Hey,
Did you know that you can access data from personal weather staions on wunderground.com? Check out this one in Suwanee, GA (It's just like iwindsurf.com).
http://www.wunderground.com/weatherstation/WXDailyHistory.asp?ID=KGASUWAN2
Bill
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Bill Herderich
In looking at a lot of these, they tend to measure wind in the lee of their garage. There is another station in Cumming IIRC
from 3-6 pm, the suwanee station measured 5-10 while Gilmer was showing 13-15 (not counting the gusts). Gilmer was about 13-15 all day (with probably higher gusts while suwanee showed 5-10 with a few 15s
gilmer: http://www.windsurfatlanta.org/cgi-bin/winddb/current.cgi
choose KGVL
btw, seeing the wind shadow and how far out the wind line at Van Pugh can be, makes me wonder about the wisdom of spending any money for a wind sensor there or most places on Lanier.