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20041207: GFS resolutions for CONDUIT f000-f084

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  • Subject: 20041207: GFS resolutions for CONDUIT f000-f084
  • Date: 07 Dec 2004 11:48:42 -0700
Kevin,


On Tue, 2004-12-07 at 11:09, Kevin R. Tyle wrote:
> To clarify, will we continue to get 1-degree fields for hours
> 0 through 84?  Or will it be 0.5 only for 0-84, then 1 degree,
> and then 2.5 for week 2?
> 

The 1 degree will continue for F000 through f180 hours at the present
time. Currently the top T254 resolution of GFS only extends through 84
hours, so that is the extent to which NWS is producing the .5 degree
grids. If/when the GFS increases resolution in Q3 2005, the 
.5 degree grids may be available through 180 hours.

Since the .5 degree grids introduce a new format for many users,
I've cautioned to keep the GRIB1 1 degree grids on CONDUIT for f000-f084
for the time being, unless the recipients of CONDUIT indicate the added
volume is a problem. Discussion on this topic is certainly useful.


> Keeping 1-degree would be nice if only to avoid the need to use
> three different GEMPAK grids.  Is there a quick way to "degrade"
> resolution so the .5 degree fields could be written to a 1-degree file?

At present, dcgrib2 decodes and stores the full resolution. The ndfdg2 
program in GEMPAK does provide a GSKIP factor for the NDFD grids to 
decimate the resolution, which I plan on implementing in dcgrib2 for the
next release.


Steve Chiswell
Unidata User Support

> 
> ______________________________________________________________________
> Kevin Tyle, Systems Administrator               **********************
> Dept. of Earth & Atmospheric Sciences           address@hidden
> University at Albany, ES-235                    518-442-4578 (voice)
> 1400 Washington Avenue                          518-442-5825 (fax)
> Albany, NY 12222                                **********************
> ______________________________________________________________________
> 
> On Tue, 7 Dec 2004, Steve Chiswell wrote:
> 
> > Jerry,
> >
> > I see the 1 degree f120->> arriving now. It may have been
> > held up by the initial problem repored by NWS.
> >
> > The log messages Paula was referring to were status messages from the
> > grib2 insertion process providing verbose logging, and would be
> > unrelated.
> >
> > Thanks!
> >
> > Steve Chiswell
> > Unidata User Support
> >
> >
> >
> > On Tue, 2004-12-07 at 10:56, Jerrold Robaidek wrote:
> > > Hi,
> > >
> > >   The last GFS 1-degree grib was a Forecast hour 117, and came in at 
> > > 16:54 ....
> > >
> > > Did the rest get affected by the .5 degree data?
> > >
> > > Can we expect the rest to come in?  Could this be related to the errors 
> > > Paula was seeing?
> > >
> > > Thanks,
> > >
> > > Jerry
> >