MESOSCALE DISCUSSION 1409
   NWS STORM PREDICTION CENTER NORMAN OK
   0848 PM CDT SUN JUN 26 2011
   
   AREAS AFFECTED...IA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 559...
   
   VALID 270148Z - 270345Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 559
   CONTINUES.
   
   POTENTIAL FOR WIDESPREAD DAMAGING WIND GUSTS WILL PERSIST THROUGH
   04Z AND BEYOND AS BOW ECHO SYSTEM MOVES EWD THROUGH WRN AND CNTRL
   IA.
   
   A WELL ORGANIZED MCS WITH BOW ECHO AND COMMA HEAD EXTENDS FROM WRN
   IA SWWD INTO SERN NEB. ACTIVITY IS DEVELOPING NORTH OF A WARM FRONT
   WHERE INFLOW FROM A VERY MOIST AND UNSTABLE WARM SECTOR /4000+
   MLCAPE/ WILL BE MAINTAINED ALONG A SSWLY 30+ KT LLJ. AVERAGE SPEED
   OF THE LINE IS AROUND 45 KT...BUT THE APEX OF THE BOW HAS BEEN
   ACCELERATING AND WILL LIKELY BEGIN TO AFFECT THE DES_MOINES METRO
   AREA NEAR OR BEFORE 03Z. WIDESPREAD DAMAGING WIND IS THE PRIMARY
   THREAT...BUT LARGE HAIL IS ALSO POSSIBLE.
   
   ..DIAL.. 06/27/2011
   
   
   ATTN...WFO...DMX...OAX...
   
   LAT...LON   40989528 41849493 42429491 42299296 41929246 41199267
               40709376 40989528