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-------- Original Message --------304 NOUS41 KWBC 081425
PNSWSH TECHNICAL IMPLEMENTATION NOTICE 08-09 NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC925 AM EST FRI FEB 8 2008
TO: SUBSCRIBERS:
-FAMILY OF SERVICES
-NOAA WEATHER WIRE SERVICE
-EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
OTHER NWS PARTNERS...USERS AND EMPLOYEES
FROM: FIONA M. HORSFALL
ACTING CHIEF...CLIMATE SERVICES DIVISION
SUBJECT: NOAA UPDATES ITS LONG-TERM STATION EXTREMES OF DAILY
TEMPERATURE AND PRECIPITATION FOR DATA THROUGH 2007:
EFFECTIVE DECEMBER 31 2007
EFFECTIVE DECEMBER 31 2007 LONG-TERM STATION EXTREMES OF DAILY
TEMPERATURE AND PRECIPITATION FOR APROXIMATELY 268 KEY U.S.
WEATHER STATIONS WERE UPDATED FOR DATA THROUGH 2007. TO PROVIDE
THE LONGEST POSSIBLE PERIOD OF RECORD AT EACH STATION TO
DETERMINE EXTREMES...A PROJECT CALLED THREADEX /FOR THREADED
EXTREMES/ PIECES OR THREADS STATION DATA TOGETHER TO FORM A
SINGLE...LONG-TERM SET OF DAILY DATA. THE THREADEX PROJECT IS
OUTLINED AT: /USE LOWER CASE/
HTTP://THREADEX.RCC-ACIS.ORG/ NOAA HAS BUILT THREADS FOR THE APROXIMATELY 268 LOCATIONS THAT ARE PUBLISHED IN THE NCDC LOCAL CLIMATOLOGICAL DATA /LCD/. THE EXTREMES DERIVED FROM THE THREADS ARE USED IN THE NWS DAILY CLIMATE REPORTS /CLI/. THREADEX ADDRESSES THE ISSUE OF FRAGMENTED WEATHER DATA OVER TIME DUE TO STATION RELOCATIONS...WHICH HAVE HISTORICALLY INCLUDED INSTRUMENTATION MOVES FROM CITY LOCATIONS TO AIRPORTS ...AND MOVES AT AIRPORTS DUE TO EXPANSIONS. OBTAINING A LONG TIME SERIES /I.E...100 YEARS OR MORE/ IS DIFFICULT UNLESS RECORDS FROM THE VARIOUS LOCATIONS ARE THREADED TOGETHER. THREADING A STATION RECORD INVOLVES A NUMBER OF STEPS. THE RECORD OF A CURRENTLY ACTIVE STATION IS USED AS THE STARTING POINT FOR A STATION THREAD. THIS STATION/S CURRENT RECORD IS USED AS FAR BACK IN TIME AS POSSIBLE. OTHER LOCAL WEATHER STATIONS NEARBY ARE THEN IDENTIFIED TO EXTEND THE THREAD FURTHER BACK IN TIME... WITH PREFERENCE GIVEN TO NATIONAL WEATHER SERVICE/WEATHER BUREAU STATIONS. THE THREAD IS EXTENDED BACK IN TIME AS FAR AS POSSIBLE USING NOAA DAILY DATA AVAILABLE IN DIGITAL FORM. INPUT FROM PARTNERS AND NWS WEATHER FORECAST OFFICES WAS THEN SOLICITED AND THIS LOCAL EXPERTISE WAS USED TO FINE-TUNE THE STATION THREADS. THREADEX IS A COLLABORATIVE EFFORT BETWEEN NWS...NOAA/S NATIONAL CLIMATIC DATA CENTER...THE NORTHEAST REGIONAL CLIMATE CENTER...AND STATE CLIMATOLOGISTS.
FOR QUESTIONS REGARDING THE THREADEX PROJECT...CONTACTMICHAEL J. BREWER NWS/OS4 1325 EAST WEST HWY SILVER SPRING MD 20910-3283 PHONE: 301-713-1970 EXT 123
NWS TECHNICAL IMPLEMENTATION NOTICES ARE ONLINE AT: /USE LOWER CASE/HTTP://WWW.NWS.NOAA/GOV/OM/NOTIF.HTM
$$
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