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NOUS41 KWBC 221200
PNSWSH
TECHNICAL IMPLEMENTATION NOTICE 09-37
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON D.C.
800 AM EST THU OCT 22 2009
TO: SUBSCRIBERS:
-FAMILY OF SERVICES
-NOAA WEATHER WIRE SERVICE
-EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
-NOAAPORT
OTHER NWS PARTNERS...USERS AND EMPLOYEES
FROM: JAY LAWRIMORE
CHIEF... CLIMATE ANALYSIS BRANCH
NATIONAL CLIMATIC DATA CENTER
SUBJECT: EMERGENCY REVISION OF PRODUCT SXXX91 CRND01: EFFECTIVE
OCTOBER 21 2009
EFFECTIVE OCTOBER 21 2009 THE SXXX91 CRND01 PRODUCT... ALSO KNOWN
AS THE DAILY01... PROVIDES USERS WITH A SUMMARY TABLE OF DAILY
CLIMATE VARIABLES FOR THE U.S. CLIMATE REFERENCE NETWORK (USCRN)
STATIONS. THIS PRODUCT HAS UNDERGONE AN EMERGENCY REVISION DUE TO
THE DISCOVERY OF AN OFFSET BETWEEN THE INTENDED DAY PERIOD OF LOCAL
MIDNIGHT-TO-MIDNIGHT AND THE TIME PERIOD ACTUALLY USED FOR
CALCULATING DAILY VALUES... LOCAL 4 AM-TO-4 AM. THIS CONDITION
EXISTED FROM APRIL 2009 UNTIL MID-OCTOBER 2009. WHILE CORRECTING
THIS ISSUE... THE OPPORTUNITY WAS TAKEN TO MAKE SEVERAL OTHER
TECHNICAL CORRECTIONS AND IMPROVEMENTS.
TECHNICAL CORRECTIONS:
- TIME FRAME USED TO LOOK FOR STATION UPDATES WAS ALSO CORRECTED.
TECHNICAL IMPROVEMENTS:
- TRANSMISSION ROWS ARE NOW ORDERED ACCORDING TO STATION WBAN
NUMBER DESIGNATIONS. THIS MAKES MANUALLY LOCATING A PARTICULAR
STATION IN AN UPDATE FILE EASIER.
- TRANSMISSIONS OMIT STATIONS THAT ARE NOT ACTIVE. THIS PREVENTS
ROWS OF MISSING VALUES FROM BEING DISPLAYED FOR STATIONS WHICH ARE
NOT ON RECORD. STATIONS THAT ARE ON RECORD BUT HAVE NOT PROVIDED
ENOUGH OBSERVATIONS TO CALCULATE DAILY VALUES WILL CONTINUE TO BE
REPRESENTED BY MISSING VALUE INDICATORS.
- TRANSMISSIONS ARE RESTRICTED TO THE TWO MOST RECENT DAYS TO
AVOID OVERLOADING USERS WITH OLDER UPDATES BEST FOUND BY
DOWNLOADING STATION-YEAR FILES THROUGH FTP. ANY CHANGES IN DATA
PRIOR TO THE TWO MOST RECENT DAYS MUST BE FOUND IN THE
SUBDIRECTORIES AT THE URL PROVIDED BELOW.
ANY PREVIOUS VERSIONS OF THE SXXX91 CRND01 PRODUCT (DAILY01) DATA
ARE CONSIDERED BY NCDC TO BE OBSOLETE AND UNSUITABLE FOR
SCIENTIFIC USE. REGENERATED USCRN DAILY DATA FILES ORDERED BY
YEAR AND STATION CAN BE FOUND AT THE URL PROVIDED BELOW:
FTP://FTP.NCDC.NOAA.GOV/PUB/DATA/USCRN/PRODUCTS/DAILY01/
THE EFFECTIVE DATE OF THIS CHANGE IS SOONER THAN SPECIFIED BY NWS
POLICY /NWS INSTRUCTION 10-1805/. THE SHORTER ADVANCE LEAD TIME WAS
NECESSITATED BY SOFTWARE PROBLEMS AND WAS APPROVED BECAUSE CURRENT
USERS WILL NOT HAVE TO MAKE ANY SIGNIFICANT ADJUSTMENTS TO ACCOMMODATE
THE CHANGE.
IF YOU HAVE QUESTIONS OR FEEDBACK...PLEASE CONTACT:
NATIONAL CLIMATIC DATA CENTER
151 PATTON AVE
ASHEVILLE, NC 28803
NCDC.CRN@xxxxxxxx
NWS NATIONAL TECHNICAL IMPLEMENTATION NOTICES ARE ONLINE AT
/USE LOWERCASE/:
HTTP://WWW.WEATHER.GOV/OS/NOTIF.HTM
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