[gradsusr] GFS hourly clouds output

[Mark Sponsler]

My guess is this variable is like some of the precip variables in that it accumulates over time. You have to subtract the value for  time increment 1 to get just the data for increment 2 (2 - 1) and maybe even for increment 3 (3  - 2 ).  It accumulates. That's what gives the graphics the 'pulsing' effect.

There's a thread somewhere in the archives about 'GFS precip' and how to calculate it. . 

On September 29, 2016 1:19:41 PM PDT, Ivan Toman <ivtoman at inet.hr> wrote:
>Hello,
>
>Thank you for comment;
>
>Yes of course it is single run.
>
>Just to explain briefly what I do, because there is no reply, I started
>
>to believe it is my mistake somewhere. But I do think I do everything
>OK 
>because all other things I postprocess are ok, including various ARW, 
>NMM, NMMB, "old" GFS, and so on.. and also all other fields from GFS is
>
>OK, exept cloud cover.
>
>So, I download series of grib2 GFS files from grib filter using time 
>advancing for loop in bash. After gribs are in place, I concatenate
>them 
>into single grib, by:
>cat *pgrb2f* > $GRIBDIR/gfs.grib2
>
>After that I run g2ctl and gribmap on that grib:
>g2ctl -verf gfs.grib2 > gfs.grib2.ctl
>gribmap -i gfs.grib2.ctl
>
>Finally, I plot fields using GrADS, for cloud cover using TCDChcll, 
>TCDCmcll, TCDClcll and TCDCccll variables, in time advancing loop
>inside 
>GrADS over t:
>
>while ( i <= last )
>'set t 'i
>...
>endwhile
>
>Do I miss something?
>
>Thanks again,
>Ivan Toman
>
>
>On 09/29/2016 08:25 PM, James T. Potemra wrote:
>> Hi Ivan,
>>
>> Are you getting these from a single forecast run?  If not, and you
>are
>> looking at an aggregation of different forecasts, you might be seeing
>an
>> impact from re-initialization of the model (I think the GFS is run at
>> 00, 06, 12 and 18 daily).
>>
>> Jim
>>
>>
>> On 9/27/16 10:26 AM, Ivan Toman wrote:
>>> Hello always helpful GrADS community;
>>>
>>> I have problem with displaying GFS 0.25deg hourly clouds. It seems
>to me
>>> that something is broken. It is hard to explain, but best
>explanation is
>>> this 24h animation: http://www.meteoadriatic.net/pub/clouds_01.gif
>>>
>>> So, it seems that clouds somehow "jump" at every 6th hour, and
>inbetween
>>> are less and less defined, something like averaged more and more
>every
>>> hour, until they "jump" little bit and become defined again well.
>And
>>> then again in loop that repeats it's behaviour every 6 hours...
>>>
>>> What is going on there?
>>>
>>> Many thanks,
>>>
>>> Ivan Toman
>>>
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Thanks,
Mark Sponsler
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