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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
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761 NOUS42 KWNO 140141 ADMNFD SPECIAL NCEP DISCUSSION CENTRAL OPERATIONS/NOAA/NWS/NCEP WASHINGTON DC 0130 UTC FRI NOV 14 2003 <snip> IMPORTANT NOTICE FYI...A NUMERICAL INSTABILITY ASSOCIATED WITH VERY HIGH WIND SPEEDS..GREATER THAN 120 M/S..FORCED BY ANOMALOUS STARATOSPHERIC EVENTS NEAR 45N IN THE NORTHERN ATLANTIC AND SMILAR CONDITIONS NEAR ASIA WAS THE CAUSE OF THE GLOBAL FORECAST SYSTEM..GFS..MODEL FAILURES AT 13/00Z AND 13/06Z. TO SOLVE THIS PROBLEM NCEP REDUCED THE TIME STEP IN THE FORECAST MODEL. THIS TIME STEP REDUCTION WILL TEMPORARILY CAUSE A 4 MIN. DELAY IN THE DELIVERY OF GFS PRODUCTS BEYOND 180HRS. THE GFS IMPLEMENTATION SCHEDULED FOR 11/18 HOWEVER WILL APPROXIMATELY RECOVER THIS DELAY IN THE GFS MODEL RUN TIME. ALSO...GOES 12/EAST SRSO IS SCHEDULED FROM 1343Z-1926Z ON FRI NOV 14TH FOR THORPEX RESEARCH. BUREK/SDM/NCO/NCEP NNNN ---------- End Forwarded Message ----------
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