SWOD48
SPC AC 280850
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0350 AM CDT SAT AUG 28 2010
VALID 311200Z - 051200Z
...PREDICTABILITY TOO LOW TO DELINEATE A SEVERE THREAT AREA...
THE EXTENT OF THE SEVERE POTENTIAL ACROSS THE UPPER MISSISSIPPI
VALLEY/UPPER GREAT LAKES REGION FOR TUESDAY REMAINS UNCLEAR. THE
RETURN OF AN ANOMALOUSLY MOIST BOUNDARY LAYER APPEARS LIKELY ON THE
WESTERN PERIPHERY OF A WEAKENING UPPER SUBTROPICAL HIGH CENTER OVER
THE MID ATLANTIC COAST STATES. BUT THE VIGOROUS SHORT WAVE IMPULSE
EMERGING FROM THE INTERMOUNTAIN WEST LATE THIS WEEKEND IS PROGGED TO
GENERALLY LIFT NORTH NORTHEAST OF THE CENTRAL CANADIAN/U.S. BORDER
AREA...WITH THE ASSOCIATED SURFACE CYCLONE LIFTING ACROSS NORTHWEST
ONTARIO TOWARD HUDSON BAY. THIS MAY BE FAR ENOUGH NORTH THAT FLOW
FIELDS AND VERTICAL SHEAR WEAKEN SUFFICIENTLY ALONG THE
FRONT...TRAILING SOUTHWARD ACROSS THE UPPER MIDWEST...TO MITIGATE
THE RISK FOR A SIGNIFICANT REGIONAL SEVERE WEATHER EVENT.
THEREAFTER...THE SPREAD AMONG MEDIUM RANGE FORECAST GUIDANCE REMAINS
LARGE CONCERNING SHORT WAVE DEVELOPMENTS WITHIN A BAND OF STRONG
WESTERLIES PROGGED TO TRAVERSE THE NORTHERN TIER OF THE U.S...FROM
THE MIDDLE OF NEXT WEEK INTO EARLY NEXT WEEKEND.
..KERR.. 08/28/2010
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