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[IDV #IYV-263529]: Total sum over time steps



> Hi again,
> I figured out a way. I plotted the 3 time steps as a subset of time.
> Then I exported the data as a netcdf file.
> Then, I chose that nc file as a data source, and used the formula "total
> over all steps".
> presto!
> 
> alan
> 

As our conversation over the phone, I believe my suggest is simpler and easier. 
Give it a try.


Yuan
> On Thu, Jan 11, 2018 at 12:15 PM, Alan Bol <address@hidden> wrote:
> 
> > Hi Yuan,
> > What I'm looking for is the ability to sum the precipitation over a
> > discrete set of time steps within a much longer set of timesteps.
> > In this case that means taking the 12z 22-Aug-2017 GFS model run and
> > summing the precipitation from 18z 26-aug to 12z 27-aug (and a couple other
> > similar time intervals).
> >
> > The back-story is that we're looking at the National Water Model for
> > Hurricane Harvey in Houston, TX. We're comparing the mid-term forecast
> > (forced by the GFS) with the short-term forecast (forced by the HRRR). I
> > can get the total precip for a HRRR model run easily enough (accumulated
> > precip is actually a field in the data file). I'd like to match that with
> > accumulated precip in the GFS for the same valid time period, which lies in
> > the middle of the GFS model run.
> >
> > Any ideas?
> > thanks!
> > alan
> >
> >
> >
> > address@hidden> wrote:
> >
> >> > Hi,
> >> > I'm trying to plot accumulated rainfall for a 24-hour period midway
> >> through
> >> > a GFS model run. I've tried the formula "Total sum over time steps", but
> >> > when I select a subset of the times, it gives me the accumulated precip
> >> > over the last few time steps of the model run, not the times of
> >> interest.
> >> > Is there a way to do this?
> >> > thanks,
> >> > alan
> >> >
> >> > .xidv attached
> >> >
> >> > --
> >> > Alan Bol
> >> > Project Lead | Scientist | Instructional Design
> >> > 303.497.8334 voice
> >> > 303.497.8491 fax
> >> >
> >> >
> >> HI Alan,
> >>
> >> The "Total sum over time steps" does exactly what you were seeing. The
> >> result field has
> >> no time associated with it. If you want the result to associate with the
> >> last time
> >> step, please try another formula: sumFromBaseTime(field), this one is not
> >> in the list,
> >> but you can type in from:
> >> Formula > Grids > Define a grid diagnostic.
> >>
> >> let me know if this is not what you want.
> >>
> >> Yuan
> >>
> >> Ticket Details
> >> ===================
> >> Ticket ID: IYV-263529
> >> Department: Support IDV
> >> Priority: Normal
> >> Status: Closed
> >> ===================
> >> NOTE: All email exchanges with Unidata User Support are recorded in the
> >> Unidata inquiry tracking system and then made publicly available through
> >> the web.  If you do not want to have your interactions made available in
> >> this way, you must let us know in each email you send to us.
> >>
> >>
> >>
> >
> >
> > --
> > Alan Bol
> > Project Lead | Scientist | Instructional Design
> > 303.497.8334 <(303)%20497-8334> voice
> > 303.497.8491 <(303)%20497-8491> fax
> >
> 
> 
> 
> --
> Alan Bol
> Project Lead | Scientist | Instructional Design
> 303.497.8334 voice
> 303.497.8491 fax
> 
> 


Ticket Details
===================
Ticket ID: IYV-263529
Department: Support IDV
Priority: Normal
Status: Closed
===================
NOTE: All email exchanges with Unidata User Support are recorded in the Unidata 
inquiry tracking system and then made publicly available through the web.  If 
you do not want to have your interactions made available in this way, you must 
let us know in each email you send to us.