MESOSCALE DISCUSSION 1297
   NWS STORM PREDICTION CENTER NORMAN OK
   0954 PM CDT TUE JUN 23 2009
   
   AREAS AFFECTED...WRN NEB
   
   CONCERNING...TORNADO WATCH 504...
   
   VALID 240254Z - 240430Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 504 CONTINUES.
   
   THROUGH AN ISOLATED BRIEF TORNADO REMAINS POSSIBLE...PRIMARY THREAT
   IS TRANSITIONING TO DAMAGING WIND AND HAIL.
   
   STORMS ARE INCREASING IN COVERAGE OVER WRN NEB WITHIN ZONE OF
   ISENTROPIC LIFT NORTH OF QUASISTATIONARY FRONT. OTHER STORMS ARE
   SPREADING EWD OUT OF FAR WRN NEB AND NERN CO. NUMEROUS STORM MERGERS
   ARE LIKELY WITHIN THE NEXT HOUR OR TWO...AND THIS SHOULD RESULT IN
   STORMS EVOLVING INTO CLUSTERS. THIS TRANSITION IN MODE AND A
   DECOUPLING BOUNDARY LAYER SUGGEST THE TORNADO THREAT SHOULD
   GRADUALLY WANE THIS EVENING. HOWEVER...THREAT FOR DAMAGING WIND AND
   HAIL WILL LIKELY PERSIST ANOTHER FEW HOURS AS STORMS CONTINUE
   DEVELOPING WITHIN RESERVOIR OF MODERATE INSTABILITY.
   
   ..DIAL.. 06/24/2009
   
   
   ATTN...WFO...GID...LBF...
   
   LAT...LON   41069968 40700183 41540213 42390237 42790103 42269959
               41069968