Hysplit Tragectory in Windows - issue with starting day

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Anne70
Posts: 2
Joined: January 28th, 2015, 2:45 pm
Registered HYSPLIT User: No

Hysplit Tragectory in Windows - issue with starting day

Post by Anne70 » September 18th, 2016, 11:58 am

Hello, I am a home user of Hysplit, and I am running it on a PC laptop, Windows 32 bits (Vista).

In relation to the Gordon Bennett Gas Balloon competition, I would like to run Hysplit Trajectory. I know I can do it online, but I was only able to run the online model a few times, then I was unable to connect to the server again. Well I guess it's busy :-)

Ok so I downloaded everything on my laptop and so far so good. I was able to get the meteorological model, etc.

First issue: I was unable to enter a later time than the meteorological model to start the calculation. I am using the gfslrf (2.5 degrees) and downloaded the latest available which is the 06 UTC (I thought I could get the 12 UTC, but it seems it was not available yet). Even if I enter time 22 UTC (same day, that is today) to start the model calculation, it does not work. I got error message that my starting time is -prior- to starting time of the meteorological model, which is not the case.

After reading the User Guide, I saw that if I leave all to '00' in the time and date field, the trajectory calculation would start at the same time as the meteorological model is starting. So I did that and I got a first result which seemed to make sense (it displayed in GSview properly).

I wanted to re-run the trajectory model with a longer time window, and here problems started: the starting day of the trajectory calculation is BLOCKED on the 28th of September! I tried everything (starting again, deleting the parameter files and starting from scratch, downloading again the meteorological model), nothing helped. I can't get the start date changed to anything else than 28th of September.

I am stuck now, so I hope that somebody can help me with this issue :-)

Have a nice evening everybody,
Cheers
Anne
Stavanger. Norway

barbara.stunder
Posts: 365
Joined: November 9th, 2012, 4:23 pm
Registered HYSPLIT User: Yes

Re: Hysplit Tragectory in Windows - issue with starting day

Post by barbara.stunder » September 19th, 2016, 8:08 am

Please see http://ready.arl.noaa.gov/READYmetdata.php. You should use both the gfsf (forecast hours +0 to +240) and gfslrf (forecast hours +240 to +384).

Anne70
Posts: 2
Joined: January 28th, 2015, 2:45 pm
Registered HYSPLIT User: No

Re: Hysplit Tragectory in Windows - issue with starting day

Post by Anne70 » September 19th, 2016, 4:00 pm

Hello Barbara and thank you for your help. Indeed, by downloading the 1 degree GFSF model, I was able to run my trajectory from the present time.

I hadn't realized that GFSFlr was for 'long range'. I thought the GFSF models were only different is spatial resolution (0.5, 1 and 2.5 degrees). But of course it makes sense when one wants to calculate a pollutant trajectory to have another model from 10+ days and ahead. Very interesting.

I just recalculated a trajectory for the Gordon Bennett Cup balloons, and found that they might head to Greece... Let's see how this works out :)

Have a nice day,
Cheers
Anne

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