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National Weather Service Houston/Galveston

Assessing the Impact of SPoRT Datasets Utilizing a local WRF. National Weather Service Houston/Galveston. Lance Wood Science and Operations Officer. Workstation Cluster: Two Dell Precision 690 Workstations Intel Quad Xeon Processor with four 2.33 GHz CPUs (8 CPUs) RAM: 4 GB OS: RHEL 5.4

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National Weather Service Houston/Galveston

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  1. Assessing the Impact of SPoRT Datasets Utilizing a local WRF National Weather Service Houston/Galveston Lance Wood Science and Operations Officer

  2. Workstation Cluster: Two Dell Precision 690 Workstations Intel Quad Xeon Processor with four 2.33 GHz CPUs (8 CPUs) RAM: 4 GB OS: RHEL 5.4 Model: WRF EMS v.3.0.1 beta2 Dimension: 129 X 129 Spacing: 4 KM Levels: 35 Length: 30 HR Timestep: 24 seconds Initialized with: NAM218 2 runs every 6 hours (00, 06, 12, 18 UTC) First run utilizes MODIS SST Second run utilizes RTG SST HR Only testing MODIS SST HGX Local WRF (Winter 2009-2010)

  3. Workstation Cluster: Two Dell Precision 690 Workstations Intel Quad Xeon Processor with four 2.33 GHz CPUs (8 CPUs) RAM: 4 GB OS: RHEL 5.4 Model: WRF EMS v.3.1.1.5.1 Dimension: 150X 150 (larger) Spacing: 4 KM Levels: 35 Length: 36 HR (6 hours longer) Timestep: 24 seconds Initialized with: NAM218 2 runs every 12 hours (00,12 UTC) (fewer runs) First run utilizes SPoRT Composite SST, NASA LIS Second run utilizes RTG SST HR, NAM PTILE Testing SPoRT Composite SST, NASA LIS HGX Local WRF (July-August 2011)

  4. Workstation Cluster: Two Dell Precision 690 Workstations Intel Quad Xeon Processor with four 2.33 GHz CPUs (8 CPUs) RAM: 4 GB OS: RHEL 5.4 Model: WRF EMS v.3.1.1.5.1 Dimension: 98 X 133 (smaller) Spacing: 3 KM Levels: 40 Length: 24 HR (12 hours shorter) Timestep: 50 seconds Initialized with: GFS 4 runs every 6 hours (00, 06,12, 18 UTC) HGX/MOB run utilizes SPoRTSST, LIS, GVF SPoRT provides control run (6Z) ! Testing SST, LIS, GVF and at two sites (HGX, MOB) HGX Local WRF (November 2011 - Present)

  5. WFO Houston/Galveston Forecast AreaMost of Southeast Texas

  6. Summer July-August 2011: Winter 2009-2010: • Focused on the seabreezeand convection in general. • Examined surface dew point, winds, temperatures. • Examined WRF forecast reflectivity and compared to the observed reflectivity. • Focused at different flow regimes (onshore - WAA, offshore- CAA, near coast surface low development ). • Examined surface temps and winds.

  7. Seabreeze • Orientation/timing similar across coastal zones. • The SPoRT SST/LIS initialized WRF was slightly faster moving the boundary well inland, and appeared to be more accurate. • Can have affect on convection developing well inland in the vicinity of the northward advancing boundary.

  8. SPoRT WRF Control WRF August 12 8 PM

  9. August 12 9 PM

  10. August 12 10 PM

  11. Convection • In general, both versions of the WRF models tended to over develop convection on non-active days, especially in west/southwest areas that were often strongly capped. • Both versions had some timing issues, but in general, provide useful guidance to forecasters, particularly on the possible degree of coverage. • The SPoRTSST/LIS initialized WRF was better on most active convective days.

  12. Some convective examples…. SPoRT WRF Control WRF August 10th 1 PM August 10th 5 PM

  13. Control WRF SPoRT WRF August 12th 5 PM

  14. August 12th 6 PM

  15. August 12th 7 PM

  16. Summer 2011 - It was HOT !!

  17. Southern Region Modeling Collaboration (SPoRT, WFO Mobile, WFO Houston/Galveston) Develop a methodology for an organized, modeling collaboration effort that can expand to other WFOs. Targeting two primary forecast challenges of interest: heavyprecipitation, and convective initiation. Produce experimental (with SPoRT data) and control forecasts (no SPoRT data) that are similar in dynamical core, initialization, and physics. Real-time control run provided by SPoRT, as well as hard drive for local WRF archive. SPoRT assists with model sensitivity comparisons by examining other physics packages for specific events related to the forecast challenges. SPoRT provides expertise with MET (Model Evaluation Tools) package for quantitative evaluation.

  18. November 8th 2011 – Severe and Heavy Rainfall Case - 11AM SPoRT WRF First case with SR Modeing Collaboration configuration in place

  19. November 8th 2011 – Severe and Heavy Rainfall Case – 1 PM Developing supercell from SPoRT WRF lining up with reality! EF1 Tornado occurred at Kingwood, Texas at 137 PM

  20. November 8th 2011 – Severe and Heavy Rainfall Case – 2 PM

  21. Questions ? Thanks for support from: Mark Keehn, Scott Overpeck (WFO HGX) Brad Zavodsky, Jonathan Case, Andrew Molthan (SPoRT) Jeffrey Medlin (WFO MOB)

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