I think the readGDAL() function from the rgdal package (http://cran.r-project.org/web/packages/rgdal/rgdal.pdf) can do the trick, since grib2 is a GDAL-supported format.
If not you can also use a dedicated free software to open data before importing it to R: http://sourceforge.net/projects/gribcs/.
I think the readGDAL() function from the rgdal package (http://cran.r-project.org/web/packages/rgdal/rgdal.pdf) can do the trick, since grib2 is a GDAL-supported format.
If not you can also use a dedicated free software to open data before importing it to R: http://sourceforge.net/projects/gribcs/.