NOXX10KWBC 212108
DATA MGT MESSAGE 08-02.08
ATTN USERS OF PRODUCTS OR SERVICES
FROM THE NWS TELECOMMUNICATION GATEWAY OR RTH
WASHINGTON
SUBJECT: RESCHEDULED CHANGES TO THE HORIZONTAL AND VERTICAL
RESOLUTIONS OF THE NCEP GLOBAL FORECAST
SYSTEM...NOW EFFECTIVE OCT 29 2002 AT 1200 UTC
ON OCTOBER 29 2002 AT 1200 COORDINATED UNIVERSAL TIME /UTC/
THE NATIONAL CENTERS FOR ENVIRONMENTAL PREDICTION /NCEP/
WILL CHANGE THE HORIZONTAL AND VERTICAL RESOLUTIONS OF THE
ANALYSIS AND FORECAST SUITES IN ITS GLOBAL FORECAST SYSTEM
/GFS/. THE CHANGE IN RESOLUTION IS THE FINAL STEP IN A
CONSOLIDATION OF GLOBAL MODEL JOBS...WHICH PREVIOUSLY
INCLUDED ELIMINATION OF THE MEDIUM RANGE FORECAST /MRF/
RUN...ON APRIL 24 2002...AND THE GENERATION OF THE 4 PER
DAY GFS /FORMERLY KNOWN AS THE AVN/ RUNS OUT TO 16 DAYS...
ON MARCH 5 2002.
THE GFS WILL INCREASE ITS USE OF SATELLITE DATA...AND WILL
CHANGE ITS CURRENT T170...42-LAYER /T170L42/ RESOLUTION
TO T254L64... HORIZONTAL RESOLUTION CHANGES FROM 75 KM TO
55 KM...VERTICAL RESOLUTION CHANGES PRIMARILY IN THE
STRATOSPHERE...WITH MODEL TOP RAISED FROM 2 HPA to 0.2
HPA.
FORECAST MODEL SUITE...CURRENTLY T170L42 /0-180 HOURS/
AND T62L28 /180-384 HOURS/...WILL BECOME A DOWNWARD
CASCADE OF RESOLUTIONS FOR SHORT MEDIUM AND LONG RANGE
FORECASTS...T254L64 /0-84 HOURS/...T170L42 /84-180 HOURS/
AND T126L28 /180-384 HOURS/.
USERS CAN EXPECT TO SEE SLIGHT IMPROVEMENTS IN MOST
FORECASTS. THE TROPICS MAY BE SLIGHTLY MORE NOISY. MODEL
BIASES AND OTHER CHARACTERISTICS WILL REMAIN LARGELY
UNCHANGED. IT IS ANTICIPATED THAT THE HIGHER RESOLUTION
DURING THE FIRST 84 HOURS OF THE FORECAST WILL IMPROVE
MODELED DETAILS OF FRONTS...JET STREAMS...PRECIPITATION...
AND TROPICAL STORMS...WHILE THE HIGHER RESOLUTION BEYOND
180 HOURS WILL IMPROVE FORECASTS OF TRANSIENTS...THEREBY
IMPROVING PREDICTIONS OF REGIME CHANGES.
THE IMPACT OF THIS CHANGE ON THE NCEP PRODUCTION SCHEDULE
WILL BE AS FOLLOWS
GFS 120 HOUR PRODUCTS DELAYED 21 MINUTES
GFS 384 HOUR PRODUCTS DELAYED 21 MINUTES
GFDL HURRICANE MODEL DELAYED 25 MINUTES
WAVE MODEL PRODUCTS DELAYED 19 MINUTES
AVN MOS PRODUCTS DELAYED 21 MINUTES
1200 UTC GLOBAL ENSEMBLE PRODUCTS DELAYED 28 MINUTES
WHEN THE NEXT CENTRAL COMPUTER SYSTEM BECOMES OPERATIONAL BY THE
THIRD QUARTER /APRIL...MAY...AND JUNE/ OF FISCAL YEAR 2003...THE
NCEP PRODUCTION SCHEDULE WOULD RETURN TO ITS CURRENT
CONFIGURATION.
