MESOSCALE DISCUSSION 0821
   NWS STORM PREDICTION CENTER NORMAN OK
   1213 PM CDT THU MAY 08 2008
   
   AREAS AFFECTED...E CNTRL MS INTO W CNTRL AL
   
   CONCERNING...TORNADO WATCH 277...
   
   VALID 081713Z - 081845Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 277 CONTINUES.
   
   AN ADDITIONAL WW PROBABLY WILL BE NEEDED EARLY THIS AFTERNOON.
   
   CONVECTIVE CELLS CONTINUE TO SLOWLY DEEPEN ACROSS SOUTHWEST THROUGH
   EAST CENTRAL MISSISSIPPI...ALONG/JUST AHEAD OF THE SOUTHERN FLANK OF
   ONGOING SQUALL LINE NOW ADVANCING TOWARD THE UPPER TENNESSEE VALLEY.
    THE BOUNDARY LAYER INSTABILITY IS STILL RATHER MODEST... ON THE
   ORDER OF 1000 J/KG...AND THIS...COUPLED WITH SUBSIDENCE WARMING
   ALOFT...IS SLOWING STORM INTENSIFICATION.  LATEST RUC GUIDANCE NOW
   SUGGESTS THAT INHIBITION FOR BOUNDARY LAYER PARCELS IS SMALL ACROSS
   MUCH OF CENTRAL/SOUTHERN MISSISSIPPI AND ALABAMA.  BUT...POTENTIAL
   FOR VIGOROUS STORM INITIATION SEEMS MOST PROBABLE ACROSS EAST
   CENTRAL MISSISSIPPI INTO CENTRAL ALABAMA...WHERE MID-LEVEL
   TEMPERATURES REMAIN COOLER ASSOCIATED WITH LINGERING INFLUENCE OF
   UPPER IMPULSE NOW LIFTING THROUGH KENTUCKY/TENNESSEE.  THIS STILL
   APPEARS POSSIBLE NEAR/NORTH OF MERIDIAN INTO AREAS NEAR/SOUTH OF
   TUSCALOOSA/BIRMINGHAM BY 18-19Z.  AND...WITHIN THE PRESENCE OF
   STRONG DEEP LAYER SHEAR AND LARGE CLOCKWISE CURVED LOW-LEVEL
   HODOGRAPHS NEAR A 40-50 KT LOW-LEVEL JET AXIS...THE RISK FOR
   DISCRETE SUPERCELLS WITH TORNADOES WILL INCREASE.  ISOLATED STRONG
   TORNADOES ARE POSSIBLE.
   
   ..KERR.. 05/08/2008
   
   
   ATTN...WFO...BMX...MOB...JAN...
   
   32648932 33078898 33488837 33788771 33788713 33648654
   33398646 32928685 32468749 32058867 32388925