MESOSCALE DISCUSSION 1634
   NWS STORM PREDICTION CENTER NORMAN OK
   0642 PM CDT SAT JUL 05 2003
   
   AREAS AFFECTED...EXTREME SRN SD AND CNTRL/NRN NEB
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 645...
   
   VALID 052342Z - 060115Z
   
   TSTM CLUSTER CONTINUES TO EVOLVE OVER SRN SD AND EXTREME NCNTRL NEB.
    LEAD SUPERCELL OVER CHERRY COUNTY NEB HAS APPEARED TO LATCH ONTO
   NW-SE ORIENTED BOUNDARY THAT EXTENDS TOWARD OMA.  CURRENT
   INDICATIONS THAT SRN PART OF MCS WILL CONTINUE TO DEVELOP/MOVE SEWD
   ALONG INSTABILITY AXIS/BOUNDARY INTO CNTRL/NERN NEB.  NEAR STORM
   ENVIRONMENT IS CHARACTERIZED BY RATHER HIGH DEW POINT
   DEPRESSION...BUT AIR MASS IN CNTRL/ERN NEB IS MORE MOIST WITH E-SELY
   LOW LEVEL FLOW BENEATH VERTICAL SHEAR 60-65 KTS.  THEREFORE...AREA
   FROM VTN-ODX-OFK WILL HAVE TO MONITORED FOR AN INCREASING TORNADO
   THREAT.  OTHERWISE...LARGE HAIL AND DAMAGING WINDS WILL REMAIN A
   POSSIBILITY THROUGH THE EVENING.
   
   ..RACY.. 07/05/2003
   
   
   ATTN...WFO...FSD...OAX...GID...LBF...UNR...
   
   40740102 43410279 43439661 40729509