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NOUS41 KWBC 181359
PNSWSH
TECHNICAL IMPLEMENTATION NOTICE 08-97 AMENDED
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
958 AM EDT WED MAR 18 2009
TO: SUBSCRIBERS:
-FAMILY OF SERVICES
-NOAA WEATHER WIRE SERVICE
-EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
OTHER NWS PARTNERS...AND NWS EMPLOYEES
FROM: KEVIN SCHRAB
CHIEF... OBSERVING SERVICES DIVISION
OFFICE OF CLIMATE WATER AND WEATHER SERVICES
SUBJECT: AMENDED 2009 SCHEDULE DATES FOR TERMINATION OF
RADIOTHEODOLITE TRACKING /ART/ AND RADIO
DIRECTION FINDING RADIOSONDES /RDF/ WITH
INSTALLATION OF RADIOSONDE REPLACEMENT
SYSTEMS /RRS/
AMENDED TO REMOVE ALBANY NEW YORK AND TO ADD KING SALMON
ALASKA.
TEN UPPER AIR /UA/ SITES ARE SCHEDULED TO RECEIVE RRS
UPGRADES IN THE THIRD AND FOURTH QUARTERS OF 2009. THE NEXT
TECHNICAL IMPLEMENTATION NOTICE /TIN/ WILL BE ISSUED IN
JUNE.
SID STATION NAME OUTAGE DATES
74494 CHATHAM MA 17 APR 2009
72632 WHITE LAKE MI 01 MAY 2009
72747 INTERNATIONAL FALLS MN 15 MAY 2009
72520 PITTBURGH PA 29 MAY 2009
72501 UPTON NY 12 JUN 2009
70326 KING SALMON AK 10 JUL 2009
70200 NOME AK 24 JUL 2009
70261 FAIRBANKS AK 07 AUG 2009
70361 YAKUTAT AK 21 AUG 2009
70398 ANNETTE AK 04 SEP 2009
EACH UPPER AIR SITE WILL BE OUT OF SERVICE FOR ABOUT 10
DAYS. WHEN NWS UA OBSERVATIONS RESUME THE RRS WILL BE
GATHERING METEOROLOGICAL DATA FROM GLOBAL POSITIONING
SYSTEM /GPS/ RADIOSONDES.
THE NWS DESCRIBES THE RRS RELEASE POINT LOCATION WITH THE
NATIONAL GEODETIC SURVEY /NGS/ OPUS SOLUTION. THIS IS A
DATUM COMBINATION THAT RELIES ON NORTH AMERICAN DATUM OF
1983 /NAD83/ FOR LATITUDE AND LONGITUDE WHEREAS THE RELEASE
POINT ELEVATION IS BASED ON NORTH AMERICAN VERTICAL DATUM
1988 /NAVD88/ WITH THE GEOID03 MODEL. BY CONTRAST THE GPS
RADIOSONDE FLIGHT INFORMATION OF LATITUDE AND LONGITUDE AND
ALTITUDE WILL RELY ON THE WORLD GEODETIC SYSTEM 1984
/WGS84/ STANDARD.
BE ADVISED PARTS OF THE UPPER AIR CODED MESSAGES WILL BE
SIGNIFICANTLY LONGER WITH RRS CONVERSION. NWS HAS
COORDINATED WITH ITS PARTNERS ON THE LONGER LENGTH OF THESE
MESSAGES.
THE FORMAT OF THE MESSAGES WILL BE THE SAME WMO FORMAT FOR
CODED UPPER AIR MESSAGES USED WITH THE MICROART LEGACY
SYSTEM. THE NUMBER OF LEVELS IN THE CODED MESSAGES WILL BE
TWO TO THREE TIMES GREATER FOR THE TTBB AND TTDD. AS A
RESULT TWO CATEGORIES OF AWIPS TEXT PRODUCTS WILL INCREASE
IN SIZE: SGL AND ABV. THE NUMBER OF LEVELS IN THE TTAA...
TTCC... PPBB AND PPDD PARTS WILL BE RELATIVELY UNCHANGED.
THESE CHANGES REFLECT UPDATED CODING PRACTICES AND HIGHER
RESOLUTION LEVEL SELECTION CRITERIA. THE MAXIMUM SIZE
LIMITS OF THE PARTS OF THE CODED MESSAGES ARE AS FOLLOWS:
TTAA: 15 LEVELS
TTCC: 10 LEVELS
TTBB: 135 LEVELS
TTDD: 40 LEVELS
PPBB: 40 LEVELS
PPDD: 40 LEVELS
IN ADDITION THE 31313 MESSAGE INDICATOR ASSOCIATED WITH
VARIOUS PARTS OF THE MESSAGE WILL BE INCLUDED WITH EACH
PART OF THE THERMODYNAMIC MESSAGE PARTS.
FOR ADDITIONAL INFORMATION ON THE MESSAGE REQUIREMENTS...
REFERENCE WMO 306: MANUAL ON CODES: INTERNATIONAL CODES:
VOLUME 1.1 PART A-ALPHANUMERIC CODES AND WMO 306: MANUAL ON
CODES: REGIONAL CODES AND NATIONAL CODING PRACTICES: VOLUME
II. USERS CAN FIND INFORMATION ON THE LEVELS SELECTION
CRITERIA USED IN NWS CODING SOFTWARE ONLINE AT
/USE LOWERCASE/:
HTTP://WWW.UA.NWS.NOAA.GOV
IF YOU HAVE QUESTIONS OR FEEDBACK...PLEASE CONTACT:
DOMINIC BOSCO
NATIONAL WEATHER SERVICE / OPS11
1325 EAST WEST HIGHWAY
SILVER SPRING MARYLAND 20910
301-713-1841 EXT. 123
DOMINIC.BOSCO@xxxxxxxx
NATIONAL TECHNICAL IMPLEMENTATION NOTICES ARE ONLINE AT
/USE LOWERCASE/:
HTTP://WWW.WEATHER.GOV/OS/NOTIF.HTM
$$