[gradsusr] g2ctl/gribmap and 6hr/12hr GFS

[Christopher Gilroy]

I've always been curious for those who run their plots using scripting
approaches and download in 3 or 6-hour increments, how do you handle past
hour 240?

For example, downloading 6hr files, starting at hr 0, t41=240 and then
t43=252 and I'm curious if there's a way to make t42=252, t43=264, etc. I'm
just looking for a way to make every t = a working timestep.

So as an example, if you made a looping grads script for all 384 hours,
using 6h files the only way I knew of to "get around" the 2 t-step
increments after 240 was doing something like:

i=1
while (i <= 65)

if (i <= 41)
trecord=i
endif
if (i=42)
trecord = 43
endif
if (i=43)
trecord = 45
endif

'd tmp2m'

The only reason I cared to do that even was because otherwise every other
image past hr240 would be blank since there is no t=42, t=44, etc.
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