NSA/TWR/C1 - 40m wind data missing

There was a communication problem with the 40m wind sensor. Data are missing during the 
indicated time period.

• 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)