MESOSCALE DISCUSSION 0262
   NWS STORM PREDICTION CENTER NORMAN OK
   0606 PM CST SUN FEB 17 2008
   
   AREAS AFFECTED...PORTIONS OH
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 180006Z - 180130Z
   
   BROKEN BAND OF LOW-TOPPED CONVECTION -- INCLUDING A FEW STG-SVR
   TSTMS -- MAY PRODUCE HAIL AND GUSTS APCHG 50 KT SVR CRITERIA FOR
   ANOTHER COUPLE HOURS.  41 KT GUST WAS MEASURED AT FFO AT 2325Z. 
   DURATION/COVERAGE OF THREAT APPEARS TOO SMALL FOR WW.  BRIEF TORNADO
   CANNOT BE RULED OUT...AMIDST VERY STRONG AMBIENT/DEEP-LAYER SHEAR
   PROFILES WITH 0-6 KM SHEAR 70-80 KT.
   
   ONE TSTM WITHIN THIS LINE HAS EVOLVED QUICKLY INTO A MINI-SUPERCELL
   AND MAY PERSIST NEWD TOWARD MFD AREA BEFORE DISSIPATING.  AIR MASS
   ACROSS THIS REGION APPEARS WEAKLY UNSTABLE WITH MUCAPES GENERALLY
   AOB 300 J/KG...ROOTED MOSTLY ABOVE GROUND LEVEL.  ALTHOUGH MODIFIED
   RUC SOUNDINGS INDICATE EFFECTIVE INFLOW PARCELS ARE ROOTED ABOVE
   SFC...NEAR NEUTRAL INSTABILITY IN BOUNDARY LAYER MAY NOT PRECLUDE
   VERTICAL PRESSURE GRADIENT FORCES IN INDIVIDUAL/ROTATING TSTMS FROM
   FORCING SURFACE AIR UPWARD FOR SHORT PERIODS.  PRIND THREAT WILL
   DIMINISH CONSIDERABLY AFTER 0100Z...WHEN SFC DIABATIC COOLING
   FURTHER STABILIZES LOWEST PORTION OF THERMODYNAMIC PROFILE.
   
   ..EDWARDS.. 02/18/2008
   
   
   ATTN...WFO...CLE...ILN...
   
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