Eta Model. ground. ground. Hybrid and Eta Coordinates. Ptop. Ptop. = 0. Pressure domain. = 0. Sigma domain. = 1. MSL. = 1. Horizontal resolution of 12 km. 12-km terrain. WRF Model Family. A Tale of Two Dynamical Cores. Why WRF?.
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Hybrid and Eta Coordinates
A Tale of Two Dynamical Cores
Standard Physics Interface
WRF Modeling System
Top-level “Driver” layer 2001)
Isolates computer architecture concerns
Manages execution over multiple nested domains
Provides top level control over parallelism
Specific calls to parallel mechanisms
Low-Level “Model” layer
Performs actual model computations
Scientists insulated from parallelism
General, fully reusable
Model LayerWRF Hierarchical Software Architecture
The National Weather Service dropped Eta ( old NAM-North American mesoscale run) in June 2006 and replace by WRF NMM (new NAM).
The Air Force is now switching from MM5 to WRF ARW.
Most universities using WRF ARW
WRF-NMM American mesoscale run) in June 2006 and replace by WRF NMM (new NAM).