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 The GFS superceded the AVN and MRF models, on which it is largely based.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.
16:37 EDT Farmers in the South Australian Mallee are trying to work out how much damage has been caused by frosts this week.