_G<output-grid-number - 1> to it.  (For example, if 
    there are three output grids, the logical names for the
    GRID_CRO_2D-files would be GRID_CRO_2D_G0,
    GRID_CRO_2D_G1, and GRID_CRO_2D_G2.
    (It is a historical accident, perhaps caused by the fact that the
    developers of the EDSS model management framework were C programmers
    rather than Fortran programmers, that this enumeration starts with 
    zero instead of one.)  
    The file list is:
 -90 <= LAT <= 90 
                  -180 <= LON <= 180 
                  (Psurface - Ptop) 
                 
 -90 <= LAT <= 90 
                  -180 <= LON <= 180 
                  (Psurface - Ptop) 
                 INHYD = 1
            
SIG_H half level
                      surfaces for the EPA
                     CMAQ air quality model
                  SIG_F full level
                      surfaces for the EPA
                     CMAQ air quality model
             
 -90 <= LAT <= 90 
                  -180 <= LON <= 180 
                 
Note: Only available on proper windows into the MM5 domains
IMPHYS(NEST) >&nbpsp;1
                 IMPHYS(NEST) >&nbpsp;2
                 IMPHYS(NEST) >&nbpsp;2
                 IMPHYS(NEST) >&nbpsp;4
                 IMPHYS(NEST) >&nbpsp;4
                 IMPHYS(NEST) >&nbpsp;5
                 IMPHYS(NEST) >&nbpsp;5
                 (du/dx + dv/dy)dv/dx - du/dydv/dx - du/dy
- MM5V3,
ISOIL=2:
ALBis current time-dependent albedo fraction
ALBEDOis background time-independent albedo fraction- MM5V3,
ISOIL=3:
ALBEDOis current time-dependent albedo fraction
ALBis background time-independent albedo fraction- Otherwise (MM5V2 or
ISOIL=1)
ALBis background time-independent albedo fraction
IBLTYP = 7
                 IBLTYP = 7
                 IBLTYP = 7
                 IBLTYP = 7
                 IBLTYP = 7
                 IBLTYP = 7
                 IBLTYP = 7
                 IBLTYP = 7
                 IBLTYP = 7
                 IBLTYP = 7
                 ISOIL > 1
                 ISOIL = 1,3
                 010, 040, 100,
                       and 200 (cm)ISOIL = 2
                 ISOIL > 1
                 ISOIL = 2
                 ISOIL = 2
                 ISOIL = 2
                 ISOIL = 2
                 ISOIL = 3
                 ISOIL = 3
                 ISOIL = 3
                 ISOIL = 3
                 ISOIL = 3
                 ISOIL = 3
                 ISOIL = 3
                 ISOIL = 3
             
IMPHYS(NEST) >&nbpsp;1
                 IMPHYS(NEST) >&nbpsp;2
                 IMPHYS(NEST) >&nbpsp;2
                 IMPHYS(NEST) >&nbpsp;4
                 IMPHYS(NEST) >&nbpsp;4
                 IMPHYS(NEST) >&nbpsp;5
                 IMPHYS(NEST) >&nbpsp;5
                 (du/dx + dv/dy)dv/dx - du/dydv/dx - du/dyIMPHYS(NEST) >&nbpsp;1
                 IMPHYS(NEST) >&nbpsp;2
                 IMPHYS(NEST) >&nbpsp;2
                 IMPHYS(NEST) >&nbpsp;4
                 IMPHYS(NEST) >&nbpsp;4
                 IMPHYS(NEST) >&nbpsp;5
                 IMPHYS(NEST) >&nbpsp;5
                 IFRAD =&nbpsp;3
             
NOTE: Given 3-D sigma-H vertical-gridded variable FOO in standard I/O API order, interpolation to FOOP at pressure level L at column and row C,R is performed as follows, where COEF is one of CLIN (for linear-in-pressure interpolation), CLOG (for log(pressure) interpolation), or CPOW (for pressureR/CP interpolation):
        K  = PDEX( C,R,L )
        PP = COEF( C,R,L )
        QQ = 1.0 - PP
        FOOP( C,R,L ) = PP*FOO( C,R,K ) + QQ*( C,R,K+1 )
                       
                  IMPHYS(NEST) > 1
                  IMPHYS(NEST) > 2
                  IMPHYS(NEST) > 2
                  IMPHYS(NEST) > 4
                  IMPHYS(NEST) > 4
                   IMPHYS(NEST) > 4
                   IMPHYS(NEST) > 4
                (du/dx + dv/dy)dv/dx - du/dy
NOTE: Given 3-D sigma-H vertical-gridded variable FOO in standard I/O API order, interpolation to pressure level L at column and row C,R is performed as follows, where COEF is one of CLIN, CLOG, or CPOW):
        K  = PDEX( C,R,L )
        PP = COEF( C,R,L )
        QQ = 1.0 - PP
        FOOP( C,R,L ) = PP*FOO( C,R,K ) + QQ*( C,R,K+1 )