IF YOU HAVE ANY QUESTIONS ABOUT THESE CHANGES TO THE NCEP GLOBAL
FORECAST SYSTEM PLEASE CONTACT
HUA-LU PAN
PHONE: 301-763-8000 EXT. 7234
E-MAIL: address@hidden
OR
JOHN WARD
PHONE: 301-763-8000 EXT. 7185
E-MAIL: address@hidden
THIS AND OTHER NWS TECHNICAL IMPLEMENTATION NOTICES ARE AVAILABLE
ON THE INTERNET AT /USE LOWER CASE/:
http://www.nws.noaa.gov/om/notif.htm
THIS AND OTHER NWS TECHNICAL IMPLEMENTATION NOTICES
ARE AVAILABLE ON THE INTERNET AT /USE LOWER CASE/
HTTP/COLON///WWW.NWS.NOAA.GOV/OM/NOTIF.HTM
Listed below is directory/file and volume information
pertaining to the implementation of the GFS T254 on the
NWS FTP servers
SL.us008001/ST.opnl/MT.avn_CY.hh/RD.yyyymmdd/PT.grid_DF.gr1/
where hh = 00, 06, 12, & 18
fh.hhhh_t1.sflux
fh.hhhhi_t1.sflux
FYI.
The surface flux files /with the extension ".sflux"/ have
increased with this upgrade.
Files for forecast hours 0000 to 0180 are produce in 3 hour
increments.
Files for forecast hours 0192 to 0384 are produce in 12 hour
increments.
These files are available during four cycles (00, 06, 12, 18).
Volumes.
Current
New
fh.0000_t1.sflux to fh.0084_t1.sflux = 8 MB
17 MB
fh.0087_t1.sflux to fh.0180_t1.sflux = 8 MB
8 MB
fh.0192_t1.sflux to fh.0384_t1.sfux = 1.1 MB
4.5 MB
Current:
29 files x 8 MB = 232 MB (0000 - 0084, 3 hour increments =
29 files)
32 files x 8 MB = 256 MB (0087 - 0180, 3 hour increments
= 32 files)
17 files x 1.1 MB = 18.7 MB (0192 - 0384, 12 hour increments
= 17 files)
Current total file size/volume per cycle = 506.7 MB (232 + 256
+ 18.7 = 506.7 MB)
Current total file size/volume per day = 2.1 GB (506.7 x 4
cycles = 2.1 GB)
New:
29 files x 17 MB = 493 MB (0000 - 0084, 3 hour increments =
29 files)
32 files x 8 MB = 256 MB (0087 - 0180, 3 hour increments
= 32 files)
17 files x 4.5 MB = 76.5 MB (0192 - 0384, 12 hour increments
= 17 files)
New total file size/volume per cycle = 825.5 MB (493 + 256 +
76.5 = 825.5)
New total file size/volume per day = 3.3 GB ( 825.5 x 4
cycles = 3.3 GB)
In summary, 3.3 GB per day versus 2.1 GB per day.
FOR FOS/NOAAPORT AND NON-AWIPS CUSTOMERS - IF YOU HAVE
ANY QUESTIONS REGARDING THIS NOTICE... PLEASE CONTACT
DATA MANAGEMENT
LOWER CASE
EMAIL NWS.DM/AT SYMBOL/NOAA.GOV
THIS INFORMATION IS ALSO POSTED ON THE NWS DATA
MANAGEMENT CHANGE NOTICES WEB PAGE THE URL IS LISTED
BELOW
HTTP/COLON///WWW.NWS.NOAA.GOV/DATAMGMT/NOTICES.SHTML
DATA MANAGEMENT TELECOMMUNICATION OPERATIONS CENTER
RTH WASHINGTON SENDS
END
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