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Jul-10-2003 1730 UTC Day 2 Convective Outlook
Categorical Graphic
1730 UTC Day 2 Outlook Graphic
      
 
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1730 Day 2 Prob Graphic
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   STORM PREDICTION CENTER...NWS/NCEP...NORMAN OK 
   DAY 2 CONVECTIVE OUTLOOK...REF AWIPS GRAPHIC PGWI47 KWNS.
   
   VALID 111200Z - 121200Z
   
   THERE IS A SLGT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM
   35 S ILM 15 ESE RDU 25 SSW DCA 20 W PSF 30 WSW EEN 25 SSE PSM.
   
   THERE IS A SLGT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM
   10 ESE P28 40 E LAA 25 WSW LIC 25 SW CYS 10 W BFF 50 S EAR
   10 NW TOP 35 S SZL 10 E UMN 10 ESE P28.
   
   GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 45 WSW FHU
   25 SSW GUP 15 ENE GUC RWL 55 SSW COD 50 SW BIL 45 N SHR 55 SSE 81V
   50 NW MHN 25 SE BBW 25 SW LNK 35 NNE SZL 65 SSW CKV 20 S BWG
   40 WSW BRL 50 S FAR 60 N DVL ...CONT... 20 E PSX 15 S NIR
   20 WSW LRD.
   
   ...SYNOPSIS...
   MID-LEVEL LOW INITIALLY OVER THE GREAT LAKES IS FORECAST TO OPEN
   AND LIFT NEWD INTO QUEBEC IN RESPONSE TO MID AND UPPER-LEVEL JET
   STREAKS TRANSLATING OUT OF THE MEAN TROUGH BASE AND INTO NEW
   ENGLAND. ELSEWHERE...A BROAD AREA OF MODESTLY STRONG CYCLONIC MID-
   LEVEL FLOW WILL PERSIST FROM THE NRN/CNTRL PLAINS SEWD THROUGH THE
   OH/TN VALLEYS INTO THE MIDDLE ATLANTIC STATES. IN THE LOW LEVELS...
   OCCLUDED SURFACE CYCLONE WILL EXIST OVER SERN ONTARIO BY LATE
   AFTERNOON WITH ASSOCIATED FRONTAL SYSTEM EXTENDING FROM SRN NEW
   ENGLAND SWD ALONG THE MIDDLE ATLANTIC COAST AND THEN WWD ACROSS THE
   GULF COAST INTO CNTRL TX. IN ADDITION...A SECONDARY BAROCLINIC ZONE
   IS FORECAST TO STRENGTHEN THROUGH THE LATTER HALF OF THE PERIOD
   FROM THE CNTRL ROCKIES SEWD INTO MIDDLE MS VALLEY.
   
   ...MIDDLE ATLANTIC STATES NWD INTO SRN NEW ENGLAND...
   SCATTERED TSTMS MAY BE ONGOING INITIALLY ALONG AND AHEAD OF SURFACE
   FRONT FROM ERN PA/NJ NWD INTO NEW ENGLAND. FRONTAL CONVERGENCE AND
   LOW-LEVEL WAA ACROSS THE WARM SECTOR SHOULD SUSTAIN THESE STORMS
   THROUGH THE MORNING INTO AFTERNOON NEWD ACROSS MUCH OF NEW
   ENGLAND...EFFECTIVELY LIMITING AIR MASS DESTABILIZATION. FARTHER
   S...BREAKS IN THE CLOUDS/INCREASED DIABATIC HEATING COUPLED WITH
   SURFACE DEWPOINTS IN THE UPPER 60S TO MID 70S WILL CONTRIBUTE TO A
   MODERATELY UNSTABLE AIR MASS WITH MLCAPES OF 1500-2500 J/KG AHEAD
   OF SURFACE COLD FRONT.
   
