SWOD48
SPC AC 280831
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0331 AM CDT SUN SEP 28 2008
VALID 011200Z - 061200Z
...POTENTIAL TOO LOW TO DELINEATE A REGIONAL SEVERE THREAT AREA...
THE AMPLIFIED UPPER FLOW PATTERN...BEGINNING TO DEVELOP ACROSS THE
U.S. LATE THIS WEEKEND...IS PROGGED TO PERSIST THROUGH MUCH OF THE
WORK WEEK...BEFORE TRANSITIONING TO A MORE ZONAL SPLIT FLOW REGIME
NEXT WEEKEND. MEDIUM RANGE FORECAST GUIDANCE IS SUGGESTIVE THAT A
MAJOR SHORT WAVE TROUGH COULD APPROACH THE PLAINS NEXT WEEKEND
...ACCOMPANIED BY LEE SURFACE TROUGHING AND THE ADVECTION OF WARM
ELEVATED MIXED LAYER AIR EAST OF THE HIGHER TERRAIN. HOWEVER...
PERSISTENT UPPER TROUGHING OVER THE WESTERN GULF BASIN...WITHIN THE
SOUTHERN BRANCH OF THE SPLIT FLOW...IS EXPECTED TO PRECLUDE A
SIGNIFICANT RETURN FLOW OF MOISTURE THROUGH AT LEAST THE END OF THIS
FORECAST PERIOD.
..KERR.. 09/28/2008
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