Model	Forecast Hour	Forecast Parameter
ETA:	00 06 12 18 24 30 36 42 48 60 72 84 Loop All	Surface ->   Temperature ->   Dew Point ->   MSLP/Winds ->   Theta E ->   Precipitation ->   Precip Type Upper Air ->   200mb Winds ->   300mb Winds ->   400mb Winds ->   500mb Winds ->   500mb Temps ->   500mb Vorticity ->   700mb Winds ->   700mb Temps ->   850mb Winds ->   850mb Temps
GFS:	00 06 12 18 24 30 36 42 48 60 72 84 96 108 120 132 144 156 168 180 Loop All	Surface ->   Temperature ->   Max Temp ->   Min Temp ->   Dew Point ->   MSLP/Winds ->   Theta E ->   Precipitation ->   Precip Type Upper Air ->   250mb Winds ->   300mb Winds ->   500mb Winds ->   500mb Temps ->   500mb Vorticity ->   700mb Winds ->   700mb Temps ->   850mb Winds ->   850mb Temps
RUC:	00 01 02 03 06 09 12 Loop All	Surface ->   Temperature ->   Dew Point ->   MSLP/Winds ->   Pressure Tend ->   Theta E ->   Precipitation ->   Precip Type Upper Air ->   200mb Winds ->   250mb Winds ->   300mb Winds ->   500mb Winds ->   500mb Temps ->   700mb Winds ->   700mb Temps ->   850mb Winds ->   850mb Temps

ETA is a large-scale (synoptic) model and was recently extended to provide forecast out to 84 hours. The Global Forecast System (GFS) is a "spectral" numerical model designed to forecast the entire globe for long duration (10 days and beyond). GFS is a new model which replaces the old AVN (AViatioN) or MRF (Medium-Range Forecast) model. The Rapid Update Cycle (RUC) model was created at NOAA-FSL and is run every 3 hours. This model contains the most sophisticated physics of the models run at NCEP and is on par with research numerical models like MM5 (Mesoscale Model 5).