DQRID : D140822.12
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/15/2008000012/28/20082359Suspect
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Subject:
HFE/MERGESONDE/M1 - Suspect rh_scaled values
DataStreams:hfemergesonde1maceM1.c1
Description:
MERGESONDE sometimes uses bad or questionable precipitable water vapor data to scale the 
relative humidity profiles provided by the rh_scaled field. In addition, this bad input 
data is not properly indicated by the vapor_source or qc_rh_scaled fields. This problem 
appears to typically occur when there is moisture impacting the microwave radiometer causing 
large spikes in brightness temperatures. During these periods the rh_scaled values are 
often saturated at 101% for much of the profile. 

A new version of the MERGESONDE VAP has corrected this problem, and these data will 
eventually be corrected by a reprocessing task.
Suggestions: 
Take care when using the data from the rh_scaled field, particularly during 

precipitation events. Check the stat2_pwv field from the MWRRET VAP, and/or the vap field from 
the MWR instrument for problems before using these data.
Measurements:hfemergesonde1maceM1.c1:
  • rh_scaled
  • vapor_source
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