NOUS41 KWBC 081331



Public Information Statement, Comment Request

National Weather Service Headquarters Washington DC

131 PM EST Mon Nov 8 2010


To:        Subscribers:

           -Family of Services

           -NOAA Weather Wire Service

           -Emergency Managers Weather Information Network


           Other NWS Partners, Users and Employees


From:      John Ward

           Chief, Global Modeling Branch

           NCEP/Environmental Modeling Center


Subject:   Soliciting Public Comments through Dec 31, 2010

           on Modification of Product Dissemination Time of

           Global Ensemble Forecast System Products


The National Centers for Environmental Prediction (NCEP) is

proposing to upgrade the Global Ensemble Forecast System (GEFS)

in late 2011.  This upgrade would result in GEFS products being

distributed to the public up to 30 minutes later than the

current distribution time.  The NWS is seeking comments on this

proposed upgrade and resultant distribution schedule change by

December 31, 2010.


The proposed upgrades to the modeling system would be:


-Increased horizontal model resolution from T190 to T254 for

 forecast hours 0 to 192

-Increased vertical resolution from L28 to L42 for forecast

 hours 0 to 384

-Improved initial perturbations

-Improved stochastic total tendency perturbations


The benefits to the user community would be improved model



The delayed delivery time would affect all GEFS products

distributed through NOAAPORT, the NWS ftp server, the NCEP

ftp/http server, and NOMADS.  This GEFS upgrade might also

cause minor delays to the output of the GEFS Tracker Job, which

plots positions of cyclones, and the Global Ensemble Ocean Wave



More details about the GEFS are available at:


At the close of the public comment period, NWS will evaluate

the comments to determine whether to proceed with this upgrade

to the GEFS as planned. A Technical Information Notice will be

issued containing the implementation date and more details

about the upgrade and resultant product delays.


Please send comments on this proposal to:


LCDR Chad Cary

Executive Officer

NWS/NCEP Environmental Modeling Center

5200 Auth Road

Camp Springs, MD 20746

301-763-8000 x7704


National Public Information Statements are online at: