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Global Forecast System. The operational numerical weather forecasting model run by NCEP. The GFS superceded the AVN and MRF models, on which it is largely based. Forecast data from the GFS is available out to 180 hours at full resolution and 16 days at a reduced resolution.
15:29 EST There are few things farmers enjoy talking about more than weather, even if it's bad news, but it's not just farmers who have a keen eye on the skies.