[gradsusr] GFS hourly clouds output

[Ivan Toman]

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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