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-------- Original Message --------864 NOUS41 KWBC 101127
PNSWSHTECHNICAL IMPLEMENTATION NOTICE 09-22 NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
727 AM EDT FRI JUN 10 2009TO: 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 2009EACH 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 20910301-713-1841 EXT. 123 DOMINIC.BOSCO@xxxxxxxx
NATIONAL TECHNICAL IMPLEMENTATION NOTICES ARE ONLINE AT /USE LOWERCASE/:
HTTP://WWW.WEATHER.GOV/OS/NOTIF.HTM $$ NNNN
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