DQRID : D990505.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
09/22/1998000004/21/19992100Suspect
more
Subject:
Bug in processing of vapor sensing aircraft
DataStreams:nsaacarsX1.a1, twpacarsX1.a1, sgpacarsX1.a1, gecacarsX1.a1
Description:
Message from Bill Moninger, Forecast Systems Laboratory
on April 29, 1999

Today, we implemented changes in the ACARS QC processing that effect the 
dewpoint data in both the java and non-java displays, as well as in the 
downloadable netCDF data.

The new netCDF version number is 2.2.  We processed this data retroactively
for a few hours, so this version starts at 21 UTC on 28 April 1999.

This version fixed a bug in the processing of vapor-sensing aircraft that 
caused the dewpoint to be 0 degree to 5 degree (C) too cold, with the largest errors 
occurring at high mach numbers (which occur at high altitudes). 
Generally errors in dewpoint below 15,000 ft have been less than 3 degree C.
Suggestions: 
Measurements:nsaacarsX1.a1:
  • minSecs
  • timeObs
  • windSpeedError
  • altitude
  • interpolatedTime
  • rh_probe
  • maxTurbulence
  • rollFlag
  • maxSecs
  • interpolatedLL
  • latitude
  • errorType
  • windDirError
  • destAirport
  • correctedFlag
  • missingInputMinutes
  • timeReceived
  • maxDate
  • origAirport
  • heading
  • dataDescriptor
  • temperature
  • minDate
  • longitude
  • waterVaporMR
  • medTurbulence
  • tempError
  • en_tailNumber
  • bounceError
  • waterVaporQC
  • windSpeed
  • speedError
  • dewpoint
  • rptStation
  • mach
  • windDir
  • vertAccel
more
twpacarsX1.a1:
  • tempError
  • bounceError
  • heading
  • destAirport
  • vertAccel
  • windSpeed
  • longitude
  • windDirError
  • correctedFlag
  • rh_probe
  • windSpeedError
  • waterVaporMR
  • speedError
  • temperature
  • timeObs
  • latitude
  • dewpoint
  • maxTurbulence
  • mach
  • maxDate
  • minDate
  • rptStation
  • timeReceived
  • medTurbulence
  • windDir
  • interpolatedTime
  • interpolatedLL
  • missingInputMinutes
  • dataDescriptor
  • minSecs
  • maxSecs
  • origAirport
  • en_tailNumber
  • waterVaporQC
  • altitude
  • errorType
  • rollFlag
more
sgpacarsX1.a1:
  • minSecs
  • correctedFlag
  • temperature
  • speedError
  • medTurbulence
  • missingInputMinutes
  • en_tailNumber
  • dataDescriptor
  • waterVaporMR
  • timeObs
  • errorType
  • dewpoint
  • origAirport
  • mach
  • minDate
  • destAirport
  • tempError
  • windDir
  • maxDate
  • altitude
  • heading
  • rptStation
  • rollFlag
  • latitude
  • maxTurbulence
  • interpolatedLL
  • windDirError
  • interpolatedTime
  • longitude
  • timeReceived
  • waterVaporQC
  • windSpeedError
  • windSpeed
  • vertAccel
  • maxSecs
  • rh_probe
  • bounceError
more
gecacarsX1.a1:
  • rh_probe
  • dataDescriptor
  • destAirport
  • maxTurbulence
  • dewpoint
  • latitude
  • altitude
  • maxDate
  • origAirport
  • minDate
  • errorType
  • timeReceived
  • rollFlag
  • waterVaporQC
  • interpolatedTime
  • heading
  • temperature
  • minSecs
  • timeObs
  • windSpeedError
  • longitude
  • mach
  • maxSecs
  • windDirError
  • interpolatedLL
  • windSpeed
  • vertAccel
  • tempError
  • correctedFlag
  • missingInputMinutes
  • speedError
  • en_tailNumber
  • medTurbulence
  • bounceError
  • rptStation
  • waterVaporMR
  • windDir
more

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