Wind speed along a trajectory

Topics about the HYSPLIT trajectory model.
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arl.noaa
Posts: 33
Joined: November 9th, 2012, 2:49 pm
Registered HYSPLIT User: No

Wind speed along a trajectory

Post by arl.noaa » November 13th, 2012, 10:11 am

Recently I am using HYSPLIT to do a backward trajectory analysis, but I didn't find any information about the wind speed along the trajectory, which I am very interested in.
Could you please help me get in contact with people who work with HYSPLIT backward trajectory, so I can ask more specific questions? Your help are highly appreciated!

glenn.rolph
Posts: 362
Joined: November 7th, 2012, 1:39 pm
Registered HYSPLIT User: Yes
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Re: Wind speed along a trajectory

Post by glenn.rolph » November 13th, 2012, 10:12 am

Wind speed is not one of the trajectory output options for meteorological variables in HYSPLIT. However it can be computed from the difference in the hourly end point positions.

DIST=SQRT[ (lat2-lat1)**2 + ((lon2-lon1)*cos(0.5*(lat2+lat1)))**2 ] * 111000

UBAR (m/s) = DIST/3600.0

A Google search will yield more accurate equations if needed.

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