SPC AC 221020
   
   DAY 3 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0520 AM CDT FRI AUG 22 2003
   
   VALID 241200Z - 251200Z
   
   ...NO SVR TSTM AREAS FORECAST...
   
   ...SYNOPSIS...
   LARGE SCALE PATTERN OVER THE U.S. WILL UNDERGO LITTLE CHANGE DURING
   MUCH OF THE DAY 3 PERIOD...THOUGH STRONG/PROGRESSIVE TROUGH IS
   FORECAST TO MOVE ACROSS THE NRN ROCKIES LATE IN THE PERIOD AND BEGIN
   BREAKING DOWN LARGE RIDGE OVER THE NRN PLAINS.
   SURFACE FRONT IS FORECAST TO EXTEND FROM THE NRN GREAT LAKES SWWD
   INTO THE SRN WI/SRN MN AND THEN RUN E-W ACROSS SD BY LATE IN THE
   DAY.
   
   ...NRN PLAINS...
   THOUGH MODERATE TO STRONG INSTABILITY IS EXPECTED BY THE AFTERNOON
   INVOF SURFACE FRONT...STRONG CAP SHOULD LIMIT DEVELOPMENT ALONG IT. 
   IN ADDITION...FRONT APPEARS TO SHIFT FAR ENOUGH SOUTH THAT IT
   BECOMES DISPLACED FROM THE STRONGER WESTERLIES TO ITS NORTH. 
   HOWEVER...STRONG HEATING AND SUSTAINED LOW LEVEL WAA SHOULD SUPPORT
   THUNDERSTORM DEVELOPMENT ALONG AND NORTH OF THE FRONT ACROSS
   PORTIONS OF SD LATE SUNDAY AND SUNDAY EVENING...WHICH MAY CONTINUE
   EWD OVERNIGHT. SHEAR AND INSTABILITY PARAMETERS SUGGEST ISOLATED
   STRONG/SEVERE THUNDERSTORMS MAY ACCOMPANY THIS ACTIVITY...THOUGH
   LIMITING FACTORS PRECLUDE SLIGHT RISK ISSUANCE ATTM.
   
   ..EVANS.. 08/22/2003
   
   ...NOTICE...
   FOR USERS DECODING THE POINTS PARAGRAPH HEREIN...LATITUDE AND
   LONGITUDE POINTS FOR THE CATEGORICAL AND PROBABILISTIC OUTLOOK
   GRAPHICS ALSO ARE LOCATED IN A SEPARATE PRODUCT UNDER THE WMO
   HEADINGS WUUS01 PTSDY1...WUUS02 PTSDY2...AND WUUS03 PTSDY3.  THE
   INCLUSION OF POINTS IN THIS PRODUCT WILL EVENTUALLY BE DISCONTINUED.
   
   NOTE: THE NEXT DAY 3 OUTLOOK IS SCHEDULED FOR 1200Z