PYE/MET/M1 - Data questionable

During the listed time period, the AMF was in the beginning phase of deployment.  Data 
during this time may not be representative and should be used with caution.

• Vapor pressure mean(vappress_mean)
• up_wind_dir_sd
• Wind speed, lower, 1-min avg(lo_wind_spd_arith_avg)
• precip_sd
• relh_sd
• Wind speed, lower, 1-min minimum(lo_wind_spd_min)
• Relative humidity mean(relh_mean)
• Precipitation maximum(precip_max)
• lo_wind_spd_sd
• up_wind_spd_sd
• Precipitation mean(precip_mean)
• Wind speed, lower, 1-min vector avg(lo_wind_spd_vec_avg)
• Wind direction, vector, lower, 1-min avg(lo_wind_dir_vec_avg)
• temp_sd
• Wind speed, upper, 1-min vector avg(up_wind_spd_vec_avg)
• Atmospheric pressure(atmos_pressure)
• Wind speed, upper, 1-min avg(up_wind_spd_arith_avg)
• Precipitation minimum(precip_min)
• alt
• Wind speed, lower, 1-min maximum(lo_wind_spd_max)
• internal_voltage
• Wind direction, vector, upper, 1-min avg(up_wind_dir_vec_avg)
• Wind speed, upper, 1-min maximum(up_wind_spd_max)
• Temperature mean(temp_mean)
• lo_wind_dir_sd
• logger_temp
• vappress_sd
• Wind speed, upper, 1-min minimum(up_wind_spd_min)

PYE/SONDE/M1 - Broken RH sensor

One of the RH sensors on this radiosonde was bad.  The RH oscillates rapidly between near 
0 and ambient up to approximately 11 km.  The near-zero values are incorrect.

• Humidity, relative(rh)
• Dewpoint Temperature(dp)

PYE/SONDE/M1 - Bad temperature and RH

The temperature appears to be approximately 10 degC too high during the entire sounding.  
This also causes the RH to be too low.  Most likely the problem was a bad temperature 
sensor.

• Humidity, relative(rh)
• Dry Bulb Temperature(tdry)
• Dewpoint Temperature(dp)

PYE/SONDE/M1 - Bad RH sensor

The RH sensor heating circuit failed on this sounding.  RH values during the first part of 
the sounding oscillate between a reasonable value and a very low value.  It appears that 
(a) the heating was out of phase, and (b) incorrect values were being reported during 
the first 10 minutes or so of flight.

• Humidity, relative(rh)
• Dewpoint Temperature(dp)

PYE/SONDE/M1 - Bad RH sensor

Two problems here - failure of the RH sensor heating circuit and a bad RH sensor.

• Humidity, relative(rh)
• Dewpoint Temperature(dp)

PYE/SMET/M1 - Reprocess: ORG Data has very small rainrate values

The ORG data is collected via analog signal and not digital.  Therefore, we
   continuously collect data even when no rain is occurring.  We also capture
   small events such as leaves, large bugs, dust, etc blowing through the
   measurement path.  Because this discrete event occurs quickly the value is
   usually captured for 1 or 2 seconds.  This value is then averaged to the
   minute producing rainrate on the order of .009 mm/hr or less.  These values
   are not indicative of rain and should be removed from the record or summing
   over long periods can bias the climate record.  We are reprocessing the data
   to remove these small values and are adjusting the collection program to
   remove them before ingest.

• precip_sd
• Precipitation mean(precip_mean)
• Precipitation minimum(precip_min)
• Precipitation maximum(precip_max)

PYE/SMET/M1 - Wind Speed data contain offset due to induced voltage

The marine model of the RM Young wind sensor needs twisted pair shielded cable.  The 
manufacturer did not originally supply the pigtail with twisted pair shielded cable.  Use of 
twisted pair shielded cable for the rest of the cable run to the logger was also not 
specified.  This caused an induced voltage in the wind speed line from the wind direction 
excitation.  The induced voltage varied from sensor to sensor and probably changed anytime 
the cable was replaced or parts of the wind sensor were repaired or replaced. The induced 
voltage has been seen to vary from 0.15 m/s to as much as 1.08 m/s.

• Wind speed, upper, 1-min maximum(up_wind_spd_max)
• Wind speed, upper, 1-min vector avg(up_wind_spd_vec_avg)
• lo_wind_spd_sd
• Wind speed, lower, 1-min avg(lo_wind_spd_arith_avg)
• up_wind_spd_sd
• Wind speed, lower, 1-min vector avg(lo_wind_spd_vec_avg)
• Wind speed, lower, 1-min minimum(lo_wind_spd_min)
• Wind speed, upper, 1-min avg(up_wind_spd_arith_avg)
• Wind speed, lower, 1-min maximum(lo_wind_spd_max)
• Wind speed, upper, 1-min minimum(up_wind_spd_min)

PYE/VCEIL/M1 - Reprocess: Incorrect serial_number and sum_backscatter fields

Attribute serial_number: In most cases, this field is not representative of the actual 
serial number of the instrument because the value did not change when an instrument changed 
locations or was replaced with a spare.
   
Variable sum_backscatter: An out-of-range condition for the "sum of detected and 
normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 
0.0999 /srad.

• sum_backscatter