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Joseph G. Sela

Abstract

A model with spectral representation in the horizontal and Arakawa quadratic conserving finite differencing in the vertical is formulated. The model includes a moisture cycle consisting of large-scale condensation processes, as well as a convective parameterization. Interactions with the underlying oceans include evaporation and sensible heating. Orography and surface friction are modeled and a semi-implicit time integration is employed. Experiments with global and hemispheric forecasts are described and evaluated.

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James E. Hoke
,
Norman A. Phillips
,
Geoffrey J. Dimego
,
James J. Tuccillo
, and
Joseph G. Sela

Abstract

The three components of the Regional Analysis and Forecast System (RAFS) of the National Meteorological Center (NMC) are described. This system was implemented in March 1985 to supplement guidance from NMC's limited-area fine-mesh model (LFM), especially for precipitation forecasting. The three components of the RAFS are the regional optimum interpolation analysis, the Baer–Tribbia nonlinear normal mode initialization, and the nested grid model—a grid point, primitive-equation model in sigma coordinates. Postprocessing of model forecasts and plans for system improvement are also discussed.

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