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-------- Original Message --------498 NOUS41 KWBC 091755
PNSWSH TECHNICAL IMPLEMENTATION NOTICE 09-29 NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC 155 PM EDT WED SEP 9 2009 TO: SUBSCRIBERS:-FAMILY OF SERVICES -NOAA WEATHER WIRE SERVICE
-EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
-NOAAPORT
OTHER NWS PARTNERS...USERS AND EMPLOYEES
FROM: JASON TUELL
SCIENCE PLANS BRANCH CHIEF
OFFICE OF SCIENCE AND TECHNOLOGY
SUBJECT: UPGRADE TO SHORT RANGE ENSEMBLE FORECAST SYSTEM:
EFFECTIVE OCTOBER 13 2009
THE INFORMATION IN THIS NOTICE IS BEING PROVIDED AS A COURTESY. THIS NOTICE IS OUTSIDE THE SCOPE OF NWS INSTRUCTION 10-1805.
ON OCTOBER 13 2009 AT 1500 COORDINATED UNIVERSAL TIME /UTC/ THE NATIONAL CENTERS FOR ENVIRONMENTAL PREDICTION /NCEP/ WILL UPGRADE THE SHORT RANGE ENSEMBLE FORECAST SYSTEM /SREF/
SREF MODELING SYSTEM CHANGES INCLUDE:-THREE OF THE FOUR MODELS USED IN THE SREF /NMM...ARW AND RSM/ WILL BE UPGRADED IN MODEL VERSION /NMM AND ARW FROM WRF V2.0 TO WRF V2.2...RSM FROM V2003 TO V2008/ AND INCREASED FROM 40/45KM TO 32/35KM IN HORIZONTAL RESOLUTION. THE UPGRADE AND INCREASED RESOLUTION SIGNIFICANTLY IMPROVE THE PERFORMANCE OF EACH INDIVIDUAL MEMBER...FOR EXAMPLE REDUCING THE TEMPERATURE BIAS FOR WRF MEMBERS AND ADDING MORE SPATIAL DETAIL. AS A RESULT...BETTER BEHAVED PROBABILITIES ARE ALSO ACHIEVED BY INCREASING FORECAST SHARPNESS FOR THE ENSEMBLE AS A WHOLE.
-INCREASE OF WRF MEMBERSHIP /NMM FROM 3 TO 5...ARW FROM 3 TO 5/ AND REDUCTION OF ETA MEMBERSHIP /FROM 10 TO 6...MEMBERS N3...N4...P3 AND P4 ARE REMOVED/
-MORE PHYSICS DIVERSITY BY SWITCHING FROM ZHAO CLOUD SCHEME TO FERRIER CLOUD SCHEME IN THREE OUT OF FIVE RSM MEMBERS.
-FORECAST OUTPUT /GRIB/ FREQUENCY WILL INCREASE FROM 3-HOURLY TO HOURLY FOR THE FIRST 39 HOURS.
-FOUR NEW AVIATION PRODUCTS WILL BE ADDED TO ENSEMBLE PRODUCTS /MEAN AND PROBABILITY/:
-ICING -CLEAR AIR TURBULANCE -CEILING -FLIGHT RESTRICTION-THREE NEW PRODUCTS WILL BE ADDED TO THE INDIVIDUAL MEMBER OUTPUT FOR SOME MEMBERS:
-PBL HEIGHT /RICHARDSON NUMBER =0.25/ -SIMULATED COMPOSITE REFLECTIVITY -ECHO TOP /=18.3DBZ/-EACH SREF MEMBER BUFR OUTPUT WILL BE BROKEN OUT INTO INDIVIDUAL STATION TIME SERIES.
A CONSISTENT PARALLEL FEED OF DATA WILL BECOME AVAILABLE ON THE NCEP FTP SERVER ONCE THE MODEL IS RUNNING IN PARALLEL ON THE NCEP CENTRAL COMPUTING SYSTEM SEPTEMBER 15 2009. AT THIS TIME THE PARALLEL DATA WILL BECOME AVAILABLE VIA THE FOLLOWING URL /USE LOWERCASE/:
FTP://FTP.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/SREF/PARATHE ENVIRONMENTAL MODELING CENTER /EMC/ MESOSCALE MODELING BRANCH /MMB/ HAS A PUBLIC WEBSITE PROVIDING USERS MORE INFORMATION CONCERNING THE SREF MODELING SYSTEM AS WELL AS OTHER NCEP REGIONAL MODELING SYSTEMS /USE LOWERCASE/:
HTTP://WWW.EMC.NCEP.NOAA.GOV/MMB/MESOSCALE.HTML DATA DELIVERY TIMING/VOLUME/CONTENT CHANGES: NOAAPORT DATA:-AT THE CURRENT TIME THE FOLLOWING DOMAINS ARE DISSEMINATED TO NOAAPORT/AWIPS USERS: CONUS...ALASKA...EASTERN PACIFIC.
