Changes to NMC's Regional Analysis and Forecast System

Geoffrey J. DiMego National Meteorological Center, NWS, NOAA, Washington, D.C.

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Kenneth E. Mitchell National Meteorological Center, NWS, NOAA, Washington, D.C.

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Ralph A. Petersen National Meteorological Center, NWS, NOAA, Washington, D.C.

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James E. Hoke National Meteorological Center, NWS, NOAA, Washington, D.C.

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Joseph P. Gerrity National Meteorological Center, NWS, NOAA, Washington, D.C.

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James J. Tuccillo Cray Research Corporation, Calverton, Maryland

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Richard L. Wobus General Sciences Corporation, Reston, Virginia

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Hann-Ming H. Juang General Sciences Corporation, Reston, Virginia

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Abstract

The recent implementation of changes to the National Meteorological Center's (NMC's) Regional Analysis and Forecast System (RAFS) is described. The changes include an expansion of the innermost grids of the nested-grid model (NGM) and the implementation of the Regional Data Assimilation System (RDAS). The new version of the forecast model and a 3-hourly RDAS analysis system were implemented on 7 August 1991. Some results from tests of the revised forecast model and the combined RDAS/NGM system are presented.

Abstract

The recent implementation of changes to the National Meteorological Center's (NMC's) Regional Analysis and Forecast System (RAFS) is described. The changes include an expansion of the innermost grids of the nested-grid model (NGM) and the implementation of the Regional Data Assimilation System (RDAS). The new version of the forecast model and a 3-hourly RDAS analysis system were implemented on 7 August 1991. Some results from tests of the revised forecast model and the combined RDAS/NGM system are presented.

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