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 The GFS superceded the AVN and MRF models, on which it is largely based.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.
15:51 EDT Forecasts still suggest Christmas Day in Australia will be typically hot, humid and thundery in the north, windy in the south, wet in the southeast and dry and warm on the west coast.