The builtin output formats for wgrib are

      binary: single precision CPU native format

      ieee:   single precision big-endian IEEE (32 bits)

      grib:

      text:

Someone had the need to produce double precision output.  One

may question their wisdom because probably all GRIB data have 

less precision than the single precision floating point

format.  Nevertheless it was easy to modify wgrib to output 

double precision floating point numbers as the standard binary

format. (Writing dp ieee is much more difficult.)

Kludge number 102:

Edit the file wgrib.c by changing all occurances of float

to double.  Change the line

    #include <double.h>

back to 

    #include <float.h>

Remember that you must change ALL occurances of "float" and 

that word may occur more than once on a line.

Compile normally and if all goes well, the "-bin" option

will now produce double precision floating output.  Don't

forget the default format is "-bin".

Note:  The kludge looks good but hasn't been examined with

a fine-tooth comb.  I should probably change "float" to

FLOAT and use a typedef.  However, this change is really

low priority.

END OF KLUDGE NUMBER 102