This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
> 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.