MESOSCALE DISCUSSION 0309
   NWS STORM PREDICTION CENTER NORMAN OK
   1151 PM CDT FRI MAR 27 2009
   
   AREAS AFFECTED...CNTRL AND SRN AL...FAR SRN MS
   
   CONCERNING...TORNADO WATCH 84...
   
   VALID 280451Z - 280615Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 84 CONTINUES.
   
   A LARGE CONVECTIVE CLUSTER CURRENTLY LOCATED ACROSS THE WRN AND
   CNTRL PARTS OF WW 84 WILL CONTINUE TO HAVE A SEVERE THREAT OVER THE
   NEXT FEW HOURS. THE TORNADO AND WIND DAMAGE THREATS MAY INCREASE
   ESPECIALLY ACROSS SW AL AFTER MIDNIGHT.
   
   THE LATEST RUC ANALYSIS SHOWS A LOW-LEVEL JET RAPIDLY INCREASING
   ACROSS SCNTRL AND CNTRL MS. THIS FEATURE WILL DRIFT EWD INTO SW AL
   DURING THE OVERNIGHT PERIOD STRENGTHENING WARM
   ADVECTION...INSTABILITY AND LOW-LEVEL SHEAR ACROSS MUCH OF WW 84. IN
   RESPONSE...THE TORNADO AND WIND DAMAGE THREATS SHOULD INCREASE AS
   SEVERAL CLUSTERS OF STRONG TO SEVERE THUNDERSTORMS APPROACH AND MOVE
   INTO THE WRN EDGE OF THE WATCH. WIND DAMAGE WILL BE MOST LIKELY WITH
   BOWING LINE-SEGMENTS ESPECIALLY IF A SQUALL-LINE CAN ORGANIZE AND
   MOVE INTO THE WATCH AS IS SUGGESTED BY SEVERAL MODEL FORECASTS. THE
   SEVERE THREAT SHOULD ALSO INCREASE EWD INTO PARTS OF SCNTRL AL AND
   THE WRN FL PANHANDLE LATE IN THE WATCH VALID PERIOD.
   
   ..BROYLES.. 03/28/2009
   
   
   ATTN...WFO...TAE...BMX...MOB...JAN...LIX...
   
   LAT...LON   28698898 28848931 29148926 29258905 29428957 29848937
               30008963 30258973 30618959 30668934 30918930 30938909
               31418911 31448894 31818891 31898846 32988839 33008822
               33178785 33038783 33008739 32888742 32868702 32658697
               32648664 32728644 32818641 32758590 32478588 32468596
               32408604 32278596 32058600 31978618 31808621 31788610
               31028619 31018636 30528637 30528617 30418611 30418628
               30388644 30078644 29898795 29868849 29608857 29398875
               29148867 28918874 28698898