MESOSCALE DISCUSSION 1819
   NWS STORM PREDICTION CENTER NORMAN OK
   1122 PM CDT FRI AUG 07 2009
   
   AREAS AFFECTED...CNTRL SD INTO N-CNTRL NEB
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 674...
   
   VALID 080422Z - 080545Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 674
   CONTINUES.
   
   THROUGH 06Z...THE THREAT FOR ISOLATED HAIL AND DAMAGING WINDS WILL
   CONTINUE ACROSS WRN PART OF WW AREA.
   
   INITIAL SUPERCELL WHICH TRACKED ACROSS WRN SD HAS DECAYED OVER JONES
   COUNTY SD.  HOWEVER...SCATTERED...STRONG TO SEVERE STORMS EXIST FROM
   JACKSON COUNTY SD SWWD INTO NWRN CHERRY AND SHERIDAN COUNTIES IN NEB
   AS OF 0412Z.  WHILE CURRENT STORMS ARE SITUATED TO THE N OF INITIAL
   COLD FRONTAL SURGE...AREA PROFILERS AND VWPS INDICATE THAT ACTIVITY
   IS WITHIN A ZONE OF DEEPER-LAYER CONVERGENCE NOTED BETWEEN RAP AND
   MERRIMAN NEB.  
   
   RUC OBJECTIVE FIELDS INDICATE THAT CONVECTIVE INHIBITION IS
   GRADUALLY INCREASING WHICH IS CONSISTENT WITH THE COOLING OF THE
   BOUNDARY LAYER.  HOWEVER...MERGING STORM COLD POOLS MAY PROVIDE
   SUFFICIENT LOW-LEVEL ASCENT TO SUSTAIN ONGOING STORM CLUSTER.  HAIL
   AND LOCALLY DAMAGING WIND GUSTS WILL REMAIN THE PRIMARY SEVERE
   THREATS WITH THE MOST INTENSE STORMS.
   
   ..MEAD.. 08/08/2009
   
   
   ATTN...WFO...FSD...ABR...LBF...UNR...
   
   LAT...LON   42420169 44230088 44740009 44669926 44069905 42519994
               42130034 42150155 42420169