MESOSCALE DISCUSSION 0850
   NWS STORM PREDICTION CENTER NORMAN OK
   1249 PM CDT THU MAY 08 2003
   
   AREAS AFFECTED...WRN OK...SRN KS
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL 
   
   VALID 081749Z - 082045Z
   
   ...THUNDERSTORMS MAY DEVELOP EARLIER THAN EXPECTED ALONG DRY LINE
   ACROSS OK AND PORTIONS OF KS.  TORNADO WATCH MAY BE REQUIRED IN THE
   NEXT 1-2 HOURS..
   
   BOUNDARY LAYER CU FIELD IS EXPANDING/DEEPENING RAPIDLY AHEAD OF DRY
   LINE FROM SWRN OK...NEWD INTO SOUTH CENTRAL KS.  THIS DEVELOPMENT IS
   OCCURRING WITHIN VERY MOIST/UNSTABLE AIR MASS WHERE SFC BASED CAPE
   VALUES ARE IN EXCESS OF 4500 J/KG AND DEEP LAYER SHEAR ON THE ORDER
   OF 40-50KT.  THUNDERSTORMS MAY DEVELOP MUCH QUICKER ALONG THE DRY
   LINE THAN EARLIER THOUGHTS OF DELAYED INITIATION.  TORNADO WATCH MAY
   BE REQUIRED IF CONVECTION CONTINUES TO DEEPEN.
   
   ..DARROW.. 05/08/2003
   
   
   ATTN...WFO...ICT...OUN...
   
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