Local Models at WFO Charleston
The National Weather Service in Charleston is currently running the Weather Research Environmental Modeling System (WRF-EMS), a full featured numerical weather prediction package that incorporates two dynamic cores. The first core is the Advanced Research WRF (ARW) made available from the National Center for Atmospheric Research (NCAR), and the second is the National Center for Environmental Predictions' non-hydrostatic mesoscale model (NMM). The WRF-EMS Package allows for a wide range of configuration, physics, micro-physics, and parameterization schemes. Below is a general description of how the models are configured to run at the National Weather Service in Charleston. Both models are initialized using the NCEP North American NAM12.
Description of the WRF-ARW
The WRF-ARW is executed 8 times per day as a one-way nest. . The model is initialized by a Local Analysis and Prediction System (LAPS) in "hot start" mode. The boundaries are initialized with NCEP's North American Mesoscale (NAM) model at 15 KM resolution. Output for two domains are available, a 15KM outer domain, and a 5KM nested domain centered on West Virginia.
Domain & Run Information for the WRF-ARW: Primary Time Step : Adaptive Adaptive Step to Output Time : Yes Yes Grid dimensions (NX x NY) : 135 x 135 136 x 136 Vertical Layers (NZ) : 45 45 Grid Spacing : 15.00km 5.00 km Top of Model Atmosphere : 50mb 50mb Parent Domain : NA Domain 01 Model Physics Dynamics : Non-Hydrostatic Non-Hydrostatic Cumulus Scheme : Kain-Fritsch None Microphysics Scheme : Ferrier Microphysics Ferrier Microphysics PBL Scheme : Yonsei University Yonsei University Land Surface Scheme : Noah 4-Layer LSM Noah 4-Layer LSM Number Soil Layers : 4 4 Surface Layer Physics : Monin-Obukhov Monin-Obukhov M-O Heat and Moisture : Surface Fluxes On Surface Fluxes On M-O Snow-cover Effects : Included Included Long Wave Radiation : RRTMG Scheme RRTMG Scheme Short Wave Radiation : RRTMG Scheme RRTMG Scheme ARW Core Model Dynamics Dynamics : Non-Hydrostatic Non-Hydrostatic Gravity Wave Drag : Off Off Time-Integration Scheme : Runge-Kutta 3rd Order Runge-Kutta 3rd Order Diffusion Scheme : Simple Diffusion Simple Diffusion 6th-order Diffusion : No 6th-Order Diffusion No 6th-Order Diffusion Eddy Coefficient Scheme : 2D 1st Order Closure 2D 1st Order Closure Damping Option : W-Rayleigh W-Rayleigh Damping Depth from Top : 5 Km 5 Km Damping Coefficient : 0.12 0.12 W Damping : W Damping On W Damping On Horiz Momentum Advection : 5th Order 5th Order Horiz Scalar Advection : 5th Order 5th Order Vert Momentum Advection : 3rd Order 3rd Order Vert Scalar Advection : 3rd Order 3rd Order Sound Time Step Ratio : Automatic Automatic Moisture Advection Option : Positive-Definite Positive-Definite Scalar Advection Option : Positive-Definite Positive-Definite TKE Advection Option : Positive-Definite Positive-Definite
Description of the WRF-NMM
The WRF-NMM model is executed 8 times per day for a 3 hour cycle start time. The model is initialized by a Local Analysis and Prediction System (LAPS) in "hot start" mode. In addition, this domain executes with the Digital Filter Initialization (DFI) option turned on. The boundaries are initialized with NCEP's North American Mesoscale Model (NAM) at 12 KM resolution. Output from a single domain with a resolution of 5 KM is available.
Domain & Run Information for the WRF-NMM Primary Time Step : 10.4 Seconds Grid dimensions (NX x NY) : 176 x 330 Vertical Layers (NZ) : 45 Grid Spacing : 4.96 km Top of Model Atmosphere : 50mb Parent Domain : NA Digital Filter Initialization Information DFI Method : DF Launch DFI Filter : Dolph DFI Backstop : 40 Minutes DFI Forwardstop : 20 Minutes DFI Cut Off : 20 Minutes Model Physics Dynamics : Non-Hydrostatic Cumulus Scheme : None Microphysics Scheme : Ferrier Microphysics PBL Scheme : Mellor-Yamada-Janjic Land Surface Scheme : Noah 4-Layer LSM Number Soil Layers : 4 Surface Layer Physics : Monin-Obukhov (Janjic) Long Wave Radiation : GFDL Long Wave Radiation Short Wave Radiation : GFDL Short Wave Radiation NMM Core Model Dynamics Dynamics : Non-Hydrostatic Gravity Wave Drag : Off Time-Integration : Horizontally propagating fast-waves - Forward-backward scheme : Vertically propagating sound waves - Implicit scheme Horizontal : Adams-Bashforth Vertical : Crank-Nicholson Advection of T, U, and V Horizontal : Energy and entropy conserving, quadratic conservative, 2nd order Vertical : Quadratic conservative, 2nd Order TKE and Moisture Adv : Explicit, Upstream, Flux-Corrected, Positive Definite, Conservative Vertical Diffusion : Handled by PBL and Surface Layer Schemes Lateral Diffusion : Smagorinsky Non-linear Approach Divergence Damping : Horizontal component of divergence is damped