|Provider:||National Centers for Environmental Prediction, NOAA (USA)|
|Update frequency:||every 6 hours|
|Resolution:||0.25°, 15.0nm, 27.8km|
|Model duration:||61 forecasts starting at 0 hr, ending at 16 days|
|Parameters:||pressure, wind, wind gust, rain, cloud, temperature, humidity, dew point, convection, vorticity, vertical velocity, precipitable water, visibility, 0C isotherm, 250 mb, 500 mb, 850 mb|
|GRIB model date:||Sat Apr 20 12:00:00 2019 UTC|
|Download date:||Sat Apr 20 16:53:15 2019 UTC|
|Download delay:||4hr 53min|
GFS is the most commonly used weather forecast model and is a good choice for those who are new to using GRIB forecast data. GFS has global coverage and the LuckGrib server provides access to up to 10 days of forecast data.
The following description has been taken directly from the official documentation
The Global Forecast System (GFS) is a weather forecast model produced by the National Centers for Environmental Prediction (NCEP). Dozens of atmospheric and land-soil variables are available through this dataset, from temperatures, winds, and precipitation to soil moisture and atmospheric ozone concentration. The entire globe is covered by the GFS at a base horizontal resolution of 18 miles (28 kilometers) between grid points, which is used by the operational forecasters who predict weather out to 16 days in the future. Horizontal resolution drops to 44 miles (70 kilometers) between grid point for forecasts between one week and two weeks.
The GFS model is a coupled model, composed of four separate models (an atmosphere model, an ocean model, a land/soil model, and a sea ice model), which work together to provide an accurate picture of weather conditions. Changes are regularly made to the GFS model to improve its performance and forecast accuracy. It is a constantly evolving and improving weather model. Gridded data are available for download through the NOAA National Operational Model Archive and Distribution System (NOMADS). Forecast products and more information on GFS are available at the GFS home page.
Prior to January 2003, the GFS was known as the GFS Aviation (AVN) model and the GFS Medium Range Forecast (MRF) model. GFS-AVN and MRF products are a collection from NCEP’s NOAAPort. Grids, domains, run frequencies, and output frequencies have changed over the years.
See this blog post for a note on the mean sea level pressure (PRMSL) paramter in the GFS data delivered by LuckGrib. A quick summary is that as of August 28, 2018, an improved mean sea level pressure parameter is being used. This new parameter has a higher resolution and is able to resolve smaller features, such as tropical cyclones.