MESOSCALE DISCUSSION 1060
   NWS STORM PREDICTION CENTER NORMAN OK
   0602 PM CDT THU JUN 11 2009
   
   AREAS AFFECTED...LOWER OH RIVER TO MID-MS RIVER VALLEYS
   
   CONCERNING...TORNADO WATCH 381...
   
   VALID 112302Z - 120000Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 381 CONTINUES.
   
   PRIMARY SEVERE THREAT SHOULD REMAIN WITH CONVECTIVE CLUSTER EVOLVING
   INTO NRN/WRN KY WITHIN WW 381. MORE ISOLATED SEVERE POTENTIAL SHOULD
   EXTEND FARTHER SWWD TOWARDS NERN AR/WRN TN. UNCERTAINTY IS RATHER
   HIGH WITH THE EXTENT OF THIS THREAT SW OF WW 381 AND THUS
   OBSERVATIONAL TRENDS WILL BE CLOSELY MONITORED FOR THE POSSIBILITY
   OF AN ADDITIONAL WW.
   
   CONSOLIDATION AND UPSCALE GROWTH OF NUMEROUS CONVECTIVE CELLS HAD
   RECENTLY COMMENCED ALONG AND JUST S OF THE OH RIVER IN PORTIONS OF
   NRN/WRN KY. ALTHOUGH THIS MAY TEND TO FAVOR A TRANSITION TO MORE OF
   A DAMAGING WIND THREAT...MODERATELY STRONG DEEP-LAYER SHEAR WILL
   CONTINUE TO FAVOR LARGE HAIL AND ISOLATED TORNADOES WITH EMBEDDED
   SUPERCELL STRUCTURES. FARTHER SW...A FEW CELLS HAD DEVELOPED ALONG
   SYNOPTIC BOUNDARY THAT EXTENDED INTO SRN MO/NRN AR. GIVEN THE
   JUXTAPOSITION OF STRONG INSTABILITY WITH FAVORABLE DEEP-LAYER
   SHEAR...THESE TSTMS WOULD ALSO POSE A THREAT FOR SEVERE HAIL/WINDS.
   HOWEVER...OVERALL CONVECTIVE COVERAGE AND SUSTENANCE OF TSTMS BEYOND
   THE NEXT 1-2 HRS IS QUESTIONABLE AS THIS REGION LIKELY WILL LIE IN
   SUBSIDENCE IN THE WAKE OF SHORT WAVE IMPULSE EJECTING EWD ALONG THE
   OH RIVER VALLEY.
   
   ..GRAMS.. 06/11/2009
   
   
   ATTN...WFO...MRX...JKL...LMK...OHX...PAH...MEG...LZK...
   
   LAT...LON   37748510 37428434 36828428 36568456 36468542 36328746
               35538909 35259037 35729120 36229120 36919043 37538847
               37838679 37748510