SGP/SONDE/C1 - Bad temperature in SGP/CF sounding 20020108:0528

Temperature values in this sounding went from 3.5 degC at the surface to
-33.3 degC at the next sample.  It appears that all the remaining
temperature values have an approximate -35 degC offset.  The pressure
and RH values appear reasonable.

• Dry Bulb Temperature(tdry)
• Dewpoint Temperature(dp)

• Dry Bulb Temperature(tdry)
• Dewpoint Temperature(dp)

SGP/SONDE/C1 - CF sounding 20020522:1130 bad temperature/RH

It appears that the sonde sensor boom was damaged upon launch.  The result
is that no RH data are reported and the reported temperature is something on
the order of 60 degC too low.

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

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

SGP/SONDE/C1 - Bad T/RH data in CF sounding 20020523:1129

It appears that the sensor boom was damaged shortly after launch.  The
temperature reading jumps -60 degC and the RH goes to 0.

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

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

SGP/SONDE/C1 - CF sounding 20020609:0229 bad temp/rh/etc

The temperature and RH for this sounding look bad, either because of
interference from another sonde or because the temperature sensor was
broken on launch.  The sounding terminated early in any event.

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

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

SGP/SONDE/C1 - Incorrect Surface Pressure

It appears that the operator made a typographical error when entering the
surface pressure.  The file has 987.0 hPa and it probably should be 978.0
which would be consistent with the first sample provided by the radiosonde
(977.3 hPa), the surface pressures recorded for the adjacent soundings, and
the THWAPS pressure.

Because the sounding altitude is calculated assuming the surface pressure
is correct, the altitude values for the entire flight and the ascent rate 
values for the first 30 seconds of the sounding will be incorrect.

• alt
• asc

• alt
• asc

SGP/SONDE/C1 - Bad Temperature Sensor

It appears that the temperature sensor broke shortly after launch.  As a
result, the temperature and dewpoint values are incorrect.

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

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

SGP/SONDE/C1 - Temperature sensor failure

Temperature sensor broke at launch.  All temperature-related variables
are incorrect.

• Water vapor, total integrated from radiosonde(integ_vap_sonde)
• integ_vap_sonde_direct

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

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

SGP/SONDE/C1 - Bad Temperature Sensor

It appears that the temperature sensor broke upon launch and therefore the reported 
temperature is approximately 40 degC too low.

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

• Water vapor, total integrated from radiosonde(integ_vap_sonde)

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

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

SGP/SONDE/C1 - Bad Temperature Sensor

It appears that the temperature sensor broke shortly after launch. Temperatures are offset 
by approxmiately (but not constantly) 40 degC.

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

• Water vapor, total integrated from radiosonde(integ_vap_sonde)

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

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

Bad temperature sensor

It appears that the temperture sensor broke a few seconds into flight.  This results in an 
unreasonably low temperature for the rest of the flight.  For some reason, the rh values 
also go missing shortly after launch.  Only the wind and pressure data are reliable.

• Humidity, relative(rh)
• Dry Bulb Temperature(tdry)
• alt

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

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

SGP/SONDE/C1 - Questionable RH: CF sounding 11/13/2002:2044

The RH data in this sounding is erratic between 2km and 10 km, oscillating between 
reasonable values (~40%RH) and zero.  I certainly doubt that this is a real, heretofore 
unreported, atmospheric phenomenon so I have to conclude that something is probably wrong with 
the sensor.  I have not seen this behavior before.  One would have to look at the 
absolutely raw RH data to explore further.

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

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

SGP/SONDE/C1 - Contaminated by interference

These three soundings are contaminated by interference from another radiosonde.  It is not 
clear why; this doesn't usually happen at the CF where the operators are very 
experienced and frequency separation is not usually a problem.

• Raw data stream - documentation not supported

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

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

SGP/SONDE/C1 - Interference CF sounding 20021120:0225

Like several soundings on 11/19, this sounding was affected by interference from another 
radiosonde.

• Raw data stream - documentation not supported

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

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

SGP/SONDE/C1 - Questionable RH CF sounding 0211211:1130

The RH samples in this sounding oscillate between reasonable values (60-80%) and zero.  
This may be a problem with the RH sensor or the software that alternates between the heated 
and non-heated RH elements.  In either case, the reported values are questionable.  More 
investigation of the raw binary data would be required to diagnose further.

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

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

SGP/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry

The output precision of the following variables was increased 20060928

alt  changed from 1m to 0.1m
dp   changed from 0.1degC to 0.01degC
pres changed from 0.1 hPa to 0.01 hPa
RH   changed from 1%RH to 0.01%RH
tdry changed from .1degC to 0.01degC

Note that the increase in precision does not necessarily imply an increase in accuracy.  
Users are cautioned to continue to use their best scientific judgement when using these or 
any other data.

• alt
• Dry Bulb Temperature(tdry)
• Dewpoint Temperature(dp)
• Humidity, relative(rh)
• Pressure, atmospheric, constant value of model level, RUC model output(pres)

SGP/SONDE/C1 - Sensor failure

Temperature sensor failure on sonde.  Data is incorrect, do not use.

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