[gradsusr] GFS total cloud cover

Jeff Duda jeffduda319 at gmail.com
Wed Nov 2 17:08:25 EDT 2016

It seems a little strange to me that the total cloud cover product would be
averaged over time. Is that really the case?

Anyway, if you really do have an average over overlapping and increasing
windows, with nothing else to go on and without applying the equations of
motion in reverse, you'd have to assume a linear averaging, so subtraction
of subsequent slices of the field (i.e., tcdcclm - tcdcclm(t-1)) would give
you piecewise temporal averages. However, that method would give you
negative cloud cover values which is clearly nonsensical, which again is
why I question whether or not that array contains a temporal average. That
just doesn't make a lot of sense.

Jeff Duda

On Wed, Nov 2, 2016 at 3:27 PM, Sam Wilson <sam at surfline.com> wrote:

> Hi,
> I’m working with hourly GFS total cloud cover (TCDCclm) and I’m a bit
> stumped on the following..
> Given TCDCclm for hours 0-1, 0-2, 0-3, 0-4, 0-5, and 0-6, what is the
> proper way to determine TCDCclm for hours 1-2, 2-3, 3-4, 4-5, and 5-6?
> I may be making the problem more difficult than it is..but wanted to ping
> this group to be sure.
> Is there an existing grads script that handles this already and if not,
> does anyone here have any insight?
> Thanks so much for your time.
> Best,
> Sam
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Jeff Duda
Post-doctoral research associate
University of Oklahoma School of Meteorology
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