SWOD48
SPC AC 250820
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0320 AM CDT SUN SEP 25 2011
VALID 281200Z - 031200Z
...DISCUSSION...
NOTABLE DIFFERENCES DEVELOP WITHIN THE MEDIUM RANGE GUIDANCE
REGARDING THE EVOLUTION OF GREAT LAKES/OH VALLEY UPPER LOW BY DAY4.
ECMWF MAINTAINS A CLOSED CIRCULATION INTO THURSDAY/FRIDAY BEFORE
THIS FEATURE FINALLY LIFTS INTO NEW ENGLAND WHILE THE GFS IS
CONSIDERABLY FASTER. UNLESS SIGNIFICANT INSTABILITY CAN DEVELOP
AHEAD OF THIS EJECTING FEATURE THERE APPEARS TO BE LITTLE REASON FOR
ROBUST THUNDERSTORM DEVELOPMENT LATE IN THE WEEK. PREDICTABILITY IS
TOO LOW TO WARRANT A SEVERE OUTLOOK.
..DARROW.. 09/25/2011
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