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066 NOXX10 KWBC 281241 DATA MGT MESSAGE 02-02.15 TO AWIPS/NOAAPORT USERS... FAMILY OF SERVICES /FOS/ SUBSCRIBERS EMERGENCY MANAGERS WEATHER INFORMATION NETWORK /EMWIN/NATIONAL WEATHER SERVICE /NWS/ CUSTOMERS... WAFS USERS... GTS USERS... NWS FAX CHART USERS FROM RTH WASHINGTON DATA MANAGEMENT SUBJECT UPCOMING CHANGES TO THE NCEP GLOBAL FORECAST SYSTEM IN LATE WINTER AND SPRING OF 2002... NCEP WILL BE MAKING SEVERAL CHANGES TO ITS GLOBAL FORECAST SYSTEM /GFS/. THE NCEP GFS INCLUDES THE MRF... THE AVN... AND THE GLOBAL DATA ASSIMILATION SYSTEM /GDAS/... WHICH IS ALSO KNOWN AS THE FNL. CURRENTLY THE MRF RUN OF THE GFS IS RUN ONCE PER DAY AT 00 UTC. THE RESOLUTION OF THE MRF IS T170L42 /75 KM HORIZONTAL/ OUT TO 168 HOURS AND T62L28 /210 KM HORIZONTAL/ RESOLUTION FROM 180 TO 384 HOURS. OUTPUT ARE MADE AVAILABLE FROM THE MRF IN 12-HOUR INCREMENTS. THE AVN RUN OF THE GFS IS CURRENTLY RUN FOUR TIMES PER DAY AT T170L42 RESOLUTION. AT 00 AND 12 UTC THE AVN PRODUCES FORECAST OUT TO 126 HOURS AND AT 06 AND 18 UTC IT PRODUCES FORECASTS TO 84 HOURS. ALL FOUR RUNS OF THE AVN PRODUCE OUTPUT IN 3-HOUR INCREMENTS. THE GDAS RUN OF THE GFS IS RUN FOUR TIMES PER DAY AT BOTH T170L42 AND T62L28 RESOLUTIONS AND PRODUCES A NINE HOUR FORECAST THAT IS USED AS INPUT INTO THE NEXT RUN OF THE AVN AND FNL. THE FIRST CHANGE TO THE NCEP GFS HAS BEEN TENTATIVELY SCHEDULED FOR 5 MARCH 2002. ON THIS DATE THE LENGTH OF ALL FOUR RUNS OF THE AVN WILL BE INCREASED TO 384 HOURS. THESE RUNS WILL BE MADE AT T170L42 RESOLUTION OUT TO 180 HOURS WITH OUTPUT IN 3-HOUR INCREMENTS. FROM 192 TO 384 HOURS THE RESOLUTION OF THESE RUNS WILL BE REDUCED TO T62L28 WITH OUTPUT IN 12-HOUR INCREMENTS. THERE ARE CURRENTLY NO PLANS TO DISSEMINATE THESE ADDITIONAL DATA ANYWHERE EXCEPT FOR THE NWS AND NCEP FTP SERVERS. PLEASE NOTE THAT THIS IMPLEMENTATION WILL NOT CHANGE ANY OF THE EXISTING AVN PRODUCTS ALREADY BEING DISSEMINATED FROM NCEP. AFTER THIS IMPLEMENTATION THE NEXT CHANGE TO THE NCEP GFS IS TENTATIVELY SCHEDULED FOR 23 APRIL 2002. ON THIS DATE THE MRF RUN WILL BE DISCONTINUED. NCEP WILL CREATE AND DISSEMINATE MRF LOOK ALIKE GRIB FILES FROM THE 00 UTC AVN RUN. THESE LOOK ALIKE GRIB FILES WILL BE CREATED FOR APPROXIMATELY 6 MONTHS WHICH WILL ALLOW USERS OF THESE PRODUCTS TIME TO TRANSITION TO THE EXTENDED AVN RUNS. NCEP WILL MAKE THESE LOOK ALIKE GRIB FILES AVAILABLE UNDER TEST DIRECTORIES ON THE NWS AND NCEP FTP SERVERS SHORTLY AFTER THE EXTENSION OF THE AVN IS IMPLEMENTED ON 5 MARCH 2002. FINALLY... PENDING CAFTII APPROVAL IN MARCH 2002... THE RESOLUTION OF THE GFS WILL BE INCREASED TO T256L64 /55 KM HORIZONTAL/ RESOLUTION. THIS IMPLEMENTATION DATE HAS BEEN TENTATIVELY SCHEDULED FOR SOMETIME IN MAY 2002. MORE DETAILS ON THIS IMPLEMENTATION WILL BE FORTHCOMING AFTER CAFTII APPROVAL. NCEP APPRECIATES YOUR PATIENCE AS WE TRANSITION TO A BETTER GFS. FOR FOS/NOAAPORT AND NON-AWIPS CUSTOMERS - IF YOU HAVE ANY QUESTIONS REGARDING THIS NOTICE... PLEASE CONTACT DATA MANAGEMENT LOWER CASE EMAIL NWS.DM/AT SYMBOL//NOAA.GOV THIS INFORMATION IS ALSO POSTED ON THE NWS DATA MANAGEMENT CHANGE NOTICES WEB PAGE THE URL IS LISTED BELOW HTTP/COLON///WWW.NWS.NOAA.GOV/DATAMGMT/NOTICES.SHTML DATA MANAGEMENT TELECOMMUNICATION OPERATIONS CENTER RTH WASHINGTON SENDS ---------- End Forwarded Message ----------
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