WRF ARW User's Guide - MMM - UCAR

Table of Contents
Chapter 5: WRF Model
• Introduction
• Installing WRF
• Running WRF
o Idealized Case
o Real Data Case
o Restart Run
o Two-Way Nested Runs
o One-Way Nested Run Using ndown
o Moving Nested Run
o Three-dimensional Analysis Nudging
o Observation Nudging
o Global Run
o DFI Run
o Adaptive Time Stepping
o Output Time Series
o Using IO Quilting
• Check Output
• Trouble Shooting
• Physics and Dynamics Options
• Description of Namelist Variables
• WRF Output Fields
Introduction
MODEL
The WRF model is a fully compressible, and nonhydrostatic model (with a runtime
hydrostatic option). Its vertical coordinate is a terrain-following hydrostatic pressure
coordinate. The grid staggering is the Arakawa C-grid. The model uses the Runge-Kutta
2nd and 3rd order time integration schemes, and 2nd to 6th order advection schemes in
both horizontal and vertical. It uses a time-split small step for acoustic and gravity-wave
modes. The dynamics conserves scalar variables.
The WRF model code contains several initialization programs (ideal.exe and real.exe; see
Chapter 4), a numerical integration program (wrf.exe), and a program to do one-way
nesting (ndown.exe). The WRF model Version 3 supports a variety of capabilities. These
include
• Real-data and idealized simulations
WRF-ARW V3: User’s Guide 5-1