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NOUS40 KWBC 081358
FOS/NOAAPORT NOTICE NO. 1834 DECEMBER 8... 2000
ATTENTION FAMILY OF SERVICES SUBSCRIBERS/NOAAPORT USERS
THE NOTIFICATION BELOW IS AN EXTRACT FROM A WMO METNO
MESSAGE
NOTIFICATION REMINDER FOR PASSAGE TO YEAR 2001
THE ATTENTION OF MEMBERS IS DRAWN TO THE FOLLOWING
REGULATIONS IN FM 92 GRIB AND FM 94 BUFR
IN FM 92 GRIB... UNDER SECTION 1 - PRODUCT DEFINITION SECTION
NOTE /6/ TO SPECIFY YEAR 2000...OCTET 13 OF THE SECTION /YEAR
OF THE CENTURY/ SHALL CONTAIN A VALUE EQUAL TO 100 AND
OCTET 25 OF THE SECTION /CENTURY OF REFERENCE TIME DATA/
SHALL CONTAIN A VALUE EQUAL TO 20. TO SPECIFY YEAR 2001...
OCTET 13 OF THE SECTION SHALL CONTAIN A VALUE EQUAL TO 1
AND OCTET 25 OF THE SECTION SHALL CONTAIN A VALUE EQUAL
TO 21 /BY INTERNATIONAL CONVENTION... THE DATE OF
1 JANUARY 2000 IS THE FIRST DAY OF THE HUNDREDTH YEAR OF
THE TWENTIETH CENTURY AND THE DATE OF 1 JANUARY 2001 IS
THE FIRST DAY OF THE FIRST YEAR OF THE TWENTY FIRST
CENTURY/ IT IS TO BE NOTED ALSO THAT YEAR 2000 IS A LEAP
YEAR AND THAT 29 FEBRUARY 2000 EXISTS.
IN FM 94 BUFR... UNDER SECTION 1 - IDENTIFICATION SECTION
NOTE /3/ TO SPECIFY YEAR 2000...OCTET 13 OF THE SECTION /YEAR
OF THE CENTURY/ SHALL CONTAIN A VALUE EQUAL TO 100. TO
SPECIFY YEAR 2001... OCTET 13 OF THE SECTION SHALL CONTAIN
A VALUE EQUAL TO 1 /BY INTERNATIONAL CONVENTION... THE
DATE OF 1 JANUARY 2000 IS THE FIRST DAY OF THE HUNDREDTH
YEAR OF THE TWENTIETH CENTURY AND THE DATE OF
1 JANUARY 2001 IS THE FIRST DAY OF THE FIRST YEAR OF THE
TWENTY FIRST CENTURY/ IT IS TO BE NOTED ALSO THAT YEAR
2000 IS A LEAP YEAR AND THAT 29 FEBRUARY 2000 EXISTS.
IN GRIB AND BUFR... THE CENTURY AND YEAR ARE CODED AS
FOLLOWED
YEAR GRIB CENTURY ID BUFR AND GRIB YEAR ID
1998 20 98
1999 20 99
2000 20 100
2001 21 1
2002 21 2
SO AT 00 UTC ON 1ST JANUARY 2001... THE GRIB CENTURY WILL
CHANGE FROM 20 TO 21... AND THE GRIB AND BUFR YEAR WILL
CHANGE FROM 100 TO 1. /
THIS INFORMATION IS ALSO POSTED ON THE NWS SYSTEMS
OPERATIONS CENTER CHANGE NOTICES WEB PAGE. THE URL IS
LISTED BELOW.
HTTP/COLON///WWW.NWS.NOAA.GOV/OSO/NOTICES/NOTICES.SHTML
/LOWER CASE/
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