NCEP GDAS/FNL 0.25 Degree Global Tropospheric Analyses and Forecast Grids
| DOI: 10.5065/D65Q4T4Z
These NCEP FNL (Final) operational global analysis and forecast data are on 0.25-degree by 0.25-degree grids prepared operationally every six hours. This product is from the Global Data Assimilation System (GDAS), which continuously collects observational data from the Global Telecommunications System (GTS), and other sources, for many analyses. The FNLs are made with the same model which NCEP uses in the Global Forecast System (GFS), but the FNLs are prepared about an hour or so after the GFS is initialized. The FNLs are delayed so that more observational data can be used. The GFS is run earlier in support of time critical forecast needs, and uses the FNL from the previous 6 hour cycle as part of its initialization.
The analyses are available on the surface, at 26 mandatory (and other pressure) levels from 1000 millibars to 10 millibars, in the surface boundary layer and at some sigma layers, the tropopause and a few others. Parameters include surface pressure, sea level pressure, geopotential height, temperature, sea surface temperature, soil values, ice cover, relative humidity, u- and v- winds, vertical motion, vorticity and ozone.
The archive time series is continuously extended to a near-current date. It is not maintained in real-time.
|Air Temperature||Albedo||Cloud Frequency||Cloud Liquid Water/Ice|
|Dew Point Temperature||Evaporation||Geopotential Height||Gravity Wave|
|Heat Flux||Humidity||Hydrostatic Pressure||Ice Extent|
|Land Use/Land Cover Classification||Longwave Radiation||Maximum/Minimum Temperature||Planetary Boundary Layer Height|
|Potential Temperature||Precipitation Amount||Precipitation Rate||Runoff|
|Sea Level Pressure||Sea Surface Temperature||Shortwave Radiation||Skin Temperature|
|Snow Depth||Snow Water Equivalent||Soil Moisture/Water Content||Soil Temperature|
|Surface Winds||Total Precipitable Water||Upper Air Temperature||Upper Level Winds|
|Vertical Wind Velocity/Speed||Vorticity||Wind Shear|
Latitude Range: Southernmost=90S Northernmost=90N Detailed coverage information
NCEP Global Parallel System Documentation
MRF/AVN/GDAS CHANGES SINCE 1991
THE NATIONAL WEATHER SERVICE GATEWAY ... HISTORY ...
NCAR Command Language GRIB to NetCDF file structure description
Ask NCEP science questions about the FNL dataset through this link
NCEP Grid-Point Statistical Interpolation (GSI) homepage
WRF User Support
NCEP GDAS 'real-time' operational data access