g2subset (grib2 subset) allows you to subset (time, field, level, or region) a GRIB2 file and
sends you the result
Subdirectory
|    nam.20210908 |
|    nam.20210907 |
|    nam.20210906 |
|    nam.20210905 |
|    nam.20210904 |
|    nam.20210903 |
|    nam.20210902 |
|    nam.20210901 |
g2sub 1.1.0.beta-6 and comments: Wesley.Ebisuzaki@noaa.gov, Jun.Wang@noaa.gov