGA{16, 17, 18, 19, 20, 21, 22}{8, 9, 10, 11, 12, 13, 14}{15,20,25, 30, 35} GDPORD{20, 21, 22, 23, 00, 01}{2, 3, 4, 5, 6, 7, 8}{70, 75, 80, 85, 90, 95, 100} GDPATL{18, 19, 20, 21, 22}{3, 4, 5, 6, 7, 8}{70, 75, 80, 85, 90, 95, 100} AFPFCAA05{18, 20, 22, 00}{6, 8, 10, 12, 14}{50,60,70, 80, 90, 100} AFPFCAA08{18, 20, 22, 00}{6, 8, 10, 12, 14}{70, 80, 90, 100, 110, 120} Picture Source: MITRE

| 8 || 8 | © 2014 The MITRE Corporation. All rights reserved. Compare TMI Plans TMI Parameters For Each Optimized Plan Plan for Scenario 14* (Highest Impact) Plan for Scenario 01 (High Impact) Plan for Scenario 11 (High Impact) Plan for Scenario 08 (Medium Impact) Plan for Scenario 04 (Medium Impact) Plan for Scenario 16 (Low Impact) EWR GDP S**: 22 D: 10 R: 25 S: 21 D: 11 R: 30 S: 22 D: 9 R: 40 S: 22 D: 10 R: 30 S: 22 D: 10 R: 35 S: 21 D: 10 R: 40 LGA GDP S: 19 D: 13 R: 20 S:22 D: 10 R: 35 S: 22 D: 9 R: ORD GDP S: 23 D: 4 R: 80 S: 23 D: 3 R: 75 S: 00 D: 4 R: 95 S: 01 D: 4 R: ATL GDP -***--- S: 22 D: 4 R: 90 - AFP 05 S: 18 D: 12 R: AFP 08 S: 00 D: 8 R: 120 S: 00 D: 8 R: 110 S: 22 D: 10 R: S: 00 D: 8 R: 100 * Plan 01 is a shorthand note for the plan optimized for Scenario 01, and so forth for other plans. ** S for start hour in Zulu; D for duration in hours; R for hourly rate. *** Empty cell in the table means that the TMI is not part of the optimized strategy.

| 9 || 9 | © 2014 The MITRE Corporation. All rights reserved. Evaluate Clustering Results and TMI Plans  The greatest cost reduction percentages correlate with the plan optimized for the corresponding scenario. Representative Scenarios Likelihood of Occurrence Baseline System Cost Function Value (in Min.) Cost Reduction (%) Under Plan 14 Under Plan 01 Under Plan 11 Under Plan 08 Under Plan 04 Under Plan 16 Scenario 14 (Highest Impact) 4.8%2,387, %-16.48%-13.69%-10.49%-9.16%-7.66% Scenario 01 (High Impact) 9.5%1,547, %-24.77%-19.38%-19.25%-14.86%-11.44% Scenario 11 (High Impact) 9.5%1,346, %-17.99%-20.50%-12.28%-12.08%-13.32% Scenario 08 (Med. Impact) 9.5%1,079, %-22.22%-22.09%-22.89%-22.06%-20.46% Scenario 04 (Med. Impact) 33.3%942, %-9.03%-8.97%-10.91%-11.55%-11.09% Scenario 16 (Low Impact) 33.3%839, %-6.07%-7.39%-8.37%-8.89%-10.94%

| 10 | © 2014 The MITRE Corporation. All rights reserved. Concluding Remarks  SREF provides a range of possible weather futures for supporting NAS strategic planning.  Methodology for analyzing multiple weather-impact scenarios was proposed. –Evaluate impact  identify representative scenarios  design delay mitigation plans.  The performance of the clustering results was examined with the TMI plans designed specifically for the representative scenarios. –Representative scenarios were better mitigated by the TMI plans optimized for them.  Next steps: –Explore metrics reflecting stakeholder concerns. –More weather days can be analyzed to fine-tune model parameters. –Develop methodology for deriving a current decision point plan.

| 11 | © 2014 The MITRE Corporation. All rights reserved. Publications  Tien, S-L, Taylor, C., and Wanke, C., “Representative Weather-Impact Scenarios for Strategic Traffic Flow Planning,” AIAA Aircraft Technology, Integration, and Operations Conference, Atlanta, GA, June  Tien, S-L, Taylor, C., and Wanke, C., “Identifying Representative Weather-Impact Scenarios for Flow Contingency Management,” AIAA Aircraft Technology, Integration, and Operations Conference, Los Angeles, CA, August  Taylor, C., Masek, T., and Wanke, C., “Designing Strategic Planning Strategies using Multi-Objective Genetic Algorithms,” AIAA Aviation Technology, Integration, and Operations Conference, June  Taylor, C., Wanke, C., Wan, Y., Roy, S., “A Decision Support Tool for Flow Contingency Management”, AIAA Guidance, Navigation, and Control Conference, Minneapolis, MN, August, Contact: Alex Tien

© 2014 The MITRE Corporation. All rights reserved. | 12 | Thank You!

| 13 | © 2014 The MITRE Corporation. All rights reserved. NOTICE This work was produced for the U.S. Government under Contract DTFAWA-10-C and is subject to Federal Aviation Administration Acquisition Management System Clause , Rights In Data- General, Alt. III and Alt. IV (Oct. 1996). The contents of this document reflect the views of the author and The MITRE Corporation and do not necessarily reflect the views of the FAA or the DOT. Neither the Federal Aviation Administration nor the Department of Transportation makes any warranty or guarantee, expressed or implied, concerning the content or accuracy of these views.  2014 The MITRE Corporation. All Rights Reserved.