5. Product

The GraphCastGFS model runs 4 times a day at 00Z, 06Z, 12Z, and 18Z cycles. The horizontal resolution is on 0.25 degree lat-lon grid. The vertical resolutions are on both 13 and 37 pressure levels.

• The 13 pressure levels include:

  50, 100, 150, 200, 250, 300, 400, 500, 600, 700, 850, 925, and 1000 hPa.

• The 37 pressure levels include:

  1, 2, 3, 5, 7, 10, 20, 30, 50, 70, 100, 125, 150, 175, 200, 225, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 825, 850, 875, 900, 925, 950, 975, and 1000 hPa.

The model output fields are:

• 3D fields on pressure levels:

  • temperature

  • U and V component of wind

  • geopotential height

  • specific humidity

  • vertical velocity

• 2D surface fields:

  • 10-m U and V components of wind

  • 2-m temperature

  • mean sea-level pressure

  • 6-hourly total precipitation

The near real-time forecast outputs along with inputs are available on AWS.

For each cycle, the dataset contains input files to feed into GraphCast found in the directory:

graphcastgfs.yyyymmdd/hh/input

and 10-day forecast results for the current cycle found in the following directories:

graphcastgfs.yyyymmdd/hh/forecasts_13_levels

graphcastgfs.yyyymmdd/hh/forecasts_37_levels