MESOSCALE DISCUSSION 0984
   NWS STORM PREDICTION CENTER NORMAN OK
   0357 AM CDT FRI MAY 26 2006
   
   AREAS AFFECTED...PORTIONS SRN TN...EXTREME NRN AL...EXTREME
   N-CENTRAL/NERN MS.
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 401...
   
   VALID 260857Z - 261030Z
   
   BULK OF REMAINDER OF WW MAY BE ALLOWED TO EXPIRE AS SCHEDULED AT
   10Z...WITH 1-2 HOUR LOCAL EXTENSION OPTION AVAILABLE IF NECESSARY. 
   TSTMS ARE EVIDENT ALONG/BEHIND MUCH OF OUTFLOW BOUNDARY THAT IS
   MOVING SEWD/SWD THROUGH AREA BETWEEN CHA-CSV...AND ACROSS NRN AL AND
   SWRN TN.  IR CLOUD TOPS HAVE WARMED AND REFLECTIVELY HAS WEAKENED
   OVERALL WITH  MOST OF THIS ACTIVITY...EXCEPT FOR STRONG-SEVERE LINE
   SEGMENT NOW MOVING SSEWD ACROSS SWRN TN TOWARD MS BORDER.  THIS
   ACTIVITY HAS BEST ACCESS TO WLY 20-30 KT LLJ AND ASSOCIATED PLUME OF
   MOISTURE TRANSPORT AND LOW LEVEL WAA.  EXPECT ISOLATED LARGE HAIL
   AND GUSTS NEAR SEVERE LEVELS AS THIS CONVECTION MOVES BASICALLY
   SWD...WHEN COMBINING SEWD TRANSLATIONAL AND SWWD PROPAGATIONAL MCS
   MOTION VECTOR COMPONENTS.  HOWEVER...ORGANIZATION WILL BE
   LIMITED...WITH DEEP-LAYER SHEAR AND ELEVATED MUCAPE DIMINISHING 
   WITH SWD EXTENT THROUGH NRN/CENTRAL MS.
   
   ..EDWARDS.. 05/26/2006
   
   
   ATTN...WFO...MRX...FFC...OHX...HUN...MEG...
   
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