-NO DATA CONTENT CHANGES ARE EXPECTED. -NO CHANGE IS EXPECTED IN THE CONTENT DELIVERY TIME. -NO SIGNIFICANT CHANGES IN DATA VOLUMES ARE EXPECTED.-NO CHANGE IN GRIDDED BINARY /GRIB/ PRODUCT DEFINITION SECTION CONTENT IS EXPECTED.
NWS FTP SERVER /USE LOWERCASE EXCEPT FOR SL...ST... MT... RD...AND...CY. WHERE THE HH REFERS TO THE CYCLE: 03...09...15...21 WHERE THE YYYYMMDD REFERS TO THE CURRENT DATE/:
FTP://TGFTP.NWS.NOAA.GOV/SL.US008001/ST.OPNL/MT.SREF_CY.HH/RD .YYYYMMDD-AT THE CURRENT TIME THE CONUS DOMAIN IS DISSEMINATED TO USERS.
-NO CHANGE IS EXPECTED IN THE CONTENT DELIVERY TIME.-THE FOUR FIELDS LISTED ABOVE WILL BE ADDED TO ENSEMBLE GRIB FILES. -A SMALL INCREASE IN DATA VOLUME CAN BE EXPECTED DUE TO THE NEW FIELDS. -NO CHANGE IN GRIB PRODUCT DEFINITION SECTION CONTENT IS EXPECTED FOR THE CURRENT DATA SETS WHICH ARE DELIVERED.
NCEP FTP SERVER: /USE LOWERCASE/ FTP://FTP.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/SREF/PROD-AT THE CURRENT TIME...THE FOLLOWING DOMAINS ARE DISSEMINATED: CONUS...ALASKA...EASTERN PACIFIC
-NO CHANGE IS EXPECTED IN THE CONTENT DELIVERY TIME.-NO CHANGE IN PRODUCT DEFINITION SECTION CONTENT IS EXPECTED FOR THE CURRENT DATA SETS WHICH ARE DELIVERED. -THE THREE FIELDS LISTED ABOVE WILL BE ADDED TO THE OUTPUT FILES FOR SOME OF THE INDIVIDUAL MEMBERS. -THE FOUR FIELDS LISTED ABOVE WILL BE ADDED TO ENSEMBLE GRIB FILES. -THE TEMPORAL RESOLUTION FOR THE CONUS DOMAIN OF THE INDIVIDUAL MEMBERS WILL INCREASE FROM 3-HOURLY TO HOURLY OUT TO 39 HOURS. -THE ADDITIONAL ELEMENTS AND INCREASED TEMPORAL RESOLUTION WILL RESULT IN A SIGNIFICANT INCREASE IN DATA VOLUME
-THERE WILL BE NO DIRECTORY STRUCTURE CHANGES.-THE NEW BUFR OUTPUT FOR INDIVIDUAL STATIONS WILL BE AVAILABLE. -MEMBERSHIP CHANGE IS EXPECTED: ETA/S N3...P3...N4...P4 MEMBERS WILL BE GONE. NMM N2...P2 AND EM N2...P2 MEMBERS WILL BE ADDED.
NCEP ENCOURAGES ALL USERS TO ENSURE THEIR DECODERS ARE FLEXIBLE AND ARE ABLE TO ADEQUATELY HANDLE
-CHANGES IN CONTENT -PARAMETER FIELDS CHANGING ORDER -CHANGES IN THE SCALING FACTOR COMPONENT WITHIN THE PRODUCT DEFINITION SECTION OF THE GRIB FILES-VOLUME CHANGES THESE ELEMENTS MAY CHANGE WITH FUTURE NCEP MODEL IMPLEMENTATIONS. NCEP WILL MAKE EVERY ATTEMPT TO ALERT USERS TO THESE CHANGES PRIOR TO IMPLEMENTATIONS.
FOR QUESTIONS REGARDING THE SCIENTIFIC CONTENT OF THE MODELING SYSTEM...PLEASE CONTACT:
GEOFF DIMEGO
NCEP/EMC
CAMP SPRINGS MARYLAND 20746
301-763-8000 X 7221
GEOFF.DIMEGO@xxxxxxxx
OR
JUN DU
NCEP/EMC
CAMP SPRINGS MARYLAND 20746
301-763-8000 X 7593
JUN.DU@xxxxxxxx
FOR QUESTIONS REGARDING THE DATAFLOW ASPECTS OF THESE DATA
SETS...PLEASE CONTACT:
REBECCA COSGROVE
NCEP/NCO DATAFLOW TEAM
CAMP SPRINGS MARYLAND 20746
301-763-8000 X 7198
NCEP.LIST.PMB-DATAFLOW@xxxxxxxx
NWS NATIONAL TECHNICAL IMPLEMENTATION NOTICES ARE ONLINE AT /USE LOWERCASE/:
HTTP://WWW.WEATHER.GOV/OS/NOTIF.HTM $$
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