Radians are converted to degrees by multiplying by DperR (180 / π = 57.29578)
Dirgeo is the direction with respect to true north, (0=north,90=east,180=south,270=west) that the wind is coming from.
Dirgeo = atan2(-Ugeo,-Vgeo) * DperR = 270 - (atan2(Vgeo,Ugeo) * DperR)