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Nested Grid Model

The National Centers for Environmental Prediction (NCEP) designed the Regional Analysis and Forecast System (RAFS) to improve numerical guidance for weather predictions over the United States out to 48 hours. The Nested Grid Model (NGM) that makes up the RAFS forecast component provides better spatial resolution (particularly for lower layers on the vertical axis) and uses observations more effectively than the previous limited-area fine-mesh model (LFM).

Product Types

NCEI provides access to archived 2-hourly data from the RAFS NGM.

ModelGrid/ScalePeriod of RecordModel CycleOutput TimestepData Access Links
NGM180km01Jan1991 - 15Apr19972/day: 00 and 12UTC2-hourly, +00 to +48 hoursHAS


Hoke, J.E., N. A. Phillips, G.J. DiMego, J.J. Tuccillo, and J.G. Sela, 1989: The Regional Analysis and Forecast System of the National Meteorological Center. Weather and Forecasting, 4 (323-334)doi:10.1175/1520-0434(1989)004<0323:TRAAFS>2.0.CO;2

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