[gradsusr] GFS total cloud cover

[AMS EmsiWx Bytča]

I may be wrong, but isn't it something what Ivan (Meteoadriatic) had 
asked not so long before?

NOAA's  "new" hourly input in general, "makes no sense".... So far as I 
know, values are accumulated/averaged, in every 6th step.

Hourly output should be "corrected" to get the right value....

Regarding GFS, I stick to get total cloud for every 6th hour, or I 
calculate the 6 hour average..... Not using hourly values.


Marian - EmsiWx.


Dňa 2. 11. 2016 o 22:08 Jeff Duda napísal(a):
> 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 
> <mailto: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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