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NOUS41 KWBC 171330
PNSWSH
SERVICE CHANGE NOTICE 08-55
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
930 AM EDT WED SEP 17 2008
TO: NATIONAL WEATHER SERVICE /NWS/ OFFICES
FEDERAL AVIATION ADMINISTRATION /FAA/ USERS
FAMILY OF SERVICES /FOS/ SUBSCRIBERS
OTHER USERS OF NWS AVIATION FORECASTS
FROM: KEVIN L. JOHNSTON
CHIEF...AVIATION SERVICES BRANCH
SUBJECT: REMINDER: FORMAT CHANGE FOR TERMINAL AERODROME FORECASTS
/TAFS/ FROM 24-HOUR FORMAT TO 30-HOUR FORMAT:
EFFECTIVE 0000 UTC NOVEMBER 5 2008
REFER TO: SCN 08-15... SCN 08-46... TIN 08-16... TIN 08-17... TIN
08-18... TIN 08-24... TIN 08-25... TIN 08-30...AND TIN 08-73
EFFECTIVE AT 0000 COORDINATED UNIVERSAL TIME /UTC/ NOVEMBER 5 2008
ALL TAFS ISSUED BY NWS WILL CHANGE THE DATE AND TIME INDICATOR
FORMAT IN THE TAF FROM THE PRESENT 24-HOUR FORMAT TO A NEW 30-HOUR
FORMAT CONSISTENT WITH NEW INTERNATIONAL CIVIL AVIATION
ORGANIZATION /ICAO/ RULES. THE EFFECTIVE TIME OF 0000 UTC WAS SET
BY ICAO AND COORDINATED THROUGHOUT ITS MEMBERSHIP.
THIS FORMAT CHANGE IS PART OF AN INTERNATIONAL EFFORT TO IMPLEMENT A CONSISTENT TAF FORMAT EVEN AS TAF VALID TIMES RANGE FROM A FEW HOURS UP TO AND INCLUDING 30 HOURS. ALL OF THE NEARLY 625 TAFS ISSUED BY NWS WILL BE AFFECTED BY THIS CHANGE. A TABLE LISTING ALL THE AFFECTED TAFS IS LOCATED AT /USE LOWER CASE/: HTTP://WWW.WEATHER.GOV/OS/AVIATION/PDFS/30_HR_TAF_TABLE1.PDF FEDERAL AVIATION ADMINISTRATION /FAA/ PERSONNEL AND OTHER EXTERNAL USERS RECEIVING NWS TAFS IN THE TAF COLLECTIVES BELOW WILL ALSO NEED TO TAKE ACTION TO ENSURE CONTINUED ABILITY TO DECODE TAFS. WMO HEADINGS AVAILABLE TO THE FOLLOWING CUSTOMERSFTUS80 KWBC NON-FAA DOMESTIC AND FAMILY OF SERVICES
FTUS90 KWBC FAA WEATHER MESSAGE SWITCHING CENTER
AND FAA FACILITIES
FTUS52 KWBC GLOBAL TELECOMMUNICATION SYSTEM CUSTOMERS
TEST TAFS WILL BE PROVIDED FOR USERS TO CHECK AND EVALUATE THEIR
ABILITY TO DECODE THE NEW DATE AND TIME FORMAT. THESE TESTS WILL
BE OCCURRING AT LEAST ONCE A WEEK THROUGH SEPTEMBER AND OCTOBER.
TIN 08-73 DETAILS THE TEST STRUCTURE AND METHOD. A TAF TESTBED
CAN BE FOUND AT /USE LOWER CASE/: HTTP://WWW.WEATHER.GOV/OS/AVIATION/TAF_TESTBED.HTMIN ADDITION...TAFS FOR 32 LARGE AIRPORTS WILL BECOME VALID FOR 30 HOURS. THE SPECIFIC AIRPORTS AND TAFS SCHEDULED TO HAVE
EXTENDED VALID TIMES WERE ANNOUNCED IN SEPARATE NOTICES. SEE TINS 08-16... 08-17... 08-18... 08-24... 08-25...AND 08-30. THESECHANGES WILL TAKE EFFECT AT 0000 UTC.
NATIONAL GUIDELINES REGARDING THE TAF WILL BE INCLUDED AS PART OF A FUTURE UPDATE OF NWS INSTRUCTION /NWSI/ 10-813 TERMINAL AERODROME FORECASTS AT /USE LOWER CASE/: HTTP://WWW.NWS.NOAA.GOV/DIRECTIVES/SYM/PD01008013CURR.PDF GUIDANCE TO NWS FORECASTERS FOR EDITING THE NEW TAF FORMAT WILL BE PROVIDED AT /USE LOWER CASE LETTERS/: HTTP://AVIATIONWEATHER.GOV/NOTICE/TAF30.PHP REPEATING: THIS CHANGE IS EFFECTIVE AT 0000 UTC NOVEMBER 52008...AND WILL AFFECT ALL TAFS PRODUCED BY NWS.
FOR QUESTIONS REGARDING THIS SERVICE CHANGE NOTICE PLEASE CONTACT: BETH MCNULTY NATIONAL WEATHER SERVICE AVIATION SERVICES BRANCH 1325 EAST WEST HIGHWAY SILVER SPRING MD 20910 301-713-1726 EXT 116 BETH.MCNULTY@xxxxxxxx NWS SERVICE CHANGE NOTICES ARE ONLINE AT /USE LOWER CASE/: HTTP://WWW.WEATHER.GOV/OS/NOTIF.HTM $$ NNNN -
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