Wind speed along 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 trajectory

Post by arl.noaa »

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

Post by glenn.rolph »

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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