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20010606: Decoding upper-air data manually with dcuair: time problem

Christian,

The decoded data are correct. The nominal sounding time is 7Z. The decoder will 
store all 
soundings between 0530Z and 0730Z as a 6Z report. 

The WMO broadcast time of the bulletins are: CYVP 061240

This header time has nothing to do with the observation tinme of the sounding. 
The sounding
date/time are provided in the upperair code below as: 5607x

The date/time group is interpretes as: 
56 = 6th day of month (with 50 added for wind speeds in knots)
07 =  the sounding observation nominal time, eg 7Z. This is stored in the 
decoded data
        as STIM = 0700.
the last of the 5 digits, x, is the termination level for data in the 
individual section.
Eg, in the TTAA part, 56071, means that the data terminates below 100mb.

The decoder bins the report times in the 3 hourly windows since a sounding takes
some period of time to complete, typically over 1 hour. In this way, a 12 
sounding
can be between 1130Z and 1330Z. This allows for replacement launches due to 
failure
in the sounding equipment to be grouped in the appropriate time window.


Steve Chiswell
Unidata User Support


>From: Christian Page <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200106061454.f56Es8p25863

>
>Hi,
>
>I am archiving upper-air data from one station in WMO format. When I try to do
> ce
>it with dcuair, everything seems fine, except that when I try to list the data
>with snlist, it displays wrong time. I tried running dcuair with the -c arg or
>without with the same results. Any idea what is wrong?
>
>dcuair log:
>[524225] 010606/1045 [DC 3]  Starting up.
>[524225] 010606/1045 [DC -9]  End of input data file.
>[524225] 010606/1045 [DC 5]  Normal termination.
>[524225] 010606/1045 [DC 2]  Number of bulletins read and processed: 4
>[524225] 010606/1045 [DC 6]  Shutting down.
>
>dcuair command:
>/io/gempak/GEMPAK5.6/bin/irix/dcuair -c 010606/1200 \
>-p /io/gempak/GEMPAK5.6/gempak/tables/pack/snmerg.pack \
>-s /io/gempak/GEMPAK5.6/gempak/tables/stns/snworld.tbl \
>/io/page/yvp521468.dir/yvp521468 < /io/ldm/data/upperair/20010606_CYVP.wmo
>
>
>SNLIST RUN dump:
>
>
> SNFILE    Sounding data file                /io/page/yvp521468.dir/yvp521468
> AREA      Data area                         @YVP
> DATTIM    Date/time                         all
> SNPARM    Sounding parameter list           dset
> STNDEX    Stability indices                 SHOW
> LEVELS    Vertical levels                   all
> VCOORD    Vertical coordinate type          PRES
> OUTPUT    Output device/filename            T
> MRGDAT    Merge data file flag/part type    YES
> Parameters requested: SNFILE,AREA,DATTIM,SNPARM,STNDEX,LEVELS,VCOORD,OUTPUT,
> MRGDAT.
> GEMPAK-SNLIST>r
>
> SNPARM = PRES;TEMP;DWPT;DRCT;SPED;HGHT
> STNPRM = SHOW
>
> STID = YVP           STNM =    71906   TIME = 010606/0600
> SLAT =  58.10     SLON =   -68.42   SELV =    37.0
> STIM =   700
>
> SHOW =    11.15
>
>      PRES     TEMP     DWPT     DRCT     SPED     HGHT
>   1008.00     2.60    -2.30    30.00     5.00    37.00
>   1000.00     1.40    -3.60    25.00     7.00   123.00
>    991.00     0.40    -4.40    26.16     7.12   195.64
>    925.00    -1.90    -7.90    35.00     8.00   746.00
>---- cutted ---
>
>WMO file:
>
>^A^M^M
>709 ^M^M
>UFCN91 CYVP 061240^M^M
>71906 TTCC 56077 71906 70863 50784 25506 88999 77999=^M^M
>71906 TTDD 5607/ 71906 11945 48784 22849 51383=^M^M
>^M^M
>^C^A^M^M
>741 ^M^M
>UKCN90 CYVP 061240^M^M
>71906 TTBB 56076 71906 00008 02649 11991 00448 22910 02157 33870^M^M
>00757 44854 01558 55800 05744 66789 04967 77773 04169 88727 05766^M^M
>99644 12574 11614 15565 22606 15976 33556 20967 44515 23979 55425^M^M
>32579 66366 36378 77277 46769 88269 44376 99233 48184 11223 46185^M^M
>22206 46985 33200 45585 44171 48384 55160 46585 66154 48384 77150^M^M
>47185 88126 48784 99121 50384 11110 48784 22100 49184 31313 46106^M^M
>80717=^M^M
>^M^M
>^C^A^M^M
>767 ^M^M
>USCN90 CYVP 061240^M^M
>71906 TTAA 56071 71906 99008 02649 03010 00123 01450 02514 92746^M^M
>01956 03515 85421 01958 30012 70946 07965 30016 50547 24781 24523^M^M
>40706 34181 22036 30904 43969 21054 25025 46585 23031 20173 45585^M^M
>27524 15364 47185 26017 10630 49384 31016 88277 46769 22042 77999=^M^M
>^M^M
>^C^A^M^M
>593 ^M^M
>UFCN91 CYVP 061340 CCA^M^M
>71906 TTCC 56071 71906 70863 50784 25506 50083 49584 04009 30417^M^M
>50984 10520 20682 47185 10018 10152 37988 10504 88999 77999=^M^M
>71906 TTDD 5607/ 71906 11945 48784 22849 51383 33511 49184 44297^M^M
>51184 55098 37788 66083 32989 77081 31590 88078 253// 51515 10168^M^M
>00808 51515 10190 07406=^M^M
>^M^M
>^C
>
>
>Christian Page
>address@hidden    http://meteocentre.com/toulouse/
>
>Visiteur scientifique Tel:05 61 07 82 69
>CNRM/GMEI/MNP et SCEM/PREVI/AERO/DP
>
>
>