regarding wind speed calculations.
from NOAA, you get u and v components of speed in m/s
to get VR values from NOAA, you need to apply the following :
calculate speed in km/h : x=sqrt(u*u + v*v) * 3.6
round it at 1 km/h : y=int(x+0.5)
convert to Nds : z = y / 1.852
round to 0.1 Nds : int(10*z+0.5)/10
compared this with 30-40 various cells and it works
As far as I know, VR is calculating in km/h, then 'y' should be used for calculations and final for display purposes.
Hope Omar could implement in a future release
Thanks Omar for VRTool