MESOSCALE DISCUSSION 1381
   NWS STORM PREDICTION CENTER NORMAN OK
   1227 PM CDT WED JUL 04 2007
   
   AREAS AFFECTED...FAR ERN MO...SRN IL...WRN AND NRN KY...SRN IN...SRN
   OH...WV...SWRN PA
   
   CONCERNING...SEVERE POTENTIAL...WATCH LIKELY 
   
   VALID 041727Z - 041830Z
   
   THUNDERSTORMS ARE EXPECTED TO INCREASE ACROSS PORTIONS ERN MO... SRN
   IL...NRN/WRN KY...SWRN IN...SRN OH...WV AND SWRN PA THROUGH THE
   AFTERNOON. WW/S LIKELY WILL BE NEEDED SOON.
   
   AT 1715Z...AN OUTFLOW BOUNDARY...GENERATED BY EARLIER CONVECTION IN
   NRN MO...STRETCHED FROM SOUTH OF SPI WWD TO NORTH OF STL TO NEAR
   SZL. SATELLITE IMAGERY INDICATES TOWERING CU/CBS HAVE RECENTLY
   DEVELOPED ALONG AND AHEAD OF THIS BOUNDARY. THE AIR MASS IS
   MODERATELY UNSTABLE...MLCAPES APPROACHING 2000 J/KG...AND DEEP LAYER
   SHEAR IS SUFFICIENT FOR SEVERE STORMS ALONG AND AHEAD OF THE ESEWD
   MOVING OUTFLOW BOUNDARY.
   
   ALSO...THUNDERSTORMS ARE DEVELOPING IN SERN INDIANA AND FAR WRN
   OH...AHEAD OF AN MCV LOCATED IN CENTRAL INDIANA. THE STORMS IN
   ASSOCIATION WITH THIS SYSTEM HAVE THUS FAR BEEN SLOW TO INTENSIFY
   ...BUT WITH STRENGTHENING INSTABILITY/HEATING...CONDITIONS ARE
   BECOMING MORE FAVORABLE FOR SEVERE STORMS ACROSS SRN OH...WV...NRN
   KY AND POSSIBLY EXTREME SWRN PA.
   
   ..IMY.. 07/04/2007
   
   
   ATTN...WFO...PBZ...RLX...JKL...ILN...LMK...IND...PAH...ILX...LSX...
   
   37108892 37639030 37909064 38419091 38879092 39159000
   38648648 39928431 40198008 38638029 36848674 36968814