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 The GFS superceded the AVN and MRF models, on which it is largely based.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.
10:40 EDT Heat has scorched Australia's west and south in the last two weeks, but now it is finally time for Sydney to endure the stifling temperatures.