MESOSCALE DISCUSSION 0509
   NWS STORM PREDICTION CENTER NORMAN OK
   0853 PM CDT WED APR 17 2013
   
   AREAS AFFECTED...PORTIONS OF SERN KS...A LARGE PART OF MO...AND
   W-CNTRL IL
   
   CONCERNING...TORNADO WATCH 114...117...
   
   VALID 180153Z - 180330Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 114...117...CONTINUES.
   
   SUMMARY...THE SVR THREAT CONTINUES ACROSS REMAINING VALID PORTIONS
   OF WW114 AND WW117. THE SVR THREAT MAY LINGER ACROSS PARTS OF THE
   AREA BEYOND THE SCHEDULED 03Z WW EXPIRATION TIME...POTENTIALLY
   WARRANTING A REPLACEMENT WW.
   
   DISCUSSION...THE STRONGEST STORMS ACROSS THE AREA ARE EVOLVING
   WITHIN AN ANAFRONTAL REGIME N OF A WNW-ENE-ORIENTED QUASISTATIONARY
   THAT APPROXIMATELY BISECTS MO...AND BEHIND A COLD FRONT ADVANCING
   EWD ACROSS PARTS OF SERN KS. SVR HAIL WILL BE THE PRIMARY CONCERN
   WITH THIS ACTIVITY...AS EVENING 00Z RAOBS INDICATE STRONG STABILITY
   IN THE LOW LEVELS ON THE COOL SIDES OF THE AFOREMENTIONED
   BOUNDARIES. THIS ACTIVITY MAY PERSIST INTO THE OVERNIGHT HOURS AS
   FORCING FOR ASCENT WELL IN ADVANCE OF A MID-LEVEL CYCLONE OVER THE
   CNTRL ROCKIES CONTINUES. ALSO...SVR STORMS OVER OKLAHOMA WILL
   ADVANCE INTO MO DURING THE NEXT SEVERAL HOURS. WHILE THIS ACTIVITY
   WILL HAVE AN INCREASING PROPENSITY TO BECOME ELEVATED AS IT BECOMES
   UNDERCUT BY THE COLD FRONT...AND PREFRONTAL NOCTURNAL STABILIZATION
   OCCURS...SVR HAIL/WINDS WILL BE POSSIBLE. A TORNADO CANNOT BE RULED
   OUT NEAR/JUST AHEAD OF THE FRONT GIVEN STRONG LOW-LEVEL SHEAR
   FORECAST TO BE PRESENT THROUGH THE NIGHT. THE LINGERING SVR THREAT
   AFTER 03Z ACROSS PARTS OF THE AREA MAY BE ADDRESSED WITH A
   REPLACEMENT WW.
   
   ..COHEN.. 04/18/2013
   
   
   ATTN...WFO...ILX...LSX...SGF...EAX...TSA...TOP...ICT...
   
   LAT...LON   38309554 38819362 39799210 39979091 39619013 38479045
               37239162 36699292 36569441 37029463 37129613 38309554