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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 The GFS superceded the AVN and MRF models, on which it is largely based.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.
08:52 EST Melbourne has just chilled to 2.3 degrees, its coldest morning in five years and its not likely to become much warmer for at least a week.