Intermediate File Format: SI

Record 1:  IFV
Record 2:  HDATE, XFCST, MAP_SOURCE, FIELD, UNITS, DESC, XLVL, NX, NY, IPROJ
  if (IPROJ == 0) (Cylindrical equidistant projection)
        Record 3:  STARTLOC, STARTLAT, STARTLON, DELTALAT, DELTALON
  else if (IPROJ == 1) (Mercator projection)
        Record 3:  STARTLOC, STARTLAT,STARTLON, DX, DY, TRUELAT1
  else if (IPROJ == 3) (Lambert conformal projection)
        Record 3:  STARTLOC, STARTLAT, STARTLON, DX, DY, XLONC, TRUELAT1, TRUELAT2
  else if (IPROJ == 5) (Polar-stereographic projection)
        Record 3:  STARTLOC, STARTLAT, STARTLON, DX, DY, XLONC, TRUELAT1
  endif
Record 4:  SLAB

Where:

IFV	integer	intermediate-format version number for WRFSI is 4
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
MAP_SOURCE	character (LEN=32)	Source of data
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.
STARTLOC	character (LEN=8)	Start location of data. Could be "CENTER" or "SWCORNER". "SWCORNER" is typical.
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.