Feb 2018 version "daily" not using the correct hour

Post any defects you find in the HYSPLIT software here. The HYSPLIT Developers carefully monitor this list and will work diligently to repair any reported problems. When posting a bug report, please specify both the HYSPLIT version and operating system you are using.
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alyssaholler
Posts: 1
Joined: September 5th, 2018, 5:49 pm
Registered HYSPLIT User: No

Feb 2018 version "daily" not using the correct hour

Post by alyssaholler » November 6th, 2018, 5:24 pm

Hi all,

I'm using Hysplit to create clusters for yearly data. The Feb 2018 version of Hysplit allows you to input how many hours between trajectory calculations; I'm using 6. However, about on the 5th day of November, 2017, Hysplit changes from tdump files ending in 00, 06, 12, and 18, to 05, 11, 17, and 23. Does anyone know what could be causing this?

barbara.stunder
Posts: 272
Joined: November 9th, 2012, 4:23 pm
Registered HYSPLIT User: Yes

Re: Feb 2018 version "daily" not using the correct hour

Post by barbara.stunder » November 7th, 2018, 4:29 pm

It appears to be an issue related to Daylight Savings time. The next release will have the fix. If you want to edit your version, open the text file C:\hysplit4\guicode\auto_traj.tcl

See the three consecutive commands:
set base [...]
set temp [...]
set date [...]

Add " -gmt T" inside the square brackets at the end of each of those three commands.
For example:
set base [... -gmt T]

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