SPC AC 231553
   
   DAY 1 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   1053 AM CDT THU OCT 23 2003
   
   VALID 231630Z - 241200Z
   
   GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 40 NE ELO 50 E BRD 20
   W STC 35 NW AXN 75 N GFK.
   
   ...NO SVR TSTM AREAS FORECAST...
   
   ...SYNOPSIS...
   MID-LEVEL SHORTWAVE TROUGH / CURRENTLY ANALYZED OVER THE PACIFIC
   NW/WRN ALBERTA / WILL AMPLIFY THROUGH THE PERIOD AS IT TRANSLATES
   SEWD INTO THE NRN PLAINS TONIGHT. MEANWHILE...DOWNSTREAM CLOSED LOW
   OVER NEW ENGLAND IS FORECAST TO OPEN AND LIFT NEWD IN RESPONSE TO
   THE APPROACH OF THIS FEATURE.
   
   IN THE LOW-LEVELS...SURFACE LOW INITIALLY OVER ERN BC/WRN ALBERTA
   WILL DEEPEN SLIGHTLY AS IT MOVES/DEVELOPS EWD PRIOR TO OCCLUDING
   OVER MANITOBA LATE IN THE PERIOD. THE ASSOCIATED COLD FRONT WILL
   SURGE SEWD ACROSS THE NRN ROCKIES AND INTO THE NRN PLAINS/CNTRL HIGH
   PLAINS TONIGHT INTO FRIDAY MORNING.
   
   ...UPPER MS VALLEY...
   12Z SOUNDINGS INDICATED A RELATIVELY DRY LOW-LEVEL AIRMASS IN PLACE
   AHEAD OF APPROACHING SHORTWAVE TROUGH AND SURFACE COLD FRONT OVER
   THE NRN/CNTRL PLAINS. WITH TIME...STEEPENING LAPSE RATES AND
   MOISTENING MID-TROPOSPHERIC CONDITIONS VIA WAA/ISENTROPIC ASCENT
   PROCESSES WILL CONTRIBUTE TO WEAK INSTABILITY FOR PARCELS
   ORIGINATING BETWEEN 650 AND 600MB. CURRENT INDICATIONS ARE THAT A
   FEW LIGHTNING STRIKES WILL BE POSSIBLE OVERNIGHT ACROSS NRN MN IN
   ZONE OF FORCED ASCENT ALONG COLD FRONT.
   
   ..MEAD.. 10/23/2003
   
   ...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 1 OUTLOOK IS SCHEDULED FOR 2000Z