MESOSCALE DISