NOUS41 KWBC 091745
PNSWSH

TECHNICAL IMPLEMENTATION NOTICE 06-39
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
146 PM EDT FRI JUN 9 2006

TO:        FAMILY OF SERVICES /FOS/ SUBSCRIBERS...NOAA 
           WEATHER WIRE SERVICE /NWWS/ SUBSCRIBERS... 
           EMERGENCY MANAGERS WEATHER INFORMATION NETWORK 
           /EMWIN/ SUBSCRIBERS...NOAAPORT SUBSCRIBERS...
           OTHER NATIONAL WEATHER SERVICE /NWS/ CUSTOMERS   
           AND PARTNERS...AND NWS EMPLOYEES

FROM:      GLENN AUSTIN
           DIGITAL SERVICES TRANSITION MANAGER
           OFFICE OF CLIMATE WATER AND WEATHER SERVICES

SUBJECT:   NWS NATIONAL DIGITAL FORECAST DATABASE /NDFD/
           ELEMENT FILES TO BE SPLIT INTO SMALLER FILES ON 
           SEPTEMBER 6 2006 /SEPTEMBER 7 LOCAL GUAM TIME/

REFER TO:  TECHNICAL IMPLEMENTATION NOTICE /TIN/ 06-30...
           SENT ON MAY 9 2006...SIMILAR SUBJECT REGARDING 
           THE SAME IMPLEMENTATION
                   AND
           TIN 06-37...SENT ON JUNE 5 2006...ANNOUNCING NEW 
           EXPERIMENTAL NDFD TROPICAL CYCLONE SURFACE WIND 
           SPEED PROBABILITY ELEMENTS FOR THE CONUS AND 
           ADJACENT COASTAL AREAS EFFECTIVE JULY 5 2006

THIS IS A FOLLOW-UP TO TIN 06-30 TO PROVIDE TECHNICAL DETAILS 
OF THE NDFD CHANGE BEING IMPLEMENTED ON SEPTEMBER 6 2006.

STARTING ON WEDNESDAY SEPTEMBER 6 2006 AT 1400 COORDINATED 
UNIVERSAL TIME /UTC/ OR MIDNIGHT LOCAL SEPTEMBER 7 LOCAL GUAM 
TIME...ALL NDFD ELEMENT FILES FOR ALL DOMAINS WILL BE SPLIT INTO 
SMALLER FILES COVERING DAYS 1 THROUGH 3 AND SEPARATE FILES 
COVERING DAYS 4 THROUGH 7. OPERATIONAL AND EXPERIMENTAL NDFD 
ELEMENTS FOR ALL DOMAINS WILL BE AFFECTED BY THIS CHANGE.

ANY EXCEPTIONS OR MODIFICATIONS TO THIS IMPLEMENTATION WILL BE 
ANNOUNCED IN AN UPDATED TECHNICAL IMPLEMENTATION NOTICE.  NO 
EXCEPTIONS ARE ANTICIPATED AT THIS TIME.

NEW EXPERIMENTAL AND OPERATIONAL ELEMENTS ADDED TO THE NDFD 
AFTER SEPTEMBER 6 2006 WILL BE IMPLEMENTED IN THIS SAME SPLIT 
FILE CONFIGURATION.  THIS INCLUDES THE NEW TROPICAL CYCLONE 
SURFACE WIND SPEED PROBABILITY ELEMENTS FOR THE CONUS AND THE 
ADJACENT COASTAL AREAS...WHICH WILL BE ADDED TO NDFD AS 
EXPERIMENTAL ELEMENTS ON JULY 5 2006.  FOR MORE INFORMATION ON 
THESE NEW EXPERIMENTAL ELEMENTS...REFER TO TIN 06-37.

ALSO...ON OR BEFORE SEPTEMBER 6 2006...ALL NDFD ELEMENTS WHICH 
EXTEND TO DAYS 4 THROUGH 7 WILL ONLY BE UPDATED 4 TIMES PER DAY 
AT 0000 UTC...0600 UTC...1200 UTC...AND 1800 UTC. BEGINNING THAT 
DAY...THERE WILL BE NO NEED OR ADVANTAGE TO ACCESS THE NDFD 
ELEMENTS FOR DAYS 4 THROUGH 7 MORE FREQUENTLY THAN EVERY 6 
HOURS.

SPECIFIC INFORMATION ABOUT IMPACTS OF THIS CHANGE FOR FTP 
USERS...GRAPHICS USERS...AND XML USERS AND BENEFITS OF THIS 
CHANGE ARE AVAILABLE AT /USE LOWER CASE LETTERS/:

	HTTP://WWW.WEATHER.GOV/NDFD/OPER_IMPLEM.HTM

THIS IMPLEMENTATION DOES NOT INCLUDE ANY OTHER MODIFICATIONS TO 
THE NDFD.  THE FORMAT OF THE NDFD ELEMENT FILES REMAINS THE 
SAME...AS DO THE SPATIAL AND TEMPORAL RESOLUTION OF THE DATA.

IF THE IMPLEMENTATION DAY IS A CRITICAL WEATHER DAY...IT MAY BE 
POSTPONED. IN THAT CASE USERS WILL BE NOTIFIED OF THAT DECISION 
AS FAR IN ADVANCE AS POSSIBLE.

IF YOU HAVE TECHNICAL QUESTIONS REGARDING THE DATA IN NDFD... 
PLEASE CONTACT:

     DAVID RUTH
     CHIEF...MESOSCALE PREDICTION BRANCH
     NATIONAL WEATHER SERVICE
     OFFICE OF SCIENCE AND TECHNOLOGY
     1325 EAST WEST HIGHWAY
     SILVER SPRING MARYLAND 20910
     EMAIL:  DAVID.RUTH@NOAA.GOV

IF YOU HAVE QUESTIONS REGARDING THIS NOTICE...PLEASE CONTACT:

     CHRIS ALEX
     DIGITAL SERVICES
     NATIONAL WEATHER SERVICE
     OFFICE OF CLIMATE...WATER...AND WEATHER SERVICES
     1325 EAST WEST HIGHWAY
     SILVER SPRING MARYLAND 20910
     EMAIL:  CHRISTINE.ALEX@NOAA.GOV

THIS AND ALL OTHER NWS TECHNICAL IMPLEMENTATION NOTICES ARE 
POSTED AT /USE LOWER CASE LETTERS/:

     HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM

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