[gradsusr] Ensemble mean & Anomaly

[Chorley Weather]

Hi jeff, 

I was using this grads server link
http://nomads.ncep.noaa.gov:9090/dods/gens/gens20160120/gep_all_00z but
ill download the grib files and try it that way. As for the 'Anomaly'
question I was actually on about GFS data. I would like to produce a
500mb height anomaly like the image attached but dint know how to define
this. 

regards, 

Stuart. 

On 20-01-2016 15:10, Jeff Duda wrote: 

> From my experience with GEFS data, each ensemble member is contained in a separate file. So I hope your control file uses templating and has an EDEF entry. If it doesn't, or you don't have all the data files, then that explains why your 'define ensmean=ave(t850,e=1,e=21)' command is just giving you the control member (because it's the only one present).
> 
> I assume by "anomaly" you mean the difference between a given ensemble member and the ensemble mean. In that case, just plot the difference field between an ensemble member and the ensemble mean. For instance,
> 
> 'set e 2' 'd tmpprs - ensmean'
> 
> Jeff Duda 
> 
> On Wed, Jan 20, 2016 at 8:05 AM, Chorley Weather <weatherstu at chorleyweather.com> wrote:
> 
>> Hi all, 
>> 
>> I have a couple of questions, firstly I am trying get the mean run in a spaghetti graph of the GEFS but I seem to keep getting the control run. Here is the script: 
>> 
>> 'set t 1 65'
>> 'set e 1'
>> 'set csmooth on'
>> 'set cmark 0'
>> 'set lat 53';'set lon -2.23'
>> 'set vrange -30 30'
>> 'define t850=tmpprs(lev=850)-273.16'
>> 'define ensmean=ave(t850,e=1,e=21)'
>> 'set gxout line'
>> 'set ccolor 2'
>> 'set cthick 8'
>> 'd ensmean' 
>> 
>> Second question, using the GFS how do I produce anomaly charts with this script, im not sure how to define it..... 
>> 
>> 'set t 'i
>> 'set grads off'
>> 'set csmooth on'
>> 'define geopotdam = hgtprs(lev=500)/10'
>> 'color -gxout shaded -30 30 1 -kind blue->white->red-> -xcbar 10.1 10.3 0.7 7.74 -fs 10' 
>> 
>> Regards, 
>> -- 
>> 
>> Stuart Markham 
>> 
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr [1]
> 
> -- 
> 
> Jeff Duda
> Graduate research assistant
> University of Oklahoma School of Meteorology
> Center for Analysis and Prediction of Storms 
> 
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-- 

Stuart Markham 

 

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