D Q R Report

DQRID : D990505.1

Start Date	Start Time	End Date	End Time	Data Quality Metric
09/22/1998	0000	04/21/1999	2100	Suspect

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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