For example, analyses from the ON84-format data from NCEP for 3 January 1998 at 12 UTC might be written to a file called "ON84:1998-01-03_12"
Record 1:  IFV
Record 2:  HDATE,
XFCST,
FIELD,
UNITS,
DESC,
XLVL,
NX,
NY,
IPROJ
  if (IPROJ ==
0) (Cylindrical equidistant projection)
        Record 3:  STARTLAT,
STARTLON,
DELTALAT,
DELTALON
  else if (IPROJ
== 1) (Mercator projection)
        Record 3:  STARTLAT,STARTLON,
DX,
DY,
TRUELAT1
  else if (IPROJ
== 3) (Lambert conformal projection)
        Record 3:  STARTLAT,
STARTLON,
DX,
DY,
XLONC,
TRUELAT1,
TRUELAT2
  else if (IPROJ
== 5) (Polar-stereographic projection)
        Record 3:  STARTLAT,
STARTLON,
DX,
DY,
XLONC,
TRUELAT1
  endif
Record 4:  SLAB
Where:
 
| IFV | integer | The REGRID intermediate-format version number, currently 3. | 
| HDATE | character (LEN=24) | The time, in format "YYYY-MM-DD_HH:mm:ss " (only the first 19 characters are used) | 
| XFCST | real | Forecast time (in hours) of the data in the slab | 
| FIELD | character (LEN=9) | A field name. Names with special meaning are described below. | 
| UNITS | character (LEN=25) | Units describing the field in the slab. | 
| DESC | character (LEN=46) | Text description of the field in the slab. | 
| XLVL | real | Pressure-level (Pa) of the data. 200100 Pa indicates surface data; 201300 Pa indicates sea-level pressure | 
| NX | integer | Slab dimension in the X direction | 
| NY | integer | Slab dimension in the Y direction | 
| IPROJ | integer | Flag denoting the projection.  Recognized values are: 0: Cylindrical Equidistant (Lat/lon) projection. 1: Mercator projection. 3: Lambert-conformal projection. 5: Polar-stereographic projection. | 
| STARTLAT | real | Starting latitude (degrees north) | 
| STARTLON | real | Starting longitude (degrees east) | 
| DELTALAT | real | Latitude increment (degrees) for lat/lon grid | 
| DELTALON | real | Longitude increment (degrees) for lat/lon grid | 
| DX | real | Grid-spacing in x (km at TRUELAT1 (and TRUELAT2 as appropriate)) | 
| DY | real | Grid-spacing in y (km at TRUELAT1 (and TRUELAT2 as appropriate)) | 
| XLONC | real | Center longitude of the projection | 
| TRUELAT1 | real | Extra latitude (degrees north) used for defining Mercator, Polar Stereographic, and Lambert conformal projections | 
| TRUELAT2 | real | A second extra latitude (degrees north) used for defining Lambert conformal projection | 
| SLAB | real, dimension(NX,NY) | Two-dimensional array of data. | 
| T | * Air temperature (K) | 
| U | * Grid-relative u-component of the horizontal wind (m s-1) | 
| V | * Grid-relative v-component of the horizontal wind (m s-1) | 
| RH | * Relative humidity (%, i.e., values generally range from 0 to 100) | 
| HGT | * Geopotential height (m) | 
| PMSL | * Sea-level pressure (Pa) | 
| SST | * Sea-surface Temperature (K). Either SST or SKINTEMP is required. Skin Temperature and sea-surface temperature are interpreted differently by the INTERPF program. | 
| SKINTEMP | * Skin Temperature (K). Either SST or SKINTEMP is required. Skin Temperature and sea-surface temperature are interpreted differently by the INTERPF program. | 
| SOILT010 | Ground temperature from 0 to 10 cm (K) | 
| SOILT200 | Ground temperature from 10 to 200 cm (K) | 
| SOILT400 | Ground temperature from 200 to 400 cm (K) | 
| SOILM010 | Soil moisture from 0 to 10 cm (K) | 
| SOILM200 | Soil moisture from 10 to 200 cm (K) | 
| SEAICE | Binary flag for the presence (1.0)/absence (0.0) of sea ice. The value should be 0.0 or 1.0. The grib.misc pregrid code makes a check on SEAICE. If a value > 0.5, SEAICE is set to 1.0, otherwise, SEAICE is set to 0.0. | 
| LANDSEA | Binary flag for land(1.0)/water(0.0) masking | 
| SOILHGT | Terrain elevation (m) of the input data set (not of the MM5 model terrain) | 
| WEASD | Water equivalent of accumulated snow depth (kg m-2 [equivalent ot mm]) | 
| SNOWCOVR | Binary flag for the presence (1.0) or absence (0.0) of snow on the ground | 
Last modified: Thu Sep 28 10:15:23 MDT 2000