Search found 429 matches

by sonny.zinn
June 26th, 2026, 6:26 am
Forum: Users
Topic: SEED not affecting particle positions in dispersion mode
Replies: 1
Views: 137

Re: SEED not affecting particle positions in dispersion mode

If you are using HYSPLIT 5.4.2 or an earlier version, set the SEED value in SETUP.CFG to a negative number to reach your goal.
by sonny.zinn
March 3rd, 2026, 7:03 am
Forum: Dispersion Model
Topic: Large ram usage for dispersion backward models
Replies: 1
Views: 55225

Re: Large ram usage for dispersion backward models

A similar increase in memory was observed when using HYSPLIT with HRRR. We have developed a fix that will be included in the next release.
by sonny.zinn
December 3rd, 2025, 2:11 pm
Forum: HYSPLIT for LINUX
Topic: version v5.2.1
Replies: 2
Views: 35465

Re: version v5.2.1

Are you looking for the public version 5.2.1 or the registered version?
by sonny.zinn
November 25th, 2025, 6:38 am
Forum: Dispersion Model
Topic: HAZMAT Materials for Dispersion
Replies: 2
Views: 56641

Re: HAZMAT Materials for Dispersion

Online HYSPLIT for registered users (at https://www.ready.noaa.gov/HYSPLIT_disp.php) supports the modeling of chemical dispersion and produces plume concentrations in parts per million (ppm). Both the NAM CONUS Nest (CNEST) and HRRR provide meteorological data at 3 km resolution. HRRR is updated ...
by sonny.zinn
September 29th, 2025, 8:29 am
Forum: HYSPLIT for PCs
Topic: HYSPLIT PC Installer Corrupt
Replies: 2
Views: 135314

Re: HYSPLIT PC Installer Corrupt

Thank you for your post. It appears your Windows PC is preventing an unsigned executable from running due to an elevated security measure. We are actively working on digitally signing executables and installers for our HYSPLIT distributions. In the meantime, please continue using the zipped ...
by sonny.zinn
September 16th, 2025, 8:17 am
Forum: Developers
Topic: source code
Replies: 1
Views: 106782

Re: source code

In order to request the HYSPLIT source code, you must first register with HYSPLIT. If you are not registered with HYSPLIT, please visit https://www.ready.noaa.gov/HYSPLIT_register.php and follow the instructions found there.

Once you are registered with HYSPLIT, contact arl.webmaster@noaa.gov and ...
by sonny.zinn
September 12th, 2025, 6:58 am
Forum: General Comments
Topic: HYSPLIT download not digitially signed
Replies: 1
Views: 109941

Re: HYSPLIT download not digitially signed

We could look into digitally signing the HYSPLIT package but it may take time to do so.
by sonny.zinn
August 8th, 2025, 5:40 am
Forum: HYSPLIT for PCs
Topic: Can you make the starting point star smaller or not appear?
Replies: 2
Views: 27413

Re: Can you make the starting point star smaller or not appear?

The star will not be shown if the -s0 option is used with the TRAJPLOT program.
by sonny.zinn
August 5th, 2025, 6:20 am
Forum: General questions on meteorological data needed for HYSPLIT
Topic: Using windrose command
Replies: 1
Views: 32340

Re: Using windrose command

Please see https://www.ready.noaa.gov/hysplitusers ... m#windrose for the command-line options for the WINDROSE program. WINDROSE takes a meteorological data file using two arguments, namely, -d and -f for directory and filename, respectively.
by sonny.zinn
July 17th, 2025, 8:02 am
Forum: HYSPLIT for PCs
Topic: HYSPLIT Not opening or running Download Error - Program Corrupt
Replies: 1
Views: 29406

Re: HYSPLIT Not opening or running Download Error - Program Corrupt

We updated the HYSPLIT download pages with information on how to verify the integrity of your download. If the SHA1 checksum of your download does not match the expected checksum, you might want to work with your IT department or your Internet service provider to resolve the download issue.

The ...

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