MESOSCALE DISCUSSION 0763
   NWS STORM PREDICTION CENTER NORMAN OK
   0216 PM CDT FRI MAY 08 2009
   
   AREAS AFFECTED...SRN IL..SRN IND...WRN KY...SERN MO...NERN AR AND
   WRN THROUGH MIDDLE TN
   
   CONCERNING...TORNADO WATCH 267...
   
   VALID 081916Z - 082045Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 267 CONTINUES.
   
   GREATEST THREAT FOR MORE WIDESPREAD DAMAGING WIND STILL APPEARS TO
   BE ALONG LEADING GUST FRONT FROM N CNTRL TN...WRN KY INTO SWRN IND
   AS WELL AS IN COMMA HEAD REGION OVER SRN IL. THREAT FOR ISOLATED
   TORNADOES APPEARS TO BE GREATEST ACROSS MIDDLE AND PARTS OF WRN TN
   BUT CONDITIONAL UPON ADDITIONAL STORM DEVELOPMENT. LARGE HAIL AND A
   MORE ISOLATED DAMAGING WIND THREAT EXISTS FARTHER WEST ACROSS NERN
   AR INTO WRN TN.
   
   THIS AFTERNOON AN ORGANIZED MESOSCALE SYSTEM WITH A COMMA HEAD OVER
   SRN IL AND BOWING LINE FARTHER SE ACROSS WRN KY INTO NRN PORTIONS OF
   MIDDLE TN IS MOVING EAST AT AROUND 50 KT. THREAT FOR DAMAGING WIND
   WILL CONTINUE WITH THIS FEATURE NEXT FEW HOURS...ESPECIALLY WITH
   BOWING SEGMENT AS WELL AS WITHIN COMMA HEAD REGION. STORMS HAVE
   BECOME MORE DISCRETE IN NATURE ALONG SRN END OF THE LINE ACROSS
   MIDDLE TN...CONCURRENT WITH INCREASING 0-2 KM WINDS...PER 18Z BNA
   SOUNDING AND VWP DATA...ASSOCIATED WITH A NEWD DEVELOPING LOW LEVEL
   JET. THREAT FOR ISOLATED TORNADOES APPEARS GREATEST IN THIS REGION
   NEXT COUPLE HOURS. FARTHER WEST ALONG TRAILING E-W PORTION OF THE
   BOUNDARY ACROSS NERN AR...THE SWLY LOW LEVEL JET CONTINUES TO
   PROMOTE THUNDERSTORM DEVELOPMENT PRIMARILY JUST NORTH OF THE
   BOUNDARY. SWD DEVELOPMENT COULD BE LIMITED BY A CAP IN WARM SECTOR.
   HOWEVER...STORMS THAT ARE TRAINING EWD IN THIS REGION WITH HAVE THE
   POTENTIAL TO PRODUCE ISOLATED LARGE HAIL...VERY HEAVY RAIN AND
   POSSIBLE ISOLATED STRONG WIND GUSTS. THERE IS ALSO SOME CONCERN THAT
   STORMS DEVELOPING ALONG TRAILING OUTFLOW BOUNDARY COULD BECOME
   SURFACE BASED AND DEVELOP A LITTLE FARTHER SEWD...WHICH WOULD
   INCREASE THE THREAT OF DAMAGING WIND AND ISOLATED TORNADOES. THE 18Z
   RAOB FROM LIT INDICATES THE CAP HAS WEAKENED SOMEWHAT SINCE 12Z THIS
   MORNING.
   
   ..DIAL.. 05/08/2009
   
   
   ATTN...WFO...LMK...OHX...IND...PAH...MEG...LSX...LZK...SGF...
   
   LAT...LON   36758821 37278769 37678790 37658854 37718935 38468929
               38408703 36848681 35458747 35589121 36669179 36758821