[nws-changes] 20100430: RUC dissemination times[Fwd: ADMIN NOTICE NOUS41 KWBC]

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-------- Original Message --------

305 NOUS41 KWBC 301902
PNSWSH

TECHNICAL IMPLEMENTATION NOTICE 10-19
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
305 PM EDT FRI APR 28 2010

TO:       SUBSCRIBERS:
-FAMILY OF SERVICES -NOAA WEATHER WIRE SERVICE
         -EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
-NOAAPORT OTHER NWS PARTNERS...USERS AND EMPLOYEES
FROM:     TIMOTHY MCCLUNG
         SCIENCE PLANS BRANCH CHIEF
OFFICE OF SCIENCE AND TECHNOLOGY SUBJECT: CHANGE TO RUC MODEL DISSEMINATION TIME: EFFECTIVE APRIL 27 2010
NCEP HAS EXPERIENCED SEVERAL RECENT FAILURES OF THE RAPID 
UPDATE CYCLE /RUC/ MODEL. THESE FAILURES ARE DUE TO 
VIOLATIONS OF THE COURANT-FRIEDRICHS-LEVY /CFL/ STABILITY 
CONDITION...WHICH CAN OCCUR IN VARIOUS SITUATIONS...BUT HAVE 
BEEN EXPERIENCED RECENTLY ON THE EAST SIDE OF THE SIERRAS 
WITH STRONG MOUNTAIN WAVES.  

TO PREVENT THESE FAILURES...ON TUESDAY APRIL 27 AT 0006 
COORDINATED UNIVERSAL TIME /UTC/ A CHANGE WAS MADE TO THE 
OPERATIONAL CONFIGURATION OF THE RUC...SPECIFICALLY THE MODEL 
TIME STEP.  

THIS CHANGE RESULTS IN A SLIGHT DELAY TO THE OUTPUT PRODUCT 
SCHEDULE:  

    APPROXIMATELY 1 MINUTE FOR THE 6-HR FORECAST PRODUCTS 
    APPROXIMATELY 2 MINUTES FOR THE 12-HR FORECAST PRODUCTS
    APPROXIMATELY 3 MINUTES FOR THE 18-HR FORECAST PRODUCTS  

NCEP WILL RUN THE RUC IN THIS OPERATIONAL CONFIGURATION UNTIL 
FURTHER NOTICE. THESE CHANGES ARE NECESSARY TO ELIMINATE 
INTERMITENT MODEL FAILURES WHICH RESULT IN SIGNIFICANTLY 
LATER PRODUCT ARRIVAL TIMES OR MISSING DATA FOR SOME CYCLES.  

IF YOU HAVE QUESTIONS OR CONCERNS ABOUT THIS CHANGE...PLEASE 
CONTACT: 

 REBECCA COSGROVE
 NCEP/NCO DATAFLOW GROUP
 CAMP SPRINGS MARYLAND
 PHONE: 301-763-8000 X7148
 EMAIL: NCEP.PMB.DATAFLOW@xxxxxxxx

NWS NATIONAL TECHNICAL IMPLEMENTATION NOTICES ARE ONLINE AT /USE LOWERCASE/:
    HTTP://WWW.NWS.NOAA.GOV/OS/NOTIF.HTM

$$
NNNN





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