MESOSCALE DISCUSSION 1315
   NWS STORM PREDICTION CENTER NORMAN OK
   0853 AM CDT MON JUN 20 2011
   
   AREAS AFFECTED...SOUTHERN INDIANA AND WESTERN/SOUTHERN OH TO
   SOUTHERN APPALACHIANS VICINITY
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 201353Z - 201530Z
   
   SEVERAL QUASI-LINEAR CLUSTERS /WITH SOME EMBEDDED AND OCCASIONAL
   BOWING/ WILL CONTINUE TO OCCUR WITHIN A CORRIDOR FROM
   SOUTHERN/EASTERN INDIANA AND WESTERN/SOUTHERN OH SOUTHEASTWARD INTO
   EASTERN KY/WESTERN WV AND THE SOUTHERN APPALACHIANS VICINITY. IF AN
   UPSWING IN CONVECTIVE TRENDS CONTINUE...ONE OR MORE WATCHES MAY BE
   NEEDED THIS MORNING.
   
   AFOREMENTIONED STRONG/SEVERE INITIALLY ELEVATED LINEAR-TYPE CLUSTERS
   ARE OCCURRING ALONG AN EFFECTIVE FRONTAL BOUNDARY/EDGE OF THE
   INSTABILITY GRADIENT WITH A WEST-SOUTHWESTERLY LOW LEVEL FEED OF
   INSTABILITY AS PER REGIONAL WSR-88D VWPS AND 12Z OBSERVED RAOBS FROM
   NASHVILLE TN/LINCOLN IL/WILMINGTON OH. WHILE GRADUAL SHORTWAVE
   RIDGING WILL TEND TO OCCUR WITH TIME AND THE BOUNDARY LAYER IS NOT
   INITIALLY VERY UNSTABLE/CONSIDERABLE CLOUD COVER EXISTS...THE
   POTENTIAL FOR FURTHER COLD POOL EXPANSION/UPSCALE GROWTH AND GRADUAL
   DIURNAL WARMING MAY SUPPORT AN INCREASING DAMAGING WIND POTENTIAL
   THROUGH LATE MORNING/EARLY AFTERNOON...WITH SOME SEVERE HAIL
   POSSIBLE AS WELL.
   
   ..GUYER.. 06/20/2011
   
   
   ATTN...WFO...RLX...GSP...MRX...JKL...ILN...LMK...IND...
   
   LAT...LON   39738672 40288581 40018395 39738343 38638290 36968217
               35828194 35828269 36438395 38318552 39738672