NSA/MET/C1 - Incorrect 20m wind data

The 20 meter wind data flatline due to a loss of communication settings.

Interpolate between 10 meter and 40 meter wind data in this datastream.

• Wind speed vector mean(wspd_vec_mean)
• Wind speed arithmetic mean(wspd_arith_mean)
• Wind direction vector mean standard deviation(wdir_vec_std)
• Wind direction vector mean(wdir_vec_mean)