Nested Grid Model

<p>The Nested Grid Model (usually known as NGM for short) was a <a href="/facts/Numerical_weather_prediction/TXdbEfE4">numerical weather prediction</a> model run by the <a href="/facts/National_Centers_for_Environmental_Prediction/hFHpe17S">National Centers for Environmental Prediction</a>, a division of the <a href="/facts/National_Weather_Service/gcWCQRzr">National Weather Service</a>, in the United States. The NGM was, as its name suggested, derived from two levels of grids: a hemispheric-scale grid and a <a href="/facts/Synoptic_scale_meteorology/PMYwbEWA">synoptic-scale</a> grid, the latter of which had a resolution of approximately 90 kilometers. Its most notable feature was that it assumed the <a href="/facts/Hydrostatic_equation/GYu6ljQ0">hydrostatic equation</a>.
</p><p>The NGM debuted in 1987, directly replacing the limited-area fine mesh (LFM) model, which was immediately halted upon the NGM's debut. The NGM was also used to create <a href="/facts/Model_output_statistics/RdTASo0P">model output statistics</a>. Development of the model stopped in 1993. By 2000, the model was seen as obsolete, particularly for <a href="/facts/Mesoscale_meteorology/E0Tdj8SK">mesoscale</a> features that were not hydrostatic, and was scheduled to be superseded by the <a href="/facts/Global_Forecast_System/1V7Cvq5U">Global Forecast System</a> (GFS) in 2001. However, though the NGM ceased widespread use in the early 2000s due to the GFS and improvements in the Eta model (later the <a href="/facts/North_American_Mesoscale_Model/cbcwxsYL">North American Mesoscale Model</a>), and the NGM's short-range LAMP products were phased out in 2006, NGM MOS products continued to be in significant general use (alongside the Eta/NAM and GFS) until March 3, 2009, when the NGM MOS products were discontinued.
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Nested Grid Model open-in-new

Nested Grid Model