HYSPLIT Forum: hysplitbbs.arl.noaa.gov

Hello.

When I looked in the 'Initial CONTROL File Section,' I found that if a given file does not have a vertical wind speed variable, the vertical motion will be computed from the horizontal velocity divergence. Is there any way to locate the values of the vertical motion/wind speed if given a certain region? I don't mind getting my hands dirty in the code to run an executable.

Thank you.

You can use the "profile" program to extract the vertical wind (WWND) from the ARL formatted file for a location with given lat/long.
For running with command lines => [your HYSPLIT directory]/exec/profile.
For using GUI => https://www.ready.noaa.gov/hysplitusersguide/S132.htm

Hi Fantine,

I've attempted this, but my file (GDAS 0.5) does not have WWND variable. Instead, HYSPLIT computes this from the horizontal velocity divergence. I was curious how I could find the values of this calculation.

The subroutine for computing WWND from the divergence is [your HYSPLIT dir]/library/hysplit/metdiv.f.
You may consider using vmixing.f (which extract meteorological stability parameters) to add WWND in the extraction. It is [your HYSPLIT dir]/source/vmixing.f