SPC AC 280708

   DAY 3 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0208 AM CDT WED AUG 28 2013

   VALID 301200Z - 311200Z

   ...NO SVR TSTM AREAS FORECAST...

   ...MIDWEST...

   RIDGE-TOPPING SHORT-WAVE TROUGH IS EXPECTED TO DIG SEWD ACROSS THE
   UPPER MS VALLEY TO A POSITION FROM WI INTO NERN IA BY 30/18Z. 
   CONSIDERABLE AMOUNT OF CONVECTION MAY EVOLVE AHEAD OF THIS FEATURE
   WITH MULTIPLE THUNDERSTORM CLUSTERS LIKELY TO BE ONGOING AT SUNRISE
   FRIDAY MORNING.  WITH LOW LEVEL WARM ADVECTION EXPECTED TO AID THIS
   ACTIVITY...VEERING LLJ SHOULD DRIVE MCS-TYPE ACTIVITY ACROSS NRN WI
   INTO LOWER MI WHERE WEAKER INSTABILITY IS LIKELY TO BE OBSERVED. 
   WHILE GUSTY WINDS AND PERHAPS SOME HAIL MAY BE NOTED WITH EARLY
   MORNING ELEVATED CLUSTERS...THERE IS SOME CONCERN THAT DAYTIME
   HEATING MAY PROVIDE SUFFICIENT DESTABILIZATION FOR RENEWED
   DEVELOPMENT ALONG SWRN FLANK OF THIS ACTIVITY.  IF SO POTENTIALLY
   MORE SIGNIFICANT CONVECTION COULD EVOLVE WITHIN MODEST NWLY FLOW
   REGIME AHEAD OF DIGGING SHORT-WAVE TROUGH.  FOR NOW 5 PERCENT SEVERE
   PROBS APPEAR ADEQUATE FOR THIS SCENARIO.

   ...WRN DAKOTAS...

   ANOTHER SIGNIFICANT SHORT-WAVE TROUGH IS EXPECTED TO SHIFT EAST
   ACROSS BC/AB INTO SK DURING THE LATTER HALF OF THE PERIOD.  SRN
   INFLUENCE OF THIS FEATURE MAY PROVIDE ENOUGH ASCENT ACROSS WRN
   DAKOTAS FOR LATE AFTERNOON/EVENING THUNDERSTORMS ALONG WEAK COLD
   FRONT.  PRIMARY FORCING IS EXPECTED TO REMAIN NORTH OF THE BORDER
   BUT IF SUFFICIENT DESTABILIZATION OCCURS ACROSS THE NRN HIGH PLAINS
   A FEW STRONG STORMS COULD EVOLVE.  SEVERE PROBS MAY BE ADDED IN
   LATER OUTLOOKS ACROSS THIS REGION.

   ..DARROW.. 08/28/2013

   CLICK TO GET WUUS03 PTSDY3 PRODUCT

   NOTE: THE NEXT DAY 3 OUTLOOK IS SCHEDULED BY 0730Z