WU is really terrible about differentiating between speed and gusts IMO. I also send data to PWSWeather because their wind recording is much better, also IMO. You can see it here:
http://www.pwsweather.com/obs/TENMILE2.html
http://www.wunderground.com/weatherstation/WXDailyHistory.asp?ID=KTNTENMI3
http://www.pwsweather.com/obs/TENMILE2.html
http://www.wunderground.com/weatherstation/WXDailyHistory.asp?ID=KTNTENMI3