SPC AC 181918
   
   DAY 1 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0118 PM CST WED FEB 18 2004
   
   VALID 182000Z - 191200Z
   
   THERE IS A SLGT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM BIH
   NID 10 ESE PMD 45 WSW BFL 50 NNW PRB 30 NNW MER 60 NE MER BIH.
   
   GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 55 S UKI SAC 55 NNW
   DRA GCN SOW 70 E PHX 10 WNW PHX BLH CZZ.
   
   ...THERE IS A SLGT RISK OF SVR TSTMS THIS AFTERNOON AND EVENING OVER
   PARTS OF CENTRAL CA...
   
   ...CA...
   WATER VAPOR IMAGERY SHOWS VIGOROUS UPPER VORT MAX OFF THE CENTRAL CA
   COAST. THIS FEATURE IS EXPECTED TO TRACK EAST-SOUTHEASTWARD ACROSS
   SOUTHERN CA AND INTO CENTRAL AZ THIS FORECAST PERIOD.  VISIBLE
   SATELLITE IMAGERY SHOWS CONSIDERABLE BREAKS IN THE CLOUDS DEVELOPING
   OVER CENTRAL CA...WHERE COLD TEMPERATURES ALOFT AND STEEP LAPSE
   RATES WILL BE PRESENT. THIS SHOULD RESULT IN POCKETS OF MUCAPE
   BETWEEN 500-1000 J/KG THIS AFTERNOON.  SCATTERED THUNDERSTORMS ARE
   EXPECTED TO DEVELOP NEAR AND JUST SOUTH OF SFO IN THE NEXT FEW HOURS
   AND MOVE/DEVELOP SOUTHEASTWARD ACROSS THE CENTRAL/SOUTHERN INTERIOR
   VALLEY.  THE STRONGER CELLS IN THIS REGION WILL HAVE A POTENTIAL FOR
   LARGE HAIL.  SEVERE THREAT SHOULD DIMINISH AFTER DARK AS DIURNAL
   COOLING DECREASES INSTABILITY. NEVERTHELESS...A CLUSTER OF
   THUNDERSTORMS MAY ACCOMPANY THE VORT CENTER OVERNIGHT AS IT TRACKS
   EASTWARD INTO CENTRAL AZ.
   
   ELSEWHERE...NO ORGANIZED THUNDERSTORM ACTIVITY IS FORECAST TODAY.
   
   ..HART.. 02/18/2004
   
   ...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 0100Z