MESOSCALE DISCUSSION 0553
   NWS STORM PREDICTION CENTER NORMAN OK
   0755 AM CDT FRI APR 04 2008
   
   AREAS AFFECTED...NORTHEAST LA AND NORTHERN/CENTRAL PORTIONS OF MS/AL
   INTO EASTERN TN
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 161...162...
   
   VALID 041255Z - 041500Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   161...162...CONTINUES.
   
   VALID PORTION OF SEVERE THUNDERSTORM WATCHES 161/162 CONTINUE UNTIL
   16Z...WITH A CONTINUED RISK FOR ISOLATED DAMAGING WIND GUSTS AND
   LARGE HAIL. SOUTH/EAST OF WATCHES 161/162...AN ADDITIONAL WATCH MAY
   BE NEEDED BY MID MORNING OR SO...ESPECIALLY ACROSS NORTHEAST
   LA/CENTRAL MS INTO NORTHERN/CENTRAL AL.
   
   PRE-COLD FRONTAL STRONG/OCCASIONALLY SEVERE BROKEN CONVECTIVE LINE
   CONTINUES TO ADVANCE EASTWARD ACROSS EAST CENTRAL TN/FAR NORTHWEST
   AL AND NORTHERN MS TO NEAR AND SOUTH OF THE AR/LA BORDER AS OF
   1245Z. IN ADDITION...SATELLITE/RADAR TRENDS REFLECT A GRADUAL
   DEEPENING OF WARM ADVECTION SHOWERS AHEAD OF THE LINE ACROSS
   NORTHERN/CENTRAL LA INTO NORTH CENTRAL MS. IT APPEARS LIKELY THE
   EXISTING LINE WILL BECOME INCREASINGLY SURFACE BASED THROUGH THE
   MORNING OWING TO INSOLATION/HEATING...WHILE QUASI-DISCRETE
   PRE-LINEAR DEVELOPMENT MAY OCCUR AS WELL. 12Z OBSERVED RAOB FROM
   SHREVEPORT LA REFLECTS ONLY A WEAKLY CAPPED AIRMASS. MODIFIED 12Z
   SOUNDINGS FROM SHREVEPORT/JACKSON/BIRMINGHAM...IN CONJUNCTION WITH
   LATEST RUC GUIDANCE...SUGGEST THE DEVELOPMENT OF 1000-2000 J/KG
   MLCAPE IN A CORRIDOR FROM NORTHERN LA INTO CENTRAL AL BY MID/LATE
   MORNING. GIVEN THE WEAK CAPPING AND EFFECTIVE SHEAR OF 40 KT OR
   GREATER WITH THE WARM SECTOR...SUPERCELLS AHEAD OF THE LINE WILL
   BECOME A DISTINCT POSSIBILITY LATER THIS MORNING...WITH THE
   CONVECTIVE LINE OTHERWISE POSING A RISK OF DAMAGING WINDS/SOME HAIL.
   
   ..GUYER.. 04/04/2008
   
   
   ATTN...WFO...MRX...FFC...OHX...BMX...HUN...MEG...JAN...LZK...SHV...
   
   35888613 35458503 32578759 31649246 33089270 34258911