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Fort.22x.grb2 file

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ADCIRC version: = 55

The fort.22x.grb2 files are meteorological inputs in GRIB2 binary. These GRIB2 files are read by ADCIRC through the wgrib2api static library. The API automatically generates an inventory of the GRIB2 file at the beginning of simulation to determine variable and valid datetime information in the files. The user does not need to do anything other than provide the correct filenames with valid GRIB2 variable names, in addition to specifying the fort.15 file attributes correctly; NWS = 14, correct WTIMINC, and correct NCDATE.


Contains the surface pressure/sea level pressure data. Valid GRIB2 variable names for this file are:

  • :PRMSL:mean sea level: or
  • :MSLET:mean sea level: or
  • :PRES:surface:

The mean sea level pressure, MSLET, is known to be a better choice than its counterpart, PRMSL, in the GFS model [1]. In comparison, the CFSv2 model does not provide MSLET, thus PRMSL should be used. PRES:surface (surface pressure) should be equivalent to PRMSL/MSLET over the ocean and in general can be used. However, problems could arise at the land/ocean interface when there is a significant discrepancy between the ocean/land mask in ADCIRC and the meteorological model due to resolution differences.


Contains the wind velocity at 10-m height data. Valid GRIB2 variable names for this file are:

  • :UGRD:10 m above ground: and
  • :VGRD:10 m above ground:

fort.225.grb2 [optional]

Contains the surface ice concentration as an area fraction. Valid GRIB2 variable names for this file are:

  • :ICEC:surface:

GRIB2 utility

The WGRIB2 utility can be used to manipulate and generate GRIB2 files with ease through scripts such as bash and perl.