The Global Forecast System (GFS) is a global numerical weather prediction system containing a global computer model and variational analysis run by the U.S. National Weather Service (NWS).
The mathematical model is run four times a day, and produces forecasts for up to 16 days in advance, with decreased spatial resolution after 10 days. The model is a spectral model with a resolution of T1534 from 0 to 240 hours (0-10 days) and T574 from 240 to 384 hours (10-16 days). In the vertical, the model is divided into 64 layers and temporally, it produces forecast output every hour for the first 12 hours, every 3 hours out to 10 days, and every 12 hours after that.
Global Branch Chief - Vijay Tallapragada
Website and Experiment Help - Kate Howard
RFC #3526 – GFS v14.0.0 - The Global Forecast System (GFS) is being upgraded to v14.0.0
Implemented on July 19 effective with the 1200Z cycle. Major changes include:
- Implementing the Global Spectral Model (GSM) in the NEMS framework
- Replacing spectral output files with nemsio binary files
- Upgrade deep and shallow convection schemes
- Changes to the GDAS and Tropical Storm Relocation
- Changes to post-processing and output products.
Full details of the upgrade can be found at: http://www.nws.noaa.gov/os/notification/scn17-67gfsupgrade.htm