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SUBJECT:        Monthly Raob Data Report of Manual Quality Control


The Raob Report for April, compiled from the Raob Recap statements in the
SDM logs, which does not necessarily include data that were rejected by
automated computer generated quality control, indicates the following:

(1)  Reports from 30 U.S. stations (Blocks 72 and 74) were cited at least
once; 10 were cited at least twice; and 2 were cited at least three times.
Of those, the following were cited more than three times or had two or more no
reports:

                    STATION__ DEL BAS COR XRP EFL SHO TOTAL

(2)  Reports from 37 stations in blocks 04, 70, 71, 76, 78 and 91 were cited
at least once; 21 were cited at least twice; and 15 were cited at least three
times.  Of those, the following were cited more than three times or had two or
more no reports:

                    STATION__ DEL BAS COR XRP EFL SHO TOTAL
                    91348/PNI                  33   1   33*
                    76458/MZT                  32       32
                    76654/MZL   3              24       27
                    76526/ZAC  16   4                   16*
                    76805/ACA                  10   1   11
                    76256/GYM                   8        8
                    78954/BGI   5               2        7
                    76679/MEX   6                        6
                    78866/SXM   2                   4    6
                    70361/YAK                   5        5
                    91765/PPG   4               1        5
                    76692/HYY   3               1        4
                    78016/BDA   3                   1    4
                    70414/SYA   1   1           2        4

There were many equipment failures this month.  PNI and YAK primarily reported
ground equipment failures, while MZT, MZL, ACA, and GYM all reported many 
flight equipment failures in April. There was one station, SXM, that had several 
instances throughout the month of April of flight terminations below 400 mb. All
other issues were for manual deletions of data.  Heights and temperatures were
deleted from MZL, ZAC, MEX, and HYY.  Temperatures and moisture were manually
deleted from BGI, PPG, and BDA due to super-adiabatic lapse rates.  Finally,
BGI also had a few obs in which winds were deleted due to problematic wind 
speeds and directions. 

* The total differs from the sum of the itemized citations
  because of multiple citations in the same raob(s).


Citation Codes Key:
DEL  All or part of the raob was flagged for deletion.
BAS  A baseline hgt/station press error was corrected or purged.
COR  At least one correction other than baseline was made.
XRP  Station sent no report at all when one was required.
EFL  Equipment failure (codes 10142, 10144, 10158, etc.)
SHO  Raob flight was short; ie, to less than 400 mb.


This and related reports are available on the Web at . . .
http://www.nco.ncep.noaa.gov/sib/qap/raobqc/