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NOUS41 KWBC 101127
PNSWSH
TECHNICAL IMPLEMENTATION NOTICE 09-22
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
727 AM EDT FRI JUN 10 2009
TO: SUBSCRIBERS:
-FAMILY OF SERVICES
-NOAA WEATHER WIRE SERVICE
-EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
-NOAAPORT
OTHER NWS PARTNERS...AND NWS EMPLOYEES
FROM: KEVIN SCHRAB
CHIEF... OBSERVING SERVICES DIVISION
OFFICE OF CLIMATE WATER AND WEATHER SERVICES
SUBJECT: FOURTH QUARTER FY09 SCHEDULE DATES FOR TERMINATION
OF AUTOMATED RADIOTHEODOLITE TRACKING /ART/ AND RADIO
DIRECTION FINDING RADIOSONDES /RDF/ WITH INSTALLATION
OF RADIOSONDE REPLACEMENT SYSTEMS /RRS/
FIVE SITES IN ALASKA ARE SCHEDULED TO RECEIVE RRS UPGRADES IN
FOURTH QUARTER 2009. EXPECT A 10 DAY OUTAGE OF UPPER-AIR
OBSERVATIONS AT EACH SITE BEGINNING ON THE DATES LISTED BELOW.
SID STATION NAME OUTAGE DATES
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 THE GEOCENTRIC INTERNATIONAL
TERRESTRIAL REFERENCE FRAME (ITRF00) FOR LATITUDE AND LONGITUDE.
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.
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
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