20050524: 20050519: Gempak - adding surface parameters

Thomas,

You do not have to use the metar packing file to create your surface data set.
Whatever you are using to decode/create a gempak file from your data set
can define any quantity as a 4 leter variable name, such as
FXSH and FXLH and store those in the data file. If you are using
SFCFIL to create your gempak file, you can provide the parameter names
in SFPRMF or create you own packing file.

The limit to the number of parameters that can be stored in a GEMPAK file is 
defined
by the MMPARM variable, and is set to 40 when built by default.

Once you have FXSH and FXLH in your gempak surface file, you can plot them with 
sfgram.

If you are merging data from other data sources, you would create your surface 
file with
sfcfil to include all parameters you are using from both files, and then use 
sfmod to copy 
data from your data sets into the new data file.

Steve Chiswell
Unidata User Support


>From: address@hidden
>Organization: UCAR/Unidata
>Keywords: 200505242138.j4OLcsP3023296

>My dataset has measurments of latent and sensible heat fluxes included, I just
>want to produce a meteogram of those two quantities. My gempak doesn't
>recognize FXSH and FXLH as surface parameters (at least not in METAR.PAK), do
>you have an idea how to help me produce the meteogram ?
>
>Thanks
>Thomas Milewski
>
>Selon Unidata Support <address@hidden>:
>
>> >From: "Thomas Milewski" <address@hidden>
>> >Organization: UCAR/Unidata
>> >Keywords: 200505191921.j4JJL0Km015924
>>
>> >Institution: McGill University
>> >Package Version: 5.7.4
>> >Operating System: Unix
>> >Hardware Information: fast enough
>> >Inquiry: I'm trying to produce a meteogram (sfgram) including
>> latent/sensible
>> > heat fluxes but those parameters are not included in sfparm. How can I add
>> th
>> > em?
>> >
>> >
>> >
>>
>> Thomas,
>>
>> Your data set would have to provide those measurements and store them in the
>> file.
>> This is not a parameter that decoded from a standard metar report.
>>
>> The sensible and latent heat fluxes (FXSH and FXLH) are provided in the RUC
>> grid #252 and NAM grid #212 grids available through CONDUIT, and could be
>> interpolated to
>> station locations using the gdgsfc program.
>>
>> Steve Chiswell
>> --
>> ****************************************************************************
>> Unidata User Support                                    UCAR Unidata Program
>> (303)497-8643                                                  P.O. Box 3000
>> address@hidden                                   Boulder, CO 80307
>> ----------------------------------------------------------------------------
>> Unidata WWW Service              http://my.unidata.ucar.edu/content/support
>> ----------------------------------------------------------------------------
>> NOTE: All email exchanges with Unidata User Support are recorded in the
>> Unidata inquiry tracking system and then made publicly available
>> through the web.  If you do not want to have your interactions made
>> available in this way, you must let us know in each email you send to us.
>>
>
>
--
NOTE: All email exchanges with Unidata User Support are recorded in the
Unidata inquiry tracking system and then made publicly available
through the web.  If you do not want to have your interactions made
available in this way, you must let us know in each email you send to us.