HYSPLIT Forum: hysplitbbs.arl.noaa.gov

Hi,

Is it possible to create an array of times over which trajectories will run?

Specifically, I want to create a summarized trajectory for days when the wind was blowing in one particular direction. These days are unevenly distributed in time.

Thanks,
Miriam

There are two options to create a set of trajectories with a non-regular series of start times:
(1) Run the "Daily" option for the months of interest, and then delete the trajectories you don't need. In the GUI, Trajectory / Special Runs / Daily
(2) Create a script to loop through your specific dates. Example scripts/templates are in c:\hysplit4\examples\scripts

Thanks for responding.

If I go route (1), do you mean I should delete the "tdump" files that I don't want? If that is the case, how can I display a trajectory after deleting the tdump files that I don't want?

I assumed you know in advance which trajectories you want. Clearly, if you want to display a trajectory you need to keep the tdump file.

I do know which tdump files I want. My question is how do I then visualize the trajectory (in Google Earth) using the specific group of tdump files that I want to use?

To visualize a set of trajectories in Google Earth, you can run trajplot from the Command Prompt in c:\working,
..\exec\trajplot -i+INFILE ... -a3

INFILE is a text file in c:\working with the list of the tdump filenames, one tdump file per line.

There is an example INFILE at http://ready.arl.noaa.gov/documents/Tut ... _clus.html
The -i+<filename> is also described in the HELP in the GUI in Trajectory / Display / Trajectory (s230.htm)

Hi, I am new to this model and I am having the same question.
I need to run trajectories from selected days among 1979-2016 DJF 6hr data. I am using the PC version of model.

Thank you Barbara for providing the two options. However, I still have two questions about these options and I could't find the answer in the forum.

-For option #1, can anyone please show me how to create a batch script for the model to run continuously from 1979-2016? Or at least for one year? I learned from the tutorial that I can change the setting in the script, but it was not shown in detail.

-For option #2, can somebody please show me the example scripts about templates or loop through specific dates? I have checked the model files on my PC but I couldn't find that example script.

Thank you very much!!

Yang

Both for #1 and #2 -

See the batch file that loops through days in a given month-year:
C:\hysplit4\examples\scripts\batch\Data_run.bat.

The "for %%D in" is the day loop. You would just need to add a month (and year) loop.
Opening the batch files that script calls, change the Data_convert.bat to Traj_run.bat,
and edit it for the starting year-month-day variables.

Thank you! Now I see how to change the loop! However, I am still a bit confused with your reply about:

barbara.stunder wrote: Opening the batch files that script calls, change the Data_convert.bat to Traj_run.bat,
and edit it for the starting year-month-day variables.

What is the file name of the "script" you mentioned? And why do I need to change the Data_convert.bat to Traj_run.bat?
Thank you so much for your time!

Best,
Yang

Data_run.bat runs Data_hour.bat, which runs Data_convert.bat, which runs narr2arl (converts NARR meteorology format). You want to run trajectories so to do that, you need Traj_run.bat, which runs the trajectory program hyts_std. Data_run.bat and Data_hour.bat have all the loops.