Chicago Climate Stations are now "Threaded"

NOUS43 KLOT 082226
PNSLOT

TECHNICAL IMPLEMENTATION NOTICE
NATIONAL WEATHER SERVICE CHICAGO
426 PM CST FRI FEB 08 2008

TO:        FAMILY OF SERVICES /FOS/ SUBSCRIBERS...NOAA WEATHER
           WIRE SERVICE /NWWS/ SUBSCRIBERS...EMERGENCY
           MANAGERS WEATHER INFORMATION NETWORK /EMWIN/
           SUBSCRIBERS...NOAAPORT SUBSCRIBERS...NATIONAL WEATHER
           SERVICE /NWS/ PARTNERS AND OTHER USERS...AND NWS
           EMPLOYEES

FROM:      EDWARD FENELON
           METEOROLOGIST IN CHARGE-NWS CHICAGO

SUBJECT:   NOAA UPDATES ITS LONG-TERM STATION EXTREMES OF DAILY
TEMPERATURE AND PRECIPITATION FOR DATA THROUGH
2007.

LONG-TERM STATION EXTREMES OF DAILY TEMPERATURE AND PRECIPITATION
FOR KEY U.S. WEATHER STATIONS HAVE BEEN UPDATED FOR DATA THROUGH
2007.

FOR THE AREA COVERED BY THE NWS CHICAGO...THIS INCLUDES THE
FOLLOWING STATIONS:

                             ..IN DAILY CLIMATE REPORT..
STATION  PERIOD OF RECORD     WMO HEADING    AWIPS ID

.CHICAGO    1871-PRESENT          CDUS43       CLICHI
.ROCKFORD   1906-PRESENT          CDUS43       CLIRFD

IN ORDER 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:

HTTP://THREADEX.RCC-ACIS.ORG/    USE LOWER CASE

NOAA HAS BUILT "THREADS" FOR THE APROXIMATELY 268 LOCATIONS
NATIONWIDE...INCLUDING THE STATIONS LISTED ABOVE...THAT ARE
PUBLISHED IN NCDC/S LOCAL CLIMATOLOGICAL DATA /LCD/. THE EXTREMES
DERIVED FROM THE THREADS ARE USED IN THE NWS/S DAILY CLIMATE REPORTS
/CLI/...INCLUDING THE REPORTS LISTED ABOVE.

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...ONE
HUNDRED 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
/INCLUDING 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 THE NWS...NOAA/S NATIONAL
CLIMATIC DATA CENTER...THE NORTHEAST REGIONAL CLIMATE CENTER...AND
STATE CLIMATOLOGISTS.

IF YOU HAVE QUESTIONS REGARDING THE THREADEX PROJECT...CONTACT

TIM HALBACH
NATIONAL WEATHER SERVICE CHICAGO
CLIMATE FOCAL POINT
333 W. UNIVERSITY DR
ROMEOVILLE IL 60446
815-834-0600 EXT 648



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