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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 39 U.S. stations (Blocks 72 and 74) were cited at least
once; 17 were cited at least twice; and 7 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
                    72645/GRB   1               5        6
                    72250/BRO                   5        5
                    72403/LWX   5                        5
                    72393/VBG   4                        4

Ground equipment failures were reported from station GRB from the 1st through
the 3rd and from station BRO from the 28th through the 30th.  Manual deletions
of temperature and moisture were the most common QC actions at stations LWX and
VBG due to super-adiabatic lapse rates.

(2)  Reports from 36 stations in blocks 04, 70, 71, 76, 78 and 91 were cited
at least once; 21 were cited at least twice; and 14 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
                    76405/LAP                  26       26
                    76654/MZL   2              20   3   25
                    76458/MZT   1              20   1   22
                    76692/HYY   2              16   1   19
                    78988/CUR  10   3           8       19*
                    78384/GCM                   6        6
                    70414/SYA   1               3        4
                    91348/PNI   3               1        4

Flight equipment failures were reported by LAP, MZL, MZY, and HYY throughout
the month.  Station CUR reported ground equipment failures for the first half
of the month, and GCM reported ground equipment failures from the 24th through
the 30th. At station PNI, all manual deletions were due to super-adiabatic
lapse rates.  At CUR, however, deletions occurred for a variety of reasons
including super-adiabatic lapse rates, spurious height and temperature data,
and baseline errors.  

* 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/