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
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