[gradsusr] GFS total accumulated precipitation

[Brian Gaze]

Hi,

I'd like to be able to plot a chart using shading and contours for a lat
long range (rather than single point) which displays the total accumulated
precipitation for a series of time steps rather than each individual one in
the GFS run. For example, total precipitation for 0 to 384 hours, lat 30 to
60, lon -45 -60.

The GFS grib2 files don't seem to contain a variable with this data so I'm
guessing it's necessary to sum precipitation values from each individual
file? Any suggestions for the best way to go about this?

Thanks

BWG
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