Data Quality Reports for Session: 185890 User: vghate Completed: 05/30/2017


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected Data Quality Metric
D100222.1GRW/WACR/M1 - Interference/False signalgrwwacrspeccmaskcopolM1.a0Suspect
D100729.5GRW/WACR/M1 - Reprocessed: Reflectivity and Height OffsetsgrwwacrspeccmaskcopolM1.a0Does not affect quality
D120301.1GRW/WACR/M1 - Transmit power drop outsgrwwacrspeccmaskcopolM1.a0Incorrect
D130725.3GRW/WACR/M1 - Incorrect value for antenna_altitude global attributegrwwacrspeccmaskcopolM1.a0Does not affect quality
D131016.2GRW/WACR/M1 - Reprocessing Notice (RID 992)grwwacrspeccmaskcopolM1.a0Does not affect quality


DQRID : D100222.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
09/25/2009094510/03/20091200Suspect
Subject:
GRW/WACR/M1 - Interference/False signal
DataStreams:grwwacrspeccmaskcopolM1.a0
Description:
Interference occurred between the WACR/SWACR beginning 9:45 GMT on 09/25.  This effect was 
not as noticeable on DQ plots until ~10 GMT on 09/27 at which time the interference was 
quite pronounced as vertical bands in the reflectivity and velocity plots.  The 
interference was slightly noticeable in the spectral width plots as well.  

Interference resulted from the SWACR using the same frequency as the WACR.  Interference 
was alleviated by changing the pulse repetition frequency (prf) from 10 kHz to 9.9 kHz.  
Some minor contamination still existed during the presence of highly reflective 
clouds/precipitation.

The Doppler velocity was not affected as much by the interference.  A cloud mask based on 
the Doppler velocity will remove most of this contamination in the reflectivity and 
spectra width measurements.
Measurements:grwwacrspeccmaskcopolM1.a0:
  • Reflectivity(Reflectivity)
  • Spectra(Spectra)
  • SignalToNoiseRatio
  • MMCR Spectral Width(SpectralWidth)


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DQRID : D100729.5
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/14/2009000001/06/20110800Does not affect quality
Subject:
GRW/WACR/M1 - Reprocessed: Reflectivity and Height Offsets
DataStreams:grwwacrspeccmaskcopolM1.a0
Description:
The instrument vendor informed us of a range (height) offset of 13 m and provided updated 
reflectivity calibration.  All values reported for 'Reflectivity' were approximately 3 dB 
too low.   In addition, the Reflectivity in the first and fourth range gates (starting 
from the surface) needed to be further corrected by an additional 2.7 and -0.9 dB, 
respectively. The 'height' field values were 13.33 m too low.  The data were reprocessed to 
correct these problems.

The grwwacrM1.b1 data were reprocessed and archived in October 2010.  The 
grwwacrspeccmaskcopolM1.a0 and grwwacrspeccmaskxpolM1.a0 data were reprocessed and archived in January 
2012.
Measurements:grwwacrspeccmaskcopolM1.a0:
  • Reflectivity(Reflectivity)
  • heights


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DQRID : D120301.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
07/27/2009162710/19/20101237Incorrect
Subject:
GRW/WACR/M1 - Transmit power drop outs
DataStreams:grwwacrspeccmaskcopolM1.a0
Description:
At approximately 16:27 GMT on 20090727, txpower began intermittently dropping out and 
reporting slightly negative values.  This issue continued intermittently through 20090807 
when it stopped occurring.  The problem resumed 20091006 and continued to occur on a daily 
basis until the monitor detector was replaced 20101019.

The transmit power as measured by the detector after replacement was approximately 1.3 dB 
less than when it failed.  Reflectivity measurements have a +0/-1.3 dBZ of additional 
uncertainty for this period of time.
Measurements:grwwacrspeccmaskcopolM1.a0:
  • txpower
  • Reflectivity(Reflectivity)


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DQRID : D130725.3
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/14/2009181310/06/20110859Does not affect quality
Subject:
GRW/WACR/M1 - Incorrect value for antenna_altitude global attribute
DataStreams:grwwacrspeccmaskcopolM1.a0
Description:
The global attribute antenna_altitude is incorrect.  The correct value should be 3.8608 m. 
 This is the height of the WACR antenna above the ground.  The value is used, along with 
site altitude, in converting heights above MSL to range above the radar antenna.
Measurements:grwwacrspeccmaskcopolM1.a0:
  • heights


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DQRID : D131016.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/14/2009181312/01/20091600Does not affect quality
Subject:
GRW/WACR/M1 - Reprocessing Notice (RID 992)
DataStreams:grwwacrspeccmaskcopolM1.a0
Description:
See below for details of reprocessing that was completed on 20140902.  Original DQR 
category: 5 (Transparent - Does not affect quality).

-----------------------------------------------------------

The global attribute 'antenna_diameter' has an incorrect value.  The correct antenna 
diameter is 48" or 1.22 m.
Measurements:grwwacrspeccmaskcopolM1.a0:
  • base_time


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