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

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  • Subject: Re: [conduit] [ldm-users] GFS change at 1200 UTC 25 September?
  • Date: Mon, 01 Oct 2007 11:18:48 -0600
Harry,

I did notice the following paragraph in an ADMIN notice which makes it
sound
like the high relosution noise is being looked in to.

Steve Chiswell
Unidata User Support

489 
NOUS42 KWNO 291318
ADMNFD
 
SENIOR DUTY METEOROLOGIST NWS ADMINISTRATIVE MESSAGE
NWS NCEP CENTRAL OPERATIONS CAMP SPRINGS MD
0920 AM EDT SAT SEP 29 2007

THE 12Z NCEP MODEL PRODUCTION CYCLE STARTED ON TIME.

12Z RAOB RECAP..

DRA/72387 - UNAVAILABLE ON WEEKENDS
CUU/76225 - 10158..FLIGHT EQUIP PROBLEMS
MZT/76458 - 10159
MID/76644 - 10159
GUM/91212 - 10142..GROUND EQUIP PROBLEMS
RIW/72672 - NOT AVAILABLE FOR THE NAM
PASY/70414 - NOT AVAILABLE FOR THE NAM
YAH/71823 - MISSING PART B


A CRITICAL WEATHER DAY IS NOT EXPECTED IN THE NEXT 3 DAYS.


NCEP/NCO AND EMC ARE TESTING CHANGES FOR THE GFS MODEL WHICH
ARE AIMED AT RESOLVING SOME CONCERNS WITH MSLP FIELDS AND
SMOOTHING THE CONTOURS OF SOME HIGH RESOLUTION GRAPHICS.
TESTING OF THE CHANGES WILL CONTINUE THROUGH THE WEEKEND AND MAYBE
INTO EARLY NEXT WEEK.   


etc.....


On Fri, 2007-09-28 at 12:54 -0700, Harry Edmon wrote:
> Are there people at NCEP on the conduit and/or ldm-users mailing lists?  
> Are they seeing this traffic, or should we contact them directly?
> 
> Steve Chiswell wrote:
> > 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           address@hidden
> >> 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
> >>>>> address@hidden
> >>>>> For list information or to unsubscribe, visit: 
> >>>>> http://www.unidata.ucar.edu/mailing_lists/
> >>>>>           
> >>>> --
> >>>> Steve Chiswell <address@hidden>
> >>>> Unidata
> >>>> _______________________________________________
> >>>> ldm-users mailing list
> >>>> address@hidden
> >>>> For list information or to unsubscribe,  visit: 
> >>>> http://www.unidata.ucar.edu/mailing_lists/
> >>>>
> >>>>         
> >>> _______________________________________________
> >>> ldm-users mailing list
> >>> address@hidden
> >>> For list information or to unsubscribe,  visit: 
> >>> http://www.unidata.ucar.edu/mailing_lists/
> >>>
> >>>       
> >> _______________________________________________
> >> conduit mailing list
> >> address@hidden
> >> For list information or to unsubscribe, visit: 
> >> http://www.unidata.ucar.edu/mailing_lists/ 
> >>     
-- 
Steve Chiswell <address@hidden>
Unidata