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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 The GFS superceded the AVN and MRF models, on which it is largely based.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.
18:16 EST South Australia is ending August with a few warmer nights and days but this month will still go down as the frostiest on record for most of the state.