Table 10.   Reason codes associated with step "PREVENT", program code 004 (last revised 2/14/2018).
 

KEY:
     IN "R.CODE" COLUMN:
                                           B - OCCURS IN ALL OPERATIONAL VERSIONS OF PREVENT. 
                                           N - CURRENTLY DOES NOT OCCUR IN ANY OPERATIONAL VERSION OF PREVENT.

 
R.CODE MEANING MNEMONICS AFFECTED AND NEW VALUE FOR OBS, Q.M.
01 B PRESSURE OBSERVATION ON ANY LEVEL IS MORE THAN 100 MB BELOW MODEL (GUESS) SURFACE PRESSURE. ALL DATA ON LEVEL REJECTED. PRC-> PQM=8
TRC-> TQM=8
QRC-> QQM=8
WRC-> WQM=8
02 B PRESSURE OBSERVATION ON ANY LEVEL IS ZERO OR NEGATIVE. ALL DATA ON LEVEL REJECTED. PRC-> PQM=8
TRC-> TQM=8
QRC-> QQM=8
WRC-> WQM=8
02 B SURFACE PRESSURE OBSERVATION IS ABOVE 450 MB OR BELOW 1100 MB. ALL DATA ON SURFACE MASS LEVEL REJECTED.  PRC-> PQM=8 (see % below)
TRC-> TQM=8 (see % below)
QRC-> QQM=8 (see % below)
02 B TEMPERATURE ON ANY LEVEL IS MISSING OR LESS THAN -150 DEG. CELSIUS. SPECIFIC HUMIDITY ON LEVEL REJECTED. QRC-> QQM=8 (see % below)
02 B SPECIFIC HUMIDITY OBSERVATION IS ZERO OR NEGATIVE. SPECIFIC HUMIDITY ON LEVEL REJECTED. QRC-> QQM=8 (see % below)
03 B SURFACE PRESSURE OBSERVATION ERROR VALUE IS MISSING. ALL MASS DATA ON SURFACE LEVEL REJECTED. PRC-> PQM=9
TRC-> TQM=9
QRC-> QQM=9
03 B TEMPERATURE OBSERVATION ERROR VALUE ON ANY LEVEL IS MISSING. TEMPERATURE AND SPECIFIC HUMIDITY ON LEVEL REJECTED. TRC-> TQM=9
QRC-> QQM=9
03 B SPECIFIC HUMIDITY OBSERVATION ERROR VALUE ON ANY LEVEL IS MISSING. SPECIFIC HUMIDITY ON LEVEL REJECTED. QRC-> QQM=9
03 B  WIND OBSERVATION ERROR VALUE ON ANY LEVEL IS MISSING. U- AND V-COMP WIND ON LEVEL REJECTED. WRC-> WQM=9
03 B TOTAL COLUMN PRECIPITABLE WATER OBSERVATION ERROR IS MISSING. TOTAL COLUMN PRECIPITABLE WATER REJECTED. PWR-> PWQ=9
04 B SURFACE PRESSURE IS MORE THAN 100 MB ABOVE OR BELOW MODEL (GUESS) SURFACE PRESSURE. ALL MASS DATA ON SURFACE LEVEL REJECTED.  PRC-> PQM=8 (see % below)
TRC-> TQM=8 (see % below)
QRC-> QQM=8 (see % below)
05 B  PRESSURE ON ANY LEVEL IS ABOVE 300 MB. SPECIFIC HUMIDITY ON LEVEL REJECTED. QRC-> QQM=9
06 N  AN OVERLAND TOVS CLEAR, PARTLY-CLOUDY OR CLOUDY SATELLITE TEMPERATURE SOUNDING REPORT AT OR NORTH OF 60 DEGREES SOUTH LATITUDE WITH PRESSURE ON LEVEL AT OR BELOW 100 MB.  TEMPERATURE ON LEVEL REJECTED. TRC-> TQM=8 (see % below)
QRC-> QQM=8 (see % below)
06 N AN OVERLAND TOVS PARTLY-CLOUDY OR CLOUDY SATELLITE TEMPERATURE SOUNDING REPORT SOUTH OF 60 DEGREES SOUTH LATITUDE WITH PRESSURE ON LEVEL BELOW 100 MB.   TEMPERATURE ON LEVEL REJECTED. TRC-> TQM=8 (see % below)
QRC-> QQM=8 (see % below)
07 N AN OVERLAND OR OCEANIC CLEAR, PARTLY-CLOUDY OR CLOUDY SATELLITE (TOVS, GOES, DMSP) TEMPERATURE SOUNDING REPORT.  SPECIFIC HUMIDITY ON ALL LEVELS REJECTED. QRC-> QQM=8 (see % below)
08 B SURFACE MARINE WIND OBSERVATION IS REPORTED AS CALM, BUT MODEL (GUESS) SURFACE MARINE WIND IS GREATER THAN 5 m/s.  SURFACE MARINE WIND OBSERVATION IS REJECTED. WRC-> WQM=8

% - PRIOR TO 12/04/2007 THE QUALITY MARKER WAS SET TO 9 IN THIS CASE.