Definition of GFS


GFS model stands for the Global Forecast System model...the newest model version of what used to be called the AVN/MRF model (AVN=aviation, MRF= medium range forecast model). The GFS is a global spectral model and predicts for the many regions of the world. It's a relatively coarse model, not as fine a resolution as the NAM described below. Another subset of the model, the GFSX (X for extended) also predicts over longer ranges, as much as 144 hours to 384 hours into the future. It's run 4 times a day. While not as 'fine' a resolution as the NAM model, the GFS model has wonderful features and is the one I usually bet on.

(I had to look it up myself...)

[link to theweatherguy.net]