Re: [ldm-users] [conduit] GFS change at 1200 UTC 25 September?

Kevin,

I don't think this issue is particular to the global 0.5 degree grids. 
I compared the 500mb plot that you showed with the GRID 212 (40km)
CONUS data from NOAAPORT as well, and that data looks to have the same
noisy
features. Both are GRIB2, and somewhat comparable grid spacing, so the
display appears consistently unattractive in that regard.

Steve Chiswell
Unidata User Support


On Fri, 2007-09-28 at 19:33 +0000, Kevin R. Tyle wrote:
> As for the 2nd paragraph below, that might still be the case, since the 
> 0.5 degree fields are not sent (as far as I know) over NOAAPORT and/or the 
> SBN--they are just posted on the ftp servers (and by extension, the 
> CONDUIT feed).
> 
> FWIW, the 1 degree fields (which I don't think are sent over NOAAPORT, at 
> least not on the NWSTG1 channel)  do not look different than pre-9/25, at 
> least at first glance.
> 
> ______________________________________________________________________
> Kevin Tyle, Systems Administrator               **********************
> Dept. of Earth & Atmospheric Sciences           ktyle@xxxxxxxxxxxxxxxx
> University at Albany, ES-235                    518-442-4578 (voice)
> 1400 Washington Avenue                          518-442-5825 (fax)
> Albany, NY 12222                                **********************
> ______________________________________________________________________
> 
> On Fri, 28 Sep 2007, David Knight wrote:
> 
> > But that notice
> >
> > http://www.nws.noaa.gov/om/notification/tin07-59gfs_upgrade_unifiedpost.txt
> >
> > says:
> >
> > "THE PRIMARY IMPACT TO CUSTOMERS RECEIVING THE GFS WILL BE THAT
> > THE DEFAULT PRECIPITATION TYPE ALGORITHM WILL CHANGE"
> >
> > and further
> >
> > "THE PRODUCTS/GRIDS WHICH ARE DISSEMINATED TO NOAAPORT AND/OR THE
> > SATELLITE BROADCAST NETWORK /SBN/ WILL NOT BE CHANGED IN VOLUME
> > OR CONTENT."
> >
> > So there appears to be more to this than that . . .
> >
> > David
> >
> >
> > "> Harry,
> >>
> >> NCEP posted a notice regarding change in the GFS postprocessor
> >> coincident
> >> with the 12Z Sep 25 run:
> >>
> >> http://www.nws.noaa.gov/om/notification/tin07-59gfs_upgrade_unifiedpost.txt
> >>
> >>
> >> Steve Chiswell
> >> Unidata User Support
> >>
> >>
> >> On Fri, 2007-09-28 at 10:01 -0700, Harry Edmon wrote:
> >>> I have had a couple of users complain about changes in the GFS data
> >>> starting with the 1200 UTC run on 25 September.  I notice there is a
> >>> jump up in the size of the gempak files starting with that run.  Does
> >>> anyone know of any changes?  If you are curious about what I am talking
> >>> about, look at this page, which uses the 0.5 degree data:
> >>>
> >>> http://www.atmos.washington.edu/~hakim/loop.psp?url=~hakim/tropo/theta/
> >>>
> >>> Start the loop and look at the areas in white go from smooth to noisy
> >>> with the 1200 UTC 25th run.  Another user is now having problems with
> >>> his WRF initialization that he did not have before this.
> >>>
> >>>
> >>> _______________________________________________
> >>> conduit mailing list
> >>> conduit@xxxxxxxxxxxxxxxx
> >>> For list information or to unsubscribe, visit: 
> >>> http://www.unidata.ucar.edu/mailing_lists/
> >> --
> >> Steve Chiswell <chiz@xxxxxxxxxxxxxxxx>
> >> Unidata
> >> _______________________________________________
> >> ldm-users mailing list
> >> ldm-users@xxxxxxxxxxxxxxxx
> >> For list information or to unsubscribe,  visit: 
> >> http://www.unidata.ucar.edu/mailing_lists/
> >>
> >
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> _______________________________________________
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-- 
Steve Chiswell <chiz@xxxxxxxxxxxxxxxx>
Unidata


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