TWP/SONDE/C2  - Bad RH in lower 8km

It appears that the RH sensor heating circuit failed during this sounding.  The RH 
oscillates rapidly between low (~0 %RH) and not so low (ambient %RH) and the oscillation seems 
to stop when the temperature is below ~35 degC.  According to Vaisala these are symptoms 
of failure in the ASIC (application specific integrated circuit) that controls the heating.

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

TWP/SONDE/C2 - Surface Temperature Incorrect

The first two temperature values in the datafile are incorrect.  It appears that the 
observer mis-typed the surface temperature as -27 instead of +27.  The next value was 8 which 
is also incorrect and was caused by the system interpolating from the incorrect surface 
value and what the sonde temperature sensor was reading.

• Dry Bulb Temperature(tdry)

TWP/SONDE/C2 - Surface RH value incorrect

The surface RH value was incorrect.  It appears the observer mis-typed 70 instead of 80.  
This error also caused the dew point temperature to be incorrect.

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

TWP/SONDE/C2 - Surface RH value incorrect

The surface RH was reproted as 78%.  The value should have been in the low 50's.  It 
appears the observer did not allow the sonde to equilibrate to ambient conditions before 
taking the reading.  This error also caused an incorrect dew point.

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

TWP/SONDE/C2 - Surface RH Value incorrect

The surface value entered by the observers for RH (96%) is incorrect.  At the ascent time 
listed in the .ptu file the readings by the Sonde were around 65%.  This low RH value is 
supported by the nearby SMET tower RH reading of 71.8%.  This also caused the surface dew 
point to be incorrect.

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

TWP/SONDE/C2 - Surface RH too high

The surface Rh was entered as 94%.  The ascent time has 72% and this value is supported by 
RH values from the nearby SMET system.  This error also will affect the dew point.

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

TWP/SONDE/C2 - Broken temperature sensor at launch

Temperature sensor broken at launch.  All thermodynamic values are incorrect.

• Wind Direction(deg)
• Humidity, relative(rh)
• Dewpoint Temperature(dp)

TWP/SONDE/C2 - Broken temperature sensor at launch

The temperature sensor on this radiosonde broke after launch.  All the temperature-related 
data are incorrect.

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

TWP/SONDE/C2 - Bad RH values throughout sounding

RH values fluctuate largely in a stepping function throughout the sounding.  Suspect bad 
RH sensors.

• Humidity, relative(rh)

TWP/SONDE/C2 - Defective Temperature Sensor

Temperature sensor shows a +30C offset for duration of flight.

• Dry Bulb Temperature(tdry)

TWP/SONDE/C2 - Suspect RH values

RH values only are suspect for the duration of this radiosonde flight, exhibiting a 
"sawtooth" pattern.

• Humidity, relative(rh)

TWP/SONDE/C2 - Wind data missing

A GPS problem associated with Vaisala BBSS ground station software issues caused the 
ground stations to enter into an error state when using GPS wind finding. In some instances, 
the flight was aborted due to the error state and not data was collected.  A workaround 
was developed to allow sondes to be launched without collecting wind data.

• wstat
• Eastward Wind Component(u_wind)
• Northward Wind Component(v_wind)
• Mean Wind Speed(wspd)

TWP/SONDE/C2 - Incorrect latitude

Latitude incorrect:  When the new MRP111 card was installed on 08/08/2011, the DigiCORA 
software (v3.61.1) was also reloaded.  The latitude was incorrectly entered as +0.52.  It 
should have been entered as -0.52.  This mistake was corrected on 12/10/2011 when a 
compromised BBSS computer was replaced and the software reloaded.

Data will be reprocessed.

• lat

TWP/SONDE/C2 - Missing data

Date are missing and unrecoverable.

• lon
• Eastward Wind Component(u_wind)
• Northward Wind Component(v_wind)
• asc
• Humidity, relative(rh)
• base_time
• Dewpoint Temperature(dp)
• time_offset
• wstat
• Wind Direction(deg)
• alt
• Mean Wind Speed(wspd)
• Pressure, atmospheric, constant value of model level, RUC model output(pres)
• lat
• Dry Bulb Temperature(tdry)