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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 The GFS superceded the AVN and MRF models, on which it is largely based.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.
16:25 EDT A warm air mass moving eastward ahead of a trough over the past few days finally reached Sydney yesterday, bringing temperatures in the low forties to much of the west.