SGP/THWAPS/C1 - Minor bias in saturation vapor pressure

The saturation vapor correction when temps are below 0C contained an error
in the multiplier.  The incorrect multiplier only equates to an error of
0.01 kPa which is less than the stated uncertainty of the measurement (+/-
0.035 kPa).

• Pressure, vapor, 60-m height, 30-min intervals(vap_pres)

SGP/THWAPS/C1 - RH Data Incorrect

The RH data was incorrect during the times listed.  Reason unknown.  The sensor recovered 
on its own.

• Pressure, vapor, 60-m height, 30-min intervals(vap_pres)
• Humidity, relative, 30-min intervals, standard deviation(sd_rh)
• sd_vap_pres
• Humidity, relative(rh)

SGP/THWAPS/C1 - Barometer intermittent

Intermittent dropouts on the barometer data were occurring, with data reading low or 
missing.  Loose wiring was the probable culprit.

In most instances, only 1 minute of data was missing. Linear interpolation between the 
last known good point and the first good point following the dropout can be accomplished.

• Pressure, atmospheric, constant value of model level, RUC model output(pres)

SGP/THWAPS/C1 - Time stamp of data record incorrect

Due to problems with the collector system, the datalogger was being time synched 
inappropriately.  This problem was intermittent and did not affect every time stamp.  The worst 
case time adjustments were approximately +/- 7 minutes.  These were infrequent and most of 
the time adjustments were less than 7 minutes.

• time_offset
• base_time

SGP/THWAPS/C1 - Wind speed incorrect

The wind sensor was reporting 0 m/s winds for excessive periods of time and appeared to 
measure lower wind speeds than nearby co-located wind sensors.  Sensor was replaced.

• Mean Wind Speed(wspd)