   FORCING FOR ASCENT AHEAD OF MID-LEVEL TROUGH IN CONJUNCTION WITH
   LOW-LEVEL FRONTAL CONVERGENCE SHOULD BE SUFFICIENT TO INITIATE
   VIGOROUS DEEP...MOIST CONVECTION BY EARLY AFTERNOON ACROSS THE
   SLIGHT RISK AREA. ETAKF FORECAST SOUNDINGS INDICATE UNIDIRECTIONAL
   WIND PROFILES WITH SUFFICIENT SPEED SHEAR TO SUPPORT ORGANIZED
   STORM CLUSTERS/LINES. GIVEN THE RELATIVELY HIGH WET-BULB ZERO
   HEIGHTS/FREEZING LEVELS...IT APPEARS THAT DAMAGING WINDS WILL BE
   THE PRIMARY SEVERE WEATHER THREAT WITH ANY EMBEDDED SMALL BOWING
   SEGMENTS.
     
   ...CNTRL PLAINS...
   DEEPENING LOW PRESSURE OVER SERN CO/SWRN KS SHOULD ENHANCE THE
   ADVECTION OF POST-FRONTAL...BOUNDARY-LAYER MOISTURE NWD/NWWD ACROSS
   KS INTO ERN CO/FAR SWRN NEB DURING THE DAY. THIS INCREASE IN
   MOISTURE BENEATH STEEP MID-LEVEL LAPSE RATES /7.5-8.5 C/KM/ WILL
   CONTRIBUTE TO MODERATE INSTABILITY WITH AFTERNOON MLCAPES OF 1000-
   1500 J/KG.
   
   DAYTIME HEATING AND LOW-LEVEL UPSLOPE WIND COMPONENT MAY ALLOW
   ISOLATED TSTMS TO DEVELOP BY LATE AFTERNOON/EARLY EVENING ALONG THE
   HIGHER TERRAIN OF NERN CO/SERN WY. THE PRESENCE OF 30-40KT NWLY
   MID-LEVEL WINDS ABOVE LOW-LEVEL SELY FLOW WILL RESULT IN 40-50KTS
   OF 0-6KM AGL SHEAR. THUS...IT APPEARS THAT A FEW SUPERCELLS WILL BE
   POSSIBLE WITH LARGE HAIL BEING THE PRIMARY SEVERE WEATHER THREAT. 
   
   ADDITIONAL TSTMS ARE EXPECTED TO DEVELOP LATE FRIDAY EVENING INTO
   FRIDAY NIGHT FARTHER SE ACROSS KS. HERE...A STRENGTHENING LLJ
   SHOULD ENHANCE LOW-LEVEL WAA/ISENTROPIC ASCENT ALONG AND N OF A
   SURFACE BOUNDARY WHICH SHOULD EXIST FROM E-CNTRL CO INTO SERN MO. 
   MODEST AMOUNTS OF ELEVATED INSTABILITY AND DEEP-LAYER SHEAR SUGGEST
   THE POTENTIAL FOR LARGE HAIL/DAMAGING WINDS WITH THE STRONGEST
   STORMS.  
   
   ...SERN U.S. WWD ACROSS THE GULF COAST INTO TX...
   A LARGE POOL OF SURFACE DEWPOINTS IN THE 70S IS EXPECTED TO PERSIST
   TO THE S OF FRONTAL BOUNDARY WHICH WILL SLOWLY MOVE S/SEWD THROUGH
   THE REGION. DAYTIME HEATING IN COMBINATION WITH THIS RICH LOW-LEVEL
   AIR MASS WILL ONCE AGAIN CONTRIBUTE TO AFTERNOON MLCAPES
   APPROACHING 2500-3500 J/KG. TSTMS ARE EXPECTED TO DEVELOP ALONG THE
   FRONT FAIRLY EARLY IN THE PERIOD WITH ADDITIONAL DEVELOPMENT
   EXPECTED ACROSS THE WARM SECTOR BY EARLY AFTERNOON. WEAK LOW-LEVEL
   CONVERGENCE/MID-LEVEL FLOW SUGGEST THAT THE MAJORITY OF ACTIVITY
   SHOULD REMAIN SUB-SEVERE. HOWEVER...ISOLATED DAMAGING WIND GUSTS
   WILL BE POSSIBLE WITH TSTM CLUSTERS THAT CAN ORGANIZE COLD POOLS. 
    
   ..MEAD.. 07/10/03
   
   NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED FOR 0800Z
        
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