NCEP is replacing the NAM Eta model with a version of NAM WRF on June 20,
2006. COMET has created The NCEP NAM WRF Model (Short Version) Webcast to describe changes in the model and analysis system, highlighting
how these changes impact the model forecast. (A full version of this Webcast
is also available.) The new Gridpoint Statistical Interpolation
(GSI) analysis introduced with this change will also be implemented in the
Real-Time Mesoscale Analysis later in 2006 and in the GFS, RUC, and
Hurricane-WRF models over the next two years. In addition to discussing the
GSI, the Webcast covers the change in vertical coordinate and terrain,
nonhydrostatic effects, a change in the precipitation type algorithm, and
some background on the WRF concept and the previous operational uses of the
NCEP Nonhydrostatic Mesoscale Model.
At the end of this Webcast, you will be able to
• Describe the WRF concept and how it differs from other NWP model implementations
• Describe how GSI improves the analysis
• Define and describe the use of anisotropic background error covariances
• State differences between the vertical coordinate systems in Eta and NMM and how they affect the forecast
• Anticipate nonhydrostatic effects on model forecasts
• Describe several new WRF output variables, including precipitation type and simulated radar reflectivity
NCEP, NAM Eta model, NAM WRF Model
July 2014: The NAM-WRF was replaced by the NAM-NMMB in 2012. We added a new model column to the matrix at http://www.meted.ucar.edu/nwp/pcu2/ and made a video introducing the new model and it is available on the same page.
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