HYSPLIT Forum: hysplitbbs.arl.noaa.gov

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?

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]