Search found 406 matches

by barbara.stunder
July 6th, 2020, 10:37 am
Forum: Cluster Analysis
Topic: Reference for HYSPLIT clustering algorithm
Replies: 2
Views: 9

Re: Reference for HYSPLIT clustering algorithm

Stunder, B.J.B, 1996: An Assessment of the Quality of Forecast Trajectories, J. Appl. Meteor. 35 (8): 1319–1331.
by barbara.stunder
July 6th, 2020, 10:12 am
Forum: Users
Topic: NOAA ARL GFS soundinds data presentation
Replies: 1
Views: 20

Re: NOAA ARL GFS soundinds data presentation

Thank you for these suggestions, we will consider them.
by barbara.stunder
July 6th, 2020, 10:09 am
Forum: Dispersion Model
Topic: Measuring radionuclide dispersal
Replies: 1
Views: 15

Re: Measuring radionuclide dispersal

The online version does not have this capability. Since you are a new HYSPLIT user, you should go through the Tutorial at https://www.ready.noaa.gov/HYSPLIT_Tutorials.php. See Section 15.1 for details.
by barbara.stunder
July 6th, 2020, 8:44 am
Forum: Trajectory Model
Topic: Backward trajectory error
Replies: 1
Views: 13

Re: Backward trajectory error

The gdas0p5 would give some of the error - due to horizonal resolution, however we don't know the error in the gdas0p5. You need to know the real (observed) winds in order to know the error. You could compare model winds to some soundings over a long period of time and then estimate how that error c...
by barbara.stunder
July 2nd, 2020, 8:51 am
Forum: Users
Topic: What should i do to use advanced tab in DOS
Replies: 1
Views: 14

Re: What should i do to use advanced tab in DOS

Please see the User's Guide at https://ready.arl.noaa.gov/hysplitusersguide/, and click on "ADVANCED".
by barbara.stunder
June 29th, 2020, 10:06 am
Forum: 6. Trajectory statistics
Topic: Query regarding back trajectory
Replies: 1
Views: 32

Re: Query regarding back trajectory

(1) In the Tutorial/workshop the forward trajectory was set to 68-hours because that is the time period corresponding to the tracer measurements at the ground. Then to show the trajectory computational error, a 68-h back trajectory was run from the endpoint of the forward trajectory, so see how clos...
by barbara.stunder
June 25th, 2020, 4:25 pm
Forum: 17. Custom simulations
Topic: run with several periods at a time
Replies: 1
Views: 36

Re: run with several periods at a time

Yes, but not all of this in the GUI. The Concentration, Special Runs, Daily can run for a long period. Batch files/scripting could be useful for your application. Then you need to do the averaging. There is a program con2asc.exe that converts the concentration to ASCII text that could be used elsewh...
by barbara.stunder
June 25th, 2020, 2:09 pm
Forum: 3. Gridded meteorological data files
Topic: How to run back-trajectories on a long period without having simultaneously all the meteorological files on my PC?
Replies: 1
Views: 26

Re: How to run back-trajectories on a long period without having simultaneously all the meteorological files on my PC?

Unfortunately, you need to download the meteorology. Scripts can be sometimes hard to setup but then you should save a lot of time for the runs. Start small and keep adding to it until you end up with what you want. You may be able to essentially piece together batch files from the tutorial Sec. 3.2...
by barbara.stunder
June 25th, 2020, 9:58 am
Forum: 14. Wildfire smoke and dust storms
Topic: sand storm
Replies: 1
Views: 10

Re: sand storm

Sorry for the late response. Yes. I wonder if you forced the time step to 30 minutes (Advanced - Configuration Setup - Concentration - #1 Time Steps).
If you left it to automatically compute the time step, due to the high winds aloft, it will go to 1 minute time steps, and so run MUCH more slowly.
by barbara.stunder
June 24th, 2020, 2:10 pm
Forum: Conversion programs
Topic: Convert to DATEM
Replies: 4
Views: 70

Re: Convert to DATEM

I'm not sure it can't find c2datem.exe. It is saying i/o error on unit 20, file hysplit2.bin. A simple test of the 'cdump' file, here hysplit2.bin is - through the GUI, Concentration, Utilities, Simple Listing. Navigate to that file. and 'show file contents. It should list header info near the top, ...