MESOSCALE DISCUSSION 1093
   NWS STORM PREDICTION CENTER NORMAN OK
   1118 PM CDT FRI MAY 23 2003
   
   AREAS AFFECTED...SCNTRL/SWRN NEB AND NCNTRL/CNTRL KS
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL 
   
   VALID 240418Z - 240615Z
   
   MCS CONTINUES TO SLOWLY EVOLVE LATE THIS EVENING ACROSS CNTRL NEB. 
   TWO SUPERCELLS CONTINUE TO TRACK SWD...ONE NEAR BBW AND THE OTHER
   ABOUT 30 NW OF BBW.  OTHER TSTMS ARE BEGINNING TO BACKBUILD NW INTO
   HOOKER AND THOMAS COUNTIES AND THE ENTIRE COMPLEX IS BEGINNING TO
   INCREASE IN FORWARD SPEED...NOW 30-35 KTS.  LATEST GUIDANCE SUGGESTS
   THAT MODEST ISENTROPIC LIFT/WARM ADVECTION WILL DEVELOP DOWNSTREAM
   INTO SRN NEB INTO CNTRL KS BETWEEN 06-09 UTC AS LOW-MIDLEVEL FLOW
   TENDS TO BACK AHEAD OF UPSTREAM TROUGH... YIELDING IN A WIND FLOW
   MORE NORMAL TO NW-SE ORIENTED THETA-E AXIS.  ADDITIONAL TSTMS MAY
   FORM AHEAD OF THE NEB MCS ACROSS CNTRL KS WHERE PERSISTENT BAND OF
   ACCAS HAS BEEN OBSERVED FROM NEAR ICT-50 SW HSI ALL EVENING.
   
   FAVORABLE ELEVATED CAPE AND VERTICAL SHEAR WILL BE IN PLACE FOR
   SUPERCELLS WITH LARGE HAIL.  IT IS ALSO POSSIBLE THAT DAMAGING WINDS
   WILL BECOME MORE OF A THREAT AS THE MCS MATURES AND BEGINS TO
   INCREASE IN FORWARD SPEED INTO KS IN A FEW HOURS. 
   MOREOVER...KINEMATIC WIND SET-UP WILL PROVE FAVORABLE FOR UPSTREAM
   DEVELOPMENT OF TSTMS THAT WILL TRAIN SEWD ACROSS SRN NEB AND CNTRL
   KS POSSIBLY LEADING TO PROLONGED HEAVY RAINFALL.
   
   ANOTHER WW MAY BE ISSUED TO COVER AREAS DOWNSTREAM OF THE MCS IN KS
   IN A COUPLE OF HOURS.
   
   ..RACY.. 05/24/2003
   
   
   ATTN...WFO...GID...LBF...GLD...TOP...ICT...DDC...
   
   40330128 41920126 41729892 40119891 
   
   39959818 39069727 38309688 37849743 37879834 38659932
   39870019