SWOD48
SPC AC 210831
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0331 AM CDT SUN SEP 21 2008
VALID 241200Z - 291200Z
...DISCUSSION...
LATEST MEDIUM RANGE GUIDANCE IS FAIRLY CONSISTENT REGARDING THE MOST
DOMINANT LARGE SCALE FEATURE...NAMELY THE UPPER RIDGE OVER THE SWRN
U.S. AND ITS SUBSEQUENT NEWD MOVEMENT INTO THE CNTRL PLAINS BY THE
END OF THE WEEK. ALONG THE NRN FRINGE OF THIS FEATURE AN ACTIVE WLY
CURRENT OF HIGH LEVEL FLOW WILL MAINTAIN A PARADE OF SHORTWAVES
NEAR/NORTH OF THE U.S./CANADIAN BORDER. THIS FAST FLOW REGIME WILL
MAKE IT EXTREMELY DIFFICULT TO PREDICT TIMING/LOCATION OF NARROW
WEDGES OF MODEST INSTABILITY AND WHERE THEY MAY ENHANCE DEEP
CONVECTION ALONG SRN EDGE OF STRONGER SHEAR. SEVERE PREDICTABILITY
IS TOO LOW TO WARRANT AN OUTLOOK THIS PERIOD.
..DARROW.. 09/21/2008
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