Wind speed along trajectory

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Wind speed along trajectory

Postby arl.noaa » May 7th, 2013, 2:25 pm

I am using HYSPLIT to do a backward trajectory analysis, but I didn't find any information about the wind speed along the trajectory. Could you please tell me if this is possible?
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Re: Wind speed along trajectory

Postby glenn.rolph » May 7th, 2013, 2:27 pm

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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