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709
NOUS41 KWBC 141712
PNSWSH
TECHNICAL IMPLEMENTATION NOTICE 04-25
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
110 PM EDT MON JUN 14 2004
TO: NATIONAL WEATHER SERVICE /NWS/ OFFICES
FEDERAL AVIATION ADMINISTRATION /FAA/
FAMILY OF SERVICES /FOS/ SUBSCRIBERS
OTHER CUSTOMERS OF NWS AVIATION FORECASTS
FROM: MARK ANDREWS
CHIEF...AVIATION SERVICES BRANCH
SUBJECT: MODIFICATION OF GRAPHICAL TURBULENCE GUIDANCE
PRODUCT...EFFECTIVE AUGUST 25 2004
NOTE - THE FOLLOWING CHANGES HAVE NO IMPACT ON NOAA WEATHER WIRE
SERVICE SUBSCRIBERS
EFFECTIVE AUGUST 25 2004 AT 1300 COORDINATED UNIVERSAL TIME /UTC/
THE NATIONAL WEATHER SERVICE /NWS/ AVIATION WEATHER CENTER /AWC/
IN KANSAS CITY MISSOURI WILL INTRODUCE A COMPOSITE GRIB PRODUCT
AND DATA PRECISION ENHANCEMENT TO THE GRAPHICAL TURBULENCE
GUIDANCE /GTG/ PRODUCT.
THE GTG IS AN AUTOMATICALLY GENERATED TURBULENCE PRODUCT THAT
PREDICTS THE LOCATION AND INTENSITY OF TURBULENCE OVER THE
CONTINENTAL UNITED STATES /CONUS/. THE GTG PRODUCES AN ANALYSIS
GRIB OUTPUT EVERY HOUR AND FORECAST HOURS H+03...H+06...H+09 AND
H+12 EVERY THREE HOURS.
A COMPOSITE GRIB FILE FOR THE GTG WILL BECOME AVAILABLE ON AUGUST
25...2004. THE COMPOSITE DATA WILL CONSIST OF THE MAXIMUM
TURBULENCE VALUES AT EACH GRID COLUMN BETWEEN 20000 AND 45000
FEET.
THE DATA PRECISION ENHANCEMENT WILL INCREASE THE PRECISION OF THE
GTG GRIB OUTPUT FROM ONE DECIMAL PLACE TO THREE DECIMAL PLACES.
THE GTG HAS BEEN AVAILABLE AS AN OPERATIONAL PRODUCT SINCE MARCH
2003.
MORE INFORMATION ABOUT THE GTG PRODUCT CAN BE OBTAINED AT /USE
LOWER CASE LETTERS/:
HTTP://AVIATIONWEATHER.GOV/EXP/GTG/INFO.SHTML
THE CURRENT PRODUCT DESCRIPTION DOCUMENT FOR THE GTG IS AVAILABLE
AT /USE LOWER CASE LETTERS/:
HTTP://PRODUCTS.WEATHER.GOV/
TABLE 1: GTG HEADERS:
FLIGHT GTG WMO HEADING(S)
LEVEL
----- ---------------
200 YVW*46 KKCI
210 YVW*45 KKCI
220 YVW*43 KKCI
230 YVW*41 KKCI
240 YVW*39 KKCI
250 YVW*38 KKCI
260 YVW*36 KKCI
270 YVW*34 KKCI
280 YVW*33 KKCI
290 YVW*32 KKCI
300 YVW*30 KKCI
310 YVW*29 KKCI
320 YVW*27 KKCI
330 YVW*26 KKCI
340 YVW*25 KKCI
350 YVW*24 KKCI
360 YVW*23 KKCI
370 YVW*22 KKCI
380 YVW*21 KKCI
390 YVW*20 KKCI
400 YVW*19 KKCI
410 YVW*18 KKCI
420 YVW*17 KKCI
430 YVW*16 KKCI
440 YVW*15 KKCI
450 YVW*14 KKCI
WHERE * = A= 00 HOUR ANALYSIS
* = D= 03 HOUR FORECAST
* = G= 06 HOUR FORECAST
* = J= 09 HOUR FORECAST
* = M= 12 HOUR FORECAST
TABLE 2: GTG COMPOSITE HEADERS:
GTG COMPOSITE
TIME WMO HEADING(S)
---- --------------
00 HOUR ZVWA50 KKCI
03 HOUR FORECAST ZVWD50 KKCI
06 HOUR FORECAST ZVWG50 KKCI
09 HOUR FORECAST ZVWJ50 KKCI
12 HOUR FORECAST ZVWM50 KKCI
ON AUGUST 25 2004...THE GTG PRODUCT WILL CONTINUE TO BE AVAILABLE
IN GRIB FORMAT THROUGH:
1. THE SATELLITE BROADCAST NETWORK /SBN/ NOAAPORT CHANNEL
2. NATIONAL WEATHER SERVICE FTP SERVERS AT /USE LOWER CASE
LETTERS EXCEPT AS NOTED BELOW/:
FTP://TGFTP.NWS.NOAA.GOV/SL.US008001/DC.AVSPT/
NOTE: THE SL AND DC IN THE ABOVE INTERNET ADDRESS MUST BE IN
CAPITAL LETTERS.
3. THE FAMILY OF SERVICES /FOS/ HIGH RESOLUTION DATA SERVICE AND
SERVER ACCESS SERVICE.
ADDITIONAL INFORMATION ON NWS AVIATION PRODUCT DISSEMINATION IS
AVAILABLE AT /USE LOWER CASE LETTERS/:
HTTP://WEATHER.GOV/OS/DISEMSYS.SHTML
IF YOU HAVE ANY QUESTIONS REGARDING THIS PRODUCT...CONTACT:
CLINTON WALLACE
CHIEF, AVIATION SUPPORT BRANCH - AVIATION WEATHER CENTER
7220 NW 101ST TERRACE
ROOM 101
KANSAS CITY MO 64153
PHONE: 816-584-72048
E-MAIL: CLINTON.WALLACE@xxxxxxxx
THIS AND OTHER NWS TECHNICAL IMPLEMENTATION NOTICES ARE AVAILABLE
ONLINE AT /USE LOWER CASE LETTERS/
HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM
$$
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