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Mar- 6-2003 1300 UTC Day 1 Convective Outlook
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1300 UTC Day 1 Outlook Graphic
      
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   STORM PREDICTION CENTER...NWS/NCEP...NORMAN OK 
   DAY 1 CONVECTIVE OUTLOOK...REF AWIPS GRAPHIC PGWE46 KWNS.
   
   VALID 061300Z - 071200Z
   
   THERE IS A SLGT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM
   15 NNW MGM LGC 35 NNW AGS CAE 40 S CAE 50 NW SAV 70 ESE MCN
   55 NW CEW 35 SW SEM 15 NNW MGM.
   
   GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 30 ESE BPT 30 SE ORF
   ...CONT... 30 SE JAX 20 W CTY.
   
   --- SYNOPSIS ---
   MIDDLE-UPPER LEVEL PATTERN WILL DEAMPLIFY CROSS MOST OF CONUS THIS
   PERIOD.  THIS WILL RESULT IN NEARLY ZONAL NRN STREAM FROM PACIFIC
   NW ACROSS GREAT LAKES...AND WSWLY SRN STREAM CONTAINING RELATIVELY
   LOW-AMPLITUDE PERTURBATIONS.  POSITIVELY TILTED SHORTWAVE TROUGH --
   NOW EVIDENT IN MOISTURE CHANNEL IMAGERY FROM SRN PLAINS TO LOWER OH
   VALLEY -- IS FORECAST TO WEAKEN AND MOVE EWD WITH FURTHER
   STRETCHING OF MIDLEVEL VORTICITY PATTERN.  STRONGEST PORTION OF
   TROUGH SHOULD REACH CAROLINAS BY END OF PERIOD.  MEANWHILE...
   SURFACE FRONTAL ZONE -- NOW OVER SRN APPALACHIANS SWWD OVER NWRN
   GULF -- SHOULD MOVE EWD OFF MOST OF ATLANTIC COAST N OF FL BY
   07/12Z.  TRAILING PORTION OF FRONT BY THEN SHOULD EXTEND FROM NRN
   FL WSWWD TO OFFSHORE MS RIVER MOUTH...THEN SWWD OVER E-CENTRAL MEX.
   
   --- SERN CONUS ---
   REF WW 31 AND ASSOCIATED SPC MESOSCALE DISCUSSIONS FOR NOWCAST
   GUIDANCE REGARDING POTENTIALLY DAMAGING TSTMS NOW MOVING ACROSS
   PORTIONS ERN AL AND GA.  FAVORABLY MOIST/UNSTABLE LOW LEVEL AIR
   MASS WILL REMAIN IN PLACE SE OF FRONT THROUGHOUT DAY ACROSS SERN
   CONUS...ALONG WITH STRONG DEEP-LAYER VERTICAL SHEAR PROFILES AND
   UNIDIRECTIONAL VERTICAL PROFILES SUPPORTING DAMAGING CONVECTIVE
   GUSTS.  HOWEVER WE DO EXPECT CONVERGENCE AND OVERALL SEVERE
   POTENTIAL TO DIMINISH FROM LATE MORNING ONWARD...AS STRONGEST
   ISALLOBARIC FORCING MOVES AWAY FROM REGION...VEERING AND WEAKENING
   BOUNDARY LAYER FLOW.  FRONT ALSO WILL MOVE SEWD BENEATH WARMER
   MIDLEVEL TEMPERATURES AND REDUCED LAPSE RATES ALOFT PER 12Z WARM-
   SECTOR RAOBS.
   
   ADDITIONAL CONVECTION MAY DEVELOP N OF SURFACE FRONT TONIGHT -- AS
   LOW LEVEL MOISTENING/WAA ACT TO MARGINALLY DESTABILIZE AIR MASS
   ABOVE RELATIVELY STABLE BOUNDARY LAYER.  ELEVATED MUCAPE 100-300
   J/KG POSSIBLE...WITH LAPSE RATES TOO WEAK TO FAVOR ORGANIZED
   SEVERE.
    
   ..EDWARDS.. 03/06/03
   
   NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED FOR 1630Z
        
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