SPC AC 271619
   
   DAY 1 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   1019 AM CST THU NOV 27 2003
   
   VALID 271630Z - 281200Z
   
   THERE IS A SLGT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM 20 NE
   GLS 45 WNW POE 30 SW TXK 40 NW TXK 25 SE PGO 25 NW LIT 35 WSW MEM 25
   ENE GWO 15 NNE MEI 10 SW 0A8 25 NE MGM 15 ESE TOI 10 NW PFN.
   
   GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 15 E CRP 40 SSE CLL
   30 SSW MKO 15 WNW HRO 40 NNW POF 25 WNW LEX 35 ENE SSU 20 NNW RIC 45
   W ORF 20 SW GSB 10 WSW CAE 45 SE TLH.
   
   ...THERE IS A SLGT RISK OF SVR TSTMS ACROSS THE LOWER MS VALLEY....
   
   ...SYNOPSIS...
   A STRONG MID LEVEL TROUGH OVER N TX/OK WILL MOVE EWD TODAY TOWARD
   AR/LA...WHILE AN ASSOCIATED SURFACE LOW IN NE TX DEVELOPS ENEWD
   TOWARD NW MS THIS EVENING AND THE SRN APPALACHIANS AREA LATE
   TONIGHT.  BOUNDARY LAYER DEWPOINTS ARE IN THE LOW-MID 60S ACROSS THE
   LOWER MS VALLEY IN THE WARM SECTOR...THOUGH THE RICHER MOISTURE
   /68-72 F DEWPOINTS/ AND GREATER INSTABILITY ARE CONFINED TO THE
   TX/LA COASTS ALONG AND SE OF A WEAK SURFACE TROUGH/OUTFLOW BOUNDARY.
    THIS OUTFLOW BOUNDARY WILL LIKELY CONTINUE TO FOCUS THUNDERSTORM
   DEVELOPMENT THROUGH THE AFTERNOON ACROSS SRN LA/MS/AL AND THE UPPER
   TX COAST.
   
   ...SRN LA TO SRN AL...
   THE LLJ AND STRONGER LOW-LEVEL SHEAR IS SHIFTING NEWD ACROSS AL
   TOWARD THE SRN APPALACHIANS IN CONJUNCTION WITH A LEAD SHORTWAVE
   TROUGH EJECTING NEWD OVER THE MS/LOWER OH VALLEYS.  AN ISOLATED
   TORNADO OR TWO WILL BE POSSIBLE LATE THIS MORNING THROUGH EARLY
   AFTERNOON ACROSS S CENTRAL/SW AL WHERE SURFACE-BASED INSTABILITY AND
   THE 0-3 KM SRH IN EXCESS OF 300 M2/S2 WILL BE CO-LOCATED. 
   HOWEVER...THE TORNADO THREAT SHOULD DIMINISH GRADUALLY BY LATER THIS
   AFTERNOON.  ELSEWHERE...THE VEERED/WEAKENED LOW-LEVEL FLOW WILL
   LEAVE AN ENVIRONMENT CHARACTERIZED BY MAINLY DEEP LAYER SPEED SHEAR
   WITHIN THE LOWER MS VALLEY WARM SECTOR THE REMAINDER OF THE
   PERIOD...WITH EMBEDDED BOW ECHOES AND PERHAPS SPLITTING SUPERCELLS
   POSSIBLE.  A FEW DAMAGING GUSTS SHOULD BE THE MAIN SEVERE THREAT
   WITH STORMS ALONG THE OUTFLOW BOUNDARY FROM SRN LA TO SRN AL.
   
   
   ...E TX/NRN LA/SRN AR/W CENTRAL AND NW MS AREA...
   A PLUME OF STEEP MID LEVEL LAPSE RATES WAS OBSERVED THIS MORNING
   OVER TX...IN ADVANCE OF THE EWD MOVING MID LEVEL TROUGH.  EXPECT
   THESE STEEP LAPSE RATES TO SPREAD ENEWD OVER LA/AR DURING THE
   AFTERNOON...ABOVE RESIDUAL BOUNDARY LAYER DEWPOINTS IN THE 60S.  THE
   NET RESULT WILL BE THE DEVELOPMENT OF SUFFICIENT INSTABILITY FOR A
   FEW STORMS CAPABLE OF PRODUCING AT LEAST MARGINALLY SEVERE HAIL AND
   POSSIBLY DAMAGING WINDS DURING THE AFTERNOON/EVENING FROM SRN AR/NRN
   LA EWD TOWARD W/NW MS.
   
   ..THOMPSON/BANACOS.. 11/27/2003
   
   ...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