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WRF Progress at NCEP in 2002

WRF Progress at NCEP in 2002. Steve Lord led effort to establish WRF MOA. Implemented the Janjic Nonhydrostatic Meso Model (NMM) in 8 km HiResWindow and in 4km On-Call Emergency Response (OCER) system - establishing NCEP’s baseline for WRF.

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WRF Progress at NCEP in 2002

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  1. WRF Progress at NCEP in 2002 • Steve Lord led effort to establish WRF MOA. • Implemented the Janjic Nonhydrostatic Meso Model (NMM) in 8 km HiResWindow and in 4km On-Call Emergency Response (OCER) system - establishing NCEP’s baseline for WRF. • Made available 30-day retrospective data sets (BUFR & GRIB) suitable for WRF testing. • Adapted (with NSSL) NCEP operational NMM postprocessor to WRF standards, issued code and users’ guide.

  2. WRF Progress at NCEP in 2002 • Converted Eta & NMM dynamics and all physics modules to WRF coding standards. • Ensured all converted code reproduced NCEP control version results (VERY IMPORTANT). • Final step to wrap NMM under WRF modeling infrastructure underway - implementation scheduled for 4Q FY2003. • Made EMC’s grid-to-obs verification codes available with users’ guide. • Unification (with AFWA) of Land-Surface Model in WRF framework nearing completion.

  3. WRF Progress at NCEP in 2002 • NCEP led WG#4 developed beta version of WRF 3DVAR for testing (nearly ready for release) • NCEP led WG#9 is proactive in setting needs for testing and infrastructure efficiencies. • NCEP led WG#12 establishes NCEP’s prepared BUFR observation set for use in WRF 3DVAR and in WRF verification using NCEP’s code. • Duane Stevens (University of Hawaii) at NCEP working with WRF teams (application of Semi-Lagrangian to hurricanes and evaluation of NCAR Eulerian vs NMM over Hawaii)

  4. WRF Progress at NCEP in 2002 • Established Parallel system to run NCAR Eulerian mass model with NCEP physics in identical 8 km HiResWindow configuration • 4 large domain nests (Western,Central&Eastern CONUS + Alaska) • 2 small domain nests (Hawaii and Puerto Rico) • Semi-Lagrangian semi-implicit dynamic core: • Generalized vertical coordinate embodies pure sigma and pure isentropic and ALL hybrids in between • Cascade interpolation allowing forward trajectories • High-order accuracy compact difference schemes • Non-reflective top boundary condition • All development within WRF infrastructure

  5. WRF Development at NCEP/EMC • FY03 Funding • $1.5 M • $700 K NWS base • $800 K External • Effort for FY03 • Total 14.3 PY (Model and Data Assim) • 7.3 PY for development (Semi-Lagrangian, DA) • 7.0 PY for Mesoscale Branch Infrastructure • Setting up and making test runs • NMM benchmark codes and runs • WRF System Test Plan (N. Seaman – PSU)

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