SGP/MWR3C/C1 - Intermittent data

There are frequent data gaps between 3/9 and 3/18. The problem was due to a full hard 
drive.

• time
• wind_speed_avg
• wind_speed_min
• elevation
• time_offset
• tbsky23
• tbsky89
• rain_intensity
• infrared_temperature
• alt
• surface_pressure
• wind_speed_max
• lwp
• hail_duration
• azimuth
• rain_duration
• surface_temperature
• tbsky30
• base_time
• pwv
• rain_accumulation
• lon
• wind_direction_max
• pwverr
• lwperr
• hail_accumulation
• hail_intensity
• rain_peak_intensity
• lat
• surface_relative_humidity
• wind_direction_min
• wind_direction_avg