MESOSCALE DISCUSSION 1408
   NWS STORM PREDICTION CENTER NORMAN OK
   0725 PM CDT SUN JUN 26 2011
   
   AREAS AFFECTED...SRN SD THROUGH WRN AND NRN NEB
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 557...
   
   VALID 270025Z - 270130Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 557
   CONTINUES.
   
   SEVERE THUNDERSTORM WATCH 557 WILL LIKELY BE REPLACED BY ANOTHER WW
   SOON. 
   
   EARLY THIS EVENING A COLD FRONT STRETCHES ACROSS ERN SD WHERE IT
   INTERSECTS AN EXPANSIVE OUTFLOW BOUNDARY THAT EXTENDS FROM SERN SD
   INTO NERN NEB THEN NWWD INTO NWRN NEB WHERE IT AGAIN INTERSECTS THE
   COLD FRONT THAT EXTENDS SWWD INTO SERN WY. A RESERVOIR OF STRONG
   INSTABILITY PERSISTS ALONG AND SOUTH OF THESE BOUNDARIES. STORMS
   WILL LIKELY CONTINUE DEVELOPING IN ASSOCIATION WITH FRONTOGENETIC
   FORCING ALONG THE COLD FRONT MOVING INTO WRN NEB AS WELL AS WITHIN
   ZONE OF ISENTROPIC LIFT NORTH OF THE OUTFLOW BOUNDARY. THIS REGION
   WILL REMAIN WITHIN ZONE OF DEEPER FORCING FOR ASCENT ASSOCIATED WITH
   SHORTWAVE TROUGH MOVING TOWARD THE NRN HIGH PLAINS. SUPERCELLS AND
   BOWING SEGMENTS WITH ISOLATED DAMAGING WIND AND LARGE HAIL WILL BE
   THE MAIN THREATS.
   
   ..DIAL.. 06/27/2011
   
   
   ATTN...WFO...LBF...CYS...
   
   LAT...LON   42890292 42870030 42119977 41000072 41700374 42890292