MESOSCALE DISCUSSION 0757
   NWS STORM PREDICTION CENTER NORMAN OK
   0730 PM CDT TUE MAY 08 2007
   
   AREAS AFFECTED...CENTRAL/SRN OK...NCNTRL TX
   
   CONCERNING...TORNADO WATCH 259...
   
   VALID 090030Z - 090130Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 259 CONTINUES.
   
   WELL DEFINED MCV HAS EVOLVED WITHIN EXPANDING PRECIPITATION SHIELD
   INVOF WILBARGER/BAYLOR COUNTIES IN NCNTRL TX.  THIS EXPANDING MCS
   HAS BOW-LIKE CHARACTERISTICS ACROSS ARCHER/YOUNG COUNTIES WHERE
   DAMAGING WINDS ARE OCCURRING ALONG APEX OF ARCING LINE THAT IS
   SURGING NEWD AT 35-40 KT.  BACKED FLOW FARTHER NORTH INTO CNTRL OK
   APPEARS SUFFICIENT FOR WEAK SUPERCELL STRUCTURES AHEAD OF THIS
   SQUALL LINE.  CURRENT SPEED/MOVEMENT SUGGESTS LEADING EDGE OF
   STRONGEST ACTIVITY WILL MOVE EAST OF WW BY 0130Z.  NEW WATCH WILL BE
   REQUIRED DOWNSTREAM SHORTLY.
   
   ..DARROW.. 05/09/2007
   
   
   ATTN...WFO...TSA...FWD...OUN...
   
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