MESOSCALE DISCUSSION 1332
   NWS STORM PREDICTION CENTER NORMAN OK
   0604 PM CDT WED JUN 11 2003
   
   AREAS AFFECTED...S-CNTRL/SERN SD SWD INTO N-CNTRL/NERN NEB
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL 
   
   VALID 112304Z - 120030Z
   
   TSTMS ARE DEVELOPING ON ERN EDGE OF WW513. A NEW WW WILL LIKELY BE
   REQUIRED TO THE E.
   
   SATELLITE/REGIONAL RADAR DATA INDICATE TSTMS DEVELOPING FROM
   HUGHES/STANLEY/JONES COUNTIES IN S-CNTRL SD SWD INTO BROWN/ROCK
   COUNTIES IN N-CNTRL NEB. THE NRN STORMS ARE DEVELOPING IN A ZONE OF
   INCREASED LOW-LEVEL CONVERGENCE E OF SURFACE LOW...WHEREAS THE SRN
   ACTIVITY APPEARS TO BE DEVELOPING ON A WEAK CONVERGENCE ZONE E OF
   PRIMARY SURFACE TROUGH...PER NORTH PLATTE RADAR IMAGERY. THESE
   STORMS ARE DEVELOPING ALONG N-S INSTABILITY AXIS WHERE MLCAPES HAVE
   INCREASED TO 1500-2000 J/KG. MODEST WLY MID-LEVEL FLOW /30-35KTS AT
   500MB/ ABOVE LOW-LEVEL SELY WINDS IS RESULTING IN 35-45KTS OF 0-6KM
   AGL SHEAR. THUS...IT APPEARS THAT THE DEVELOPING TSTMS WILL HAVE THE
   POTENTIAL TO EVOLVE INTO SUPERCELLS GIVEN THE FAVORABLE
   ENVIRONMENTAL CONDITIONS. ALTHOUGH DAMAGING WINDS AND LARGE HAIL
   WILL BE THE PRIMARY THREATS...THE BACKED NATURE OF SURFACE WINDS IS
   CONTRIBUTING TO 0-1KM SRH VALUES OF AROUND 100 M2/S2 IN AN AREA OF
   MODERATELY LOW LCL/LFC HEIGHTS. THERFORE...AN ISOLATED TORNADO OR
   TWO WILL ALSO BE POSSIBLE.
   
   WW WILL LIKELY BE ISSUED SOON.
   
   ..MEAD.. 06/11/2003
   
   
   ATTN...WFO...FSD...OAX...ABR...GID...LBF...UNR...
   
   42199939 43619972 44389988 44589990 44529866 44459776
   42889741 41329716 41119777 41069909 41589927