NOUS41 KWBC 021919 AAA
PNSWSH

TECHNICAL IMPLEMENTATION NOTICE 03-48...AMENDED
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC 
225 PM EST MON FEB 1 2004

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

FROM:	   PAUL HIRSCHBERG
	   CHIEF...SCIENCE PLANS BRANCH 
 	   OFFICE OF SCIENCE AND TECHNOLOGY /OST/ 

SUBJECT:   AMENDED...CHANGE TO ISSUANCE TIME OF ETA MOS 
	   GUIDANCE...EFFECTIVE FEBRUARY 17 2004 AT 1200 UTC

REFER TO:  TECHNICAL IMPLEMENTATION NOTICE /TIN/ 03-49 /AMENDED/ 
           FOR ADDITIONAL ETA MOS CHANGES TO BE IMPLEMENTED 
           FEBRUARY 24 2004

AMENDED TO CHANGE SUBJECT LINE…EFFECTIVE DATE…AND FIRST PARAGRAPH 
TO EMPHASIZE DELAY IN MESSAGE TRANSMISSION TIME.

NOTE...THE FOLLOWING CHANGES HAVE NO IMPACT ON NOAA WEATHER 
WIRE SUBSCRIBERS 

ATTENTION USERS OF THE MODEL OUTPUT STATISTICS /MOS/ GUIDANCE:

ON TUESDAY...FEBRUARY 17 2004 AT 1200 COORDINATED UNIVERSAL TIME 
/UTC/...THE NWS WILL IMPLEMENT NEW EQUATIONS USED TO PRODUCE THE 
ETA MOS GUIDANCE.  THESE EQUATIONS WERE DEVELOPED FROM A HIGH-
RESOLUTION ARCHIVE...IN TIME AND IN SPACE...OF THE ETA MODEL.  
DUE TO THIS CHANGE...ETA MOS GUIDANCE WILL BE DISSEMINATED 
APPROXIMATELY 30 MINUTES LATER THAN CURRENTLY TRANSMITTED.  THIS 
MODIFICATION IS NECESSARY TO IMPROVE THE ACCURACY OF THE GUIDANCE 
FOR FORECAST PROJECTIONS GREATER THAN 48 HOURS.  SAMPLE 
VERIFICATIONS CAN BE FOUND ONLINE AT /USE LOWER CASE LETTERS/:

	HTTP://WWW.NWS.NOAA.GOV/MDL/SYNOP/TIN/ETA32VERIF.HTM 

PLEASE NOTE THAT THE IMPLEMENTATION OF THIS CHANGE HAS BEEN 
DELAYED TWO WEEKS TO ENSURE THAT ALL USERS OF THE MOS PRODUCTS 
HAVE BEEN ADEQUATELY NOTIFIED.

THE CONTENT OF THE ETA MOS GUIDANCE WILL NOT CHANGE ON THIS 
DATE…HOWEVER…USERS SHOULD REFER TO TIN 03-49 /AMENDED/ FOR 
ADDITIONAL CHANGES TO BE IMPLEMENTED FEBRUARY 24 2004

EFFECTIVE FEBRUARY 17TH...CHANGES WILL ALSO BE MADE TO THE STATIONS 
FOR WHICH GUIDANCE IS AVAILABLE.  FOUR STATIONS WILL BE REMOVED 
FROM THE CURRENT TEXT PRODUCTS...AND THE CALL LETTERS OF 3 SITES 
WILL BE UPDATED IN THE TEXT PRODUCTS.  LISTS OF ALL STATIONS IN 
THIS CHANGE ARE PROVIDED BELOW.


TABLE 1.  COMMUNICATION IDENTIFIERS FOR THE CURRENT ETA-BASED MOS 
TEXT PRODUCTS.  THE AWIPS IDS ARE METXXX...WHERE THE FINAL XXX 
DENOTES THE GEOGRAPHIC REGION FOR WHICH THE GUIDANCE IS VALID.

	WMO HEADING	AWIPS ID	GEOGRAPHIC REGION

	FOUS44 KWNO	METNE1		NORTHEAST CONUS
	FOUS45 KWNO	METSE1		SOUTHEAST CONUS
	FOUS46 KWNO	METNC1		NORTH CENTRAL CONUS
	FOUS47 KWNO	METSC1		SOUTH CENTRAL CONUS
	FOUS48 KWNO	METRM1		ROCKY MOUNTAIN CONUS
	FOUS49 KWNO	METWC1		WEST COAST CONUS

THE STATIONS BEING REMOVED FROM THE TEXT PRODUCTS ARE:

	     KNZJ      EL TORO...CALIFORNIA
	     KP07      SANDERSON...TEXAS
	     KRRF      PORT RICHEY...FLORIDA
	     KY22      LEMMON...SOUTH DAKOTA

THE FOLLOWING CALL LETTER IDENTIFIERS WILL BE UPDATED IN THE TEXT
PRODUCTS:

     SITE                      	FROM	  TO

     CECIL FIELD...FLORIDA     	KNZC      KVQQ
     CUSTER...SOUTH DAKOTA  	K0V1      KCUT
     DENNISON...TEXAS          	KF39      KGYI


LINKS TO THESE PRODUCTS...ALONG WITH DESCRIPTIONS...CAN BE FOUND
AT /USE LOWER CASE LETTERS/:

	HTTP://WWW.NWS.NOAA.GOV/MDL/SYNOP/PRODUCTS.SHTML

IF YOU HAVE ANY QUESTIONS OR CONCERNS ABOUT THESE CHANGES TO THE 
MOS GUIDANCE SYSTEM...PLEASE CONTACT:

	     PAUL DALLAVALLE 
	     MDL/SILVER SPRING MARYLAND 
	     PHONE:   301-713-0023 EXT. 135 
	     E-MAIL:  PAUL.DALLAVALLE@NOAA.GOV 

THIS AND OTHER NWS TECHNICAL IMPLEMENTATION NOTICES ARE AVAILABLE 
ON THE INTERNET AT /USE LOWER CASE LETTERS/:

	HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM

$$
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