MESOSCALE DISCUSSION 0893
   NWS STORM PREDICTION CENTER NORMAN OK
   1238 PM CDT FRI JUN 11 2010
   
   AREAS AFFECTED...A LARGE PORTION OF THE LWR OH/TN VALLEYS AND
   CUMBERLAND PLATEAU
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 111738Z - 111945Z
   
   THE NEED FOR WATCHES IS NOT ANTICIPATED...BUT TRENDS WILL BE
   MONITORED.
   
   ON THE NORTHWESTERN PERIPHERY OF SUBTROPICAL RIDGING...A MID/UPPER
   IMPULSE ASSOCIATED WITH REMNANTS OF A WEAK CLOSED LOW IS SLOWLY
   LIFTING NORTHEASTWARD OUT OF THE OZARK PLATEAU.  AS THIS OCCURS... A
   WEAKLY DIFLUENT AND DIVERGENT DOWNSTREAM UPPER FLOW MAY BE
   CONTRIBUTING TO ONGOING STORM DEVELOPMENT ACROSS MUCH OF THE REGION.
    MID-LEVEL TEMPERATURES ARE RATHER WARM...BUT...WITH THE EXCEPTION
   OF THE IMMEDIATE VICINITY OF THE REMNANT CIRCULATION OVER SOUTHEAST
   MISSOURI/SOUTHERN ILLINOIS AND WESTERN
   KENTUCKY/TENNESSEE...MID-LEVEL LAPSE RATES ARE STILL RELATIVELY
   STEEP ASSOCIATED WITH UNDISTURBED ELEVATED MIXED LAYER AIR EMANATING
   FROM THE PLATEAU REGION.  COUPLED WITH HIGH MOISTURE CONTENT AS
   CHARACTERIZED BY PRECIPITABLE WATER AROUND 2 INCHES...AND LOWER/MID
   70S SURFACE DEW POINTS...THE ENVIRONMENT IS PROBABLY CONDUCIVE TO
   LOCALIZED DOWNBURSTS CAPABLE OF PRODUCING POTENTIALLY DAMAGING WIND
   GUSTS.
   
   VERTICAL SHEAR IS WEAK...BUT LIFT ALONG CONSOLIDATING STORM OUTFLOWS
   MAY SUPPORT INCREASINGLY WIDESPREAD CONVECTION THROUGH 21-22Z. 
   LIGHT TO MODEST SOUTHWESTERLY DEEP LAYER MEAN FLOW SHOULD CONTRIBUTE
   TO PROPAGATION OF ACTIVITY TOWARD THE SOUTHERN GREAT LAKES REGION
   AND CENTRAL APPALACHIANS.
   
   ..KERR.. 06/11/2010
   
   
   ATTN...WFO...RLX...CLE...GSP...MRX...JKL...ILN...LMK...IWX...
   OHX...IND...HUN...PAH...LOT...ILX...LSX...DVN...
   
   LAT...LON   36748668 38738722 39048879 39659017 40909047 41918821
               40758298 38048182 35648309 35008739 36748668