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20020606: generating skewt from mobile soundings

>From: Darren Gallant <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200206061740.g56HeXJ15649

>Dear Unidata Support,
>
>I'm attempting to create skewts from NSSL mobile soundings systems.
>Soundings typically have fewer than 300 levels, but the station locations
>move. Can I create a station table foreach sounding using a timestamp as a
>stn_id ?
>
>What command(s) would I use to write the sounding data into a gempak file?
>I know what paramaters to write and I would use the default packing table.
>Once the gempak file is created, generating a skewt is easy.
>
>Thanks
>
>Darren R. Gallant              UCAR/JOSS
>Programmer/Technician           Joint OfFice Of Science Support
>303-497-2634                    P.O. Box 3000
>address@hidden                Boulder,CO 80307-30000
>
>

Darren,

You don't even have to have a station table for SNEDIT because it
will create the output file if it doesn't exist.

The Station ID (STID) can be up to 8 characters (beginning with a letter).
You can use a 6 digit STNM so that your sounding numbers aren't confused with 
WMO numbers.

The easiest way to create unique station IDS is to either
consecutively number them, eg NSSL0001, NSSL0002, or, use the 
julian day, hour, minute like N1571200 to represent
a 1200Z sounding on Day 157. Then use a STNM like 900001, 900002 etc.

A sample set of aircraft soundings I collected in ASTEX is on line
at:
http://www.unidata.ucar.edu/packages/gempak/tutorial/astex.dat

You can download this ascii file and create a GEMPAK file in SNEDIT
with:

 SNEFIL   = astex.dat
 SNFILE   = testme_upa.gem
 TIMSTN   = 300/1000
 GEMPAK-SNEDIT>r

 SNEDIT PARAMETERS: 

 Output sounding file: testme_upa.gem
 This file has been created.

 The following parameters are in the file: 
 THTA ALAT ALON PRES HGHT TMPC DWPC SSTC SPED DRCT

Enter <cr> to accept parameters or type EXIT:
 [SNEDIT 1]  Data for 11A1 at 920618/2230 has been added to the file.
 [SNEDIT 1]  Data for 11A2 at 920619/0045 has been added to the file.
 [SNEDIT 1]  Data for 11B1 at 920619/0255 has been added to the file.
 [SNEDIT 1]  Data for 11B2 at 920619/0310 has been added to the file.
 [SNEDIT 1]  Data for 12A1 at 920619/1030 has been added to the file.
 [SNEDIT 1]  Data for 12A2 at 920619/1305 has been added to the file.
 [SNEDIT 1]  Data for 12B1 at 920619/1540 has been added to the file.
 [SNEDIT 1]  Data for 12B2 at 920619/1600 has been added to the file.
 [SNEDIT 1]  Data for 13A1 at 920619/2230 has been added to the file.
 [SNEDIT 1]  Data for 13A2 at 920620/0110 has been added to the file.
 [SNEDIT 1]  Data for 13B1 at 920620/0340 has been added to the file.
 [SNEDIT 1]  Data for 13B2 at 920620/0405 has been added to the file.
 [SNEDIT 1]  Data for 14A1 at 920620/1050 has been added to the file.
 [SNEDIT 1]  Data for 14A2 at 920620/1310 has been added to the file.
 [SNEDIT 1]  Data for 14B1 at 920620/1610 has been added to the file.

Steve Chiswell