What is the exact difference between GFS 0.25 and GDAS 0.25 data which is available in http://nomads.ncep.noaa.gov/.

And are the GFS 0.5 and 1 degree data available in the above url and here the same?


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From this page: https://www.emc.ncep.noaa.gov/emc/pages/numerical_forecast_systems/gfs.php

As I understand, The Global Data Assimilation System (GDAS) is just that, an assimilation system. It takes in real-world data from sensors across the globe and bins it into a regular grid. It is used then as an input or starting guess to the Global Forecast System (GFS). Because it is using real-world data, it only works going up to the current time.

The GFS takes the GDAS as a starting point, and then using physics equations and other methods it forecasts what conditions will be like hours or days from the starting point.


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