@endison8
The epw file you shared has all wind directions from 0-255, which makes me think this is not converted correctly from wea.
if you have originally recorded data, you can just import wind speed and wind direction directly to Grasshopper, and then use LB to visualize it.
Or you can use standard epw data from Taoyuan or Taipei.
http://climate.onebuilding.org/WMO_Region_2_Asia/TWN_Taiwan/index.html
Hope this helps,
Mingbo