[gradsusr] How to create CDF and PDF of ensemble precipitation forecast from NWP Models

Jeff Duda jeffduda319 at gmail.com
Tue Jun 18 13:27:19 EDT 2019

Unfortunately, Grads is not well suited for plotting probabilistic
distributions from forecast data sets. While it is technically possible,
you would need to either
1) draw every single axis of the plot manually (i.e., using only "draw
rec(f)", "draw line" etc. after you have computed the pdf and cdf
properties (which you would also have to do manually), or
2) calculate the aspects of the distribution you would like to plot using
software outside of Grads, write it to a file format that Grads can
recognize, then use that data file to plot the distribution in Grads

I recommend neither. You would be better off using something such as
Python/matplotlib, NCL, MATLAB, or R to create what you are looking for.

Best of luck.

Jeff Duda

On Tue, Jun 18, 2019 at 8:39 AM bizuayeh Abera <bizuayehu.abera at amu.edu.et>

> How can i create cdf for ensemble precipitation forecast?
> ECMWF having 50 ensemble preturbed forecast and 1 control forecast, for
> this how can i create pdf and cdf.
> Bizuayehu Abera
> Best Regards
> _______________________________________________
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> gradsusr at gradsusr.org
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Jeff Duda, Research Scientist
University of Colorado Boulder
Cooperative Institute for Research in Environmental Sciences
NOAA/OAR/ESRL/Global Systems Division
Boulder, CO
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