MESOSCALE DISCUSSION 1572
   NWS STORM PREDICTION CENTER NORMAN OK
   0749 PM CDT WED JUL 15 2009
   
   AREAS AFFECTED...WESTERN KY/WESTERN AND MIDDLE TN/NORTHEAST AR
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 585...586...
   
   VALID 160049Z - 160145Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   585...586...CONTINUES.
   
   SEVERE TSTM WATCHES 585/586 CONTINUE UNTIL 02Z/04Z
   RESPECTIVELY...WITH THE PRIMARY RISK OF DAMAGING WINDS. THE NEED FOR
   AN ADDITIONAL WATCH INTO MIDDLE TN AND THE REMAINDER OF SOUTHWEST KY
   IS UNCLEAR...BUT CURRENT TRENDS SUGGEST AN ADDITIONAL WATCH MAY NOT
   BE NEEDED.
   
   QUASI-LINEAR CONVECTIVE LINE WITH HISTORY OF WIND DAMAGE CONTINUES
   TO STEADILY PROGRESS EAST-SOUTHEASTWARD ACROSS FAR SOUTHWEST
   KY/WESTERN TN AS OF 0045Z...WITH ITS FORWARD MOVEMENT HAVING
   INCREASED TO 35-40 KT OVER THE PAST 1-2 HOURS. A 41 KT WIND GUST WAS
   RECENTLY MEASURED AT PADUCAH KY AS OF 0016Z. AHEAD OF THIS
   MCS...OTHER MORE DISCRETE STORMS CONTINUE TO DEVELOP/PERSIST ALONG A
   LOW LEVEL BOUNDARY ACROSS SOUTHWEST/MIDDLE TN...INCLUDING A VERY
   HEAVY RAIN/PERIODIC DAMAGING WIND PRODUCING/NEARLY STATIONARY STORM
   ALONG I-40 AROUND 65 MILES WSW OF NASHVILLE. WHILE WIND DAMAGE
   POTENTIAL COULD CONTINUE INTO MIDDLE TN/ADJACENT PORTIONS OF KY OVER
   THE NEXT FEW HOURS WITH THE MCS...AND A RATHER MOIST/UNSTABLE
   AIRMASS WAS SAMPLED BY THE 00Z NASHVILLE OBSERVED RAOB...DIURNAL
   COOLING AND THE LIKLIHOOD FOR THE MCS TO GRADUALLY ENCOUNTER A
   LOCALLY MORE STABLE AIRMASS /LARGELY OWING TO WEST-CENTRAL TN
   STATIONARY STORM/ SUGGESTS AN ADDITIONAL WATCH MAY NOT BE NEEDED
   INTO MIDDLE TN.
   
   ..GUYER.. 07/16/2009
   
   
   ATTN...WFO...LMK...OHX...PAH...MEG...
   
   LAT...LON   37558818 37498676 35868658 34988836 35359026 36228872
               37558818