SGP/EBBR/E26 - Wind Direction Sensor Malfunction

The wind direction sensor malfunctioned, outputting nearly a 
constant value, invalidating the following data values.

30 minute: wind_d, sigma_wd, res_ws

15 minute: mv_wind_d

5 minute: wind_d, sigma_wd, res_ws

The first good data after the affected period was the 1700 GMT, 30 minute
data on March 16, 1994.

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

• Wind direction vector mean (mV)(wdir_vec_mean_mv)

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