SPC AC 201220
   
   DAY 1 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0620 AM CST SAT DEC 20 2003
   
   VALID 201300Z - 211200Z
   
   GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 55 SSE UKI 30 E SAC
   40 NNE BIH 60 W P38 25 SSE LAS 55 ENE DAG 30 WNW EDW 35 SW BFL 20
   WNW SMX.
   
   ...NO SVR TSTM AREAS FORECAST...
   
   ...SYNOPSIS...
   PROGRESSIVE UPPER FLOW PATTERN WILL CONTINUE ACROSS THE CONUS TODAY
   AS A DEEP TROUGH IN THE EAST LIFTS ENEWD OFF THE ATLANTIC
   SEABOARD...A BROAD UPPER RIDGE DEAMPLIFIES WHILE TRANSITIONING
   ACROSS THE PLAINS AND MS VALLEY...AND A STRONG IMPULSE MOVES INLAND
   ACROSS THE WEST COAST FROM THE PACIFIC. MOST AREAS WILL AGAIN REMAIN
   TOO DRY/COOL AND STABLE FOR TSTM DEVELOPMENT WITH THE POSSIBLE
   EXCEPTION OF ISOLATED AREAS OF CNTRL CA AND THE GREAT BASIN.
   
   ...CA/NV...
   WHILE A LEADING SHORT WAVE TROUGH CONTINUES TO WEAKEN AS IT LIFTS
   NEWD ACROSS NV THIS MORNING...A STRONGER MID/UPPER LEVEL WAVE WAS
   EVIDENT ON WATER VAPOR IMAGERY PASSING 130W. THIS DISTURBANCE WAS
   TRACKING GENERALLY TO THE EAST AT ABOUT 40KT AND WILL ARRIVE NEAR
   THE CA COAST LATE THIS AFTERNOON...AND MOVE ACROSS CNTRL CA AND SWRN
   NV THROUGH TONIGHT. MODEL TRENDS HAVE SUGGESTED SLIGHTLY GREATER
   INSTABILITY MAY ACCOMPANY THIS SYSTEM THAN EARLIER FCSTS AND
   OFFSHORE LTG DETECTION HAS BEEN INDICATING OCCASIONAL CG STRIKES
   WITHIN THE COMMA HEAD AND FRONTAL BAND. STRONG ASCENT AND MODEST
   DESTABILIZATION ON THE CYCLONIC SHEAR SIDE OF MID/UPPER JET SHOULD
   ACCOMPANY THE SYSTEM AS IT CROSSES CNTRL CA LATER TONIGHT. IN
   ADDITION...COOLING MID LEVEL TEMPERATURES ACROSS COASTAL AND CNTRL
   CA IN THE 21/03-06Z TIME FRAME WILL RESULT IN STEEPENING LAPSE
   RATES...MUCAPE OF 100-150 J/KG...AND MARGINALLY SUPPORTIVE EL TEMPS
   AROUND -15C FOR CHARGE SEPARATION. THEREFORE...A GENL TSTM AREA WILL
   BE INTRODUCED ACROSS PORTIONS OF CA AND SWRN NV WITH THIS OUTLOOK.
   
   ..CARBIN.. 12/20/2003
   
   ...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 1630Z