NSA/TWR/C1 - 40m T/RH sensor noise

40m T/RH sensor spiked on 5/17/12, then remained noisy mostly at high humidity. Sensor 
replacement during tower maintenance on 8/1/12 has resolved the issue.

• Air temperature, standard deviation(temp_std)
• Relative humidity observed by the Raman lidar(rh_mean)
• Temperature mean(temp_mean)
• Temperature and relative humidity sensor error code(trh_err_code)
• Dew point standard deviation(dew_point_std)
• Vapor pressure mean, calculated(vapor_pressure_mean)
• Vapor pressure standard deviation(vapor_pressure_std)
• Dew point mean, calculated(dew_point_mean)
• Standard deviation in logger enclosure relative humidity(rh_std)