Daily Runs Backward Trajectories

Topics about the HYSPLIT trajectory model.
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sopan
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Joined: June 14th, 2016, 12:25 pm
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Daily Runs Backward Trajectories

Post by sopan » June 17th, 2016, 10:34 am

Dear Sir/Madam,
I have converted NARR 32KM data into Hysplit format. I am able to create input files for forward trajectory using Hysplit "Daily Runs" options.
I had tried to create the backward trajectories using Daily runs but it did not work (In the Daily Runs dialogue box I had set up the dates in reverse order, but it did not work). Could you please guide me about how to create backward Trajectories using Hysplit "Daily Runs" ?

Thank You,
Sopan

ariel.stein
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Joined: November 7th, 2012, 3:14 pm
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Re: Daily Runs Backward Trajectories

Post by ariel.stein » June 17th, 2016, 11:33 am

For your convenience the NARR meteorological dataset has already been converted to ARL and can be found at:
ftp://arlftp.arlhq.noaa.gov/narr/

Also, please follow the instructions from our workshop material and let us know if you have further questions:
http://www.ready.noaa.gov/documents/Tut ... _freq.html

Max Simus
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Joined: June 8th, 2020, 7:41 pm
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Re: Daily Runs Backward Trajectories

Post by Max Simus » June 16th, 2020, 3:55 pm

Good afternoon,
Have you solved and found your response? I mean, I am a bit confused about daily trajectories, whether it can be used as backward or forward.
I have tried to create the backward trajectories using Daily runs, but there was the same problem. Advise me, please. Thanks, Max

ariel.stein
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Joined: November 7th, 2012, 3:14 pm
Registered HYSPLIT User: Yes
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Re: Daily Runs Backward Trajectories

Post by ariel.stein » June 19th, 2020, 2:30 pm

Please follow the instructions described in the link from my response above. The only change you have to make is instead of running 48 hours forward you run for 48 hours backward. Each individual trajectory will represent a 48 hour back trajectory from the source that you enter in though the GUI.

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