GrADS and precip units

[Dan Leins]

List,
 I dumped the contents of an eta 48hr grib file using grib2ctl to a control
file so I could use GrADS to plot surface pressure and precip. However I
couldn't help but notice that the units for Surface Convective Precip were
in kg/m^2. Pardon my ignorance, as I've never actually plotted precip
contours before, but how does this convert into inches or even centimetes?
The values produced seemed suspiciously high, similar to something you might
see in a convective feedback situation, and I was wondering if there is some
sort of conversion factor I'm not aware of, or if I should literally expect
4" liquid equivalent in a 3 hr period?
 Thanks,
Dan
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