MESOSCALE DISCUSSION 1081
   NWS STORM PREDICTION CENTER NORMAN OK
   0524 PM CDT FRI JUN 12 2009
   
   AREAS AFFECTED...EASTERN AR AND WESTERN/MIDDLE TN AND NORTHERN
   PORTIONS MS/AL INTO GA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 388...389...
   
   VALID 122224Z - 130000Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   388...389...CONTINUES.
   
   PDS SEVERE TSTM WATCH 388 CONTINUES UNTIL 00Z AND SEVERE TSTM WATCH
   389 CONTINUES UNTIL 03Z ACROSS NORTHERN AL. ADJACENT TO THESE
   EXISTING WATCHES...PORTIONS OF MIDDLE TN AND NORTHERN GA WILL BE
   MONITORED FOR ADDITIONAL WATCHES THIS EVENING.
   
   DERECHO PRODUCING BOW ECHO CONTINUES TO RACE EAST-SOUTHEASTWARD INTO
   SOUTHWEST TN AND NORTHERN MS AS OF 22Z WITH FORWARD PROGRESS AT
   AROUND 50-55 KT. THIS SEVERE MCS/BOW ECHO WILL REMAIN CAPABLE OF
   WIDESPREAD WIND DAMAGE OVER THE NEXT SEVERAL HOURS...AS IT
   CONTINUALLY ENGULFS LEADING QUASI-DISCRETE SEVERE CONVECTION
   /CAPABLE OF HAIL AND DAMAGING WINDS/ ACROSS NORTHEAST MS/NORTHERN AL
   ALONG A WNW-ESE ORIENTED LOW LEVEL BAROCLINIC ZONE. A 46 KT WIND
   GUST WAS RECENTLY MEASURED AT MEMPHIS AS OF 2146Z. A STRONG SURFACE
   COLD POOL AND A 50-65 KT REAR INFLOW JET /AROUND 2-3 KM AND ABOVE
   PER LITTLE ROCK WSR-88D VWP DATA/...ALONG WITH A MODERATELY UNSTABLE
   PRE-MCS AIRMASS WITH 2000-3500 J PER KG MLCAPE...WILL SUPPORT MCS
   MAINTENENCE WITH WIDESPREAD DAMAGING WIND POTENTIAL CONTINUING
   ACROSS NORTHERN PORTIONS OF MS/AL AND SOUTHERN TN. IN ADDITION...A
   TORNADO OR TWO CANNOT BE RULED OUT...MAINLY WITH NORTHERN PERIPHERY
   EMBEDDED CIRCULATIONS. OTHERWISE...EVEN IN THE WAKE OF THE SEVERE
   MCS...ISOLATED SEVERE REDEVELOPMENT /MAINLY HAIL/ CANNOT BE RULED
   OUT ALONG THE TRAILING OUTFLOW BOUNDARY ACROSS SOUTHERN AR AMIDST A
   WEAK ISENTROPIC LIFT REGIME ALONG/ATOP THE BOUNDARY/COLD POOL.
   
   ..GUYER.. 06/12/2009
   
   
   ATTN...WFO...MRX...FFC...OHX...BMX...HUN...MEG...JAN...LZK...
   
   LAT...LON   36049098 35948939 35428724 34838428 33728344 32618442
               32618722 32778865 33469218 34969112 36049098