QC criteria Criteria for assigning QC flags within automated procedure:

************   Gross limit checks   *****************************

parameter          test                            flag       data point 
                                                   applied    flagged
 
Pressure        ge 1050 hPa                         bad        curr
                lt    0 hPa                         bad        curr 
                ge 1030 hPa and abs(lat) .le. 20    bad        curr 

Geopotential    gt 40000 m                          ques       curr
Height          lt     0 m                          bad        curr 

Temperature     gt 50 C                             bad        curr
                lt -110. C                          bad        curr
                45 to  50 C                         ques       curr
               -110 to  -100 C                      ques       curr
                gt -5 C and p < 400 mb              ques       curr
                gt -20 C and p < 300 mb             ques       curr
                gt -30 C and 300 < p < 20 mb        ques       curr
                gt -40 C and 100 < p < 25 mb        ques       curr

Dewpoint        gt 40 C                             bad        curr
Temperature     35 to 40 C                          ques       curr
                if T ques                           ques       curr
                if T bad                            bad        curr
                lt -99.9, Td=-99.9                  est        curr
                Td > T,   Td=T                      ques       curr

Total Wind      gt 100 m/s                          bad        curr
Speed           lt   0 m/s                          bad        curr
                gt  70 m/s                          ques       curr

Wind Direction  lt 0 or gt 360                      bad        curr        

U-component     lt -100 or gt 100                   bad        curr
                lt  -70 or gt  70                   ques       curr

V-component     lt -100 or gt 100                   bad        curr
                lt  -70 or gt  70                   ques       curr

   
*******************  Vertical consistency checks  ***************

parameter          test                            flag       data point 
                                                   applied    flagged
 
Pressure        p increase/equal with hgt           bad        curr

Geopotential    z decrease/equal with hgt           bad        curr

dT/Dz           at sfc, |dtdz| > 1 C/10m
                        and dp > 5 hPa              ques       curr, prev 
                for dp .lt. 5
                 dtdz  < -1 C/10m                   ques       curr, prev 
                 dtdz  < -2 C/10m                   bad        curr, prev 
                 dtdz  >  1 C/10m *                 ques       curr, prev
                 dtdz  >  2 C/10m *                 bad        curr, prev
                for dp .ge. 5
                 dtdz  < -15 C/km                   ques       curr, prev 
                 dtdz  < -30 C/km                   bad        curr, prev 
                 dtdz  >  15 C/km *                 ques       curr, prev
                 dtdz  >  30 C/km *                 bad        curr, prev
                * applied at 
                 p < 150 hPa for abs(lat) < 25
                 p < 250 hPa for abs(lat) ge 25

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