MESOSCALE DISCUSSION 1378
   NWS STORM PREDICTION CENTER NORMAN OK
   0644 PM CDT FRI JUN 13 2003
   
   AREAS AFFECTED...CNTRL AND ERN OK
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL 
   
   VALID 132344Z - 140115Z
   
   TSTMS ARE BEGINNING TO DEVELOP ACROSS THE AREA. CONVECTIVE TRENDS
   WILL BE MONITORED FOR A POSSIBLE WW.
   
   MESONET DATA AND TWIN LAKES RADAR IMAGERY SHOW SURFACE BOUNDARY
   CURRENTLY EXTENDING FROM WASHITA COUNTY EWD THROUGH CLEVELAND COUNTY
   AND INTO MCINTOSH...MUSKOGEE AND SEQUOYAH COUNTIES IN ERN OK.
   ALTHOUGH INSOLATION HAS BEEN LIMITED THROUGH MUCH OF THE AFTERNOON
   BY HIGH CLOUDINESS...DEWPOINTS OF 65-70 AND STEEP MID-LEVEL LAPSE
   RATES ARE CONTRIBUTING TO A MODERATELY UNSTABLE AIRMASS WITH MLCAPES
   OF 1000-2000 J/KG.
   
   PURCELL OK PROFILER INDICATES WEAK WINDS THROUGH THE LOWEST 9
   KM...SUGGESTING THAT DEVELOPING TSTMS SHOULD REMAIN RELATIVELY
   DISORGANIZED. NONETHELESS...AS LARGE-SCALE FORCING AHEAD OF
   SHORTWAVE TROUGH OVER WRN TX/TX PNHDL MOVES EWD...TSTMS SHOULD
   INCREASE IN COVERAGE. ISOLATED LARGE HAIL/DAMAGING WINDS WILL BE
   POSSIBLE WITH THE STRONGEST STORMS. CONVECTIVE TRENDS WILL BE
   MONITORED FOR A POSSIBLE WW.
   
   ..MEAD.. 06/13/2003
   
   
   ATTN...WFO...TSA...OUN...
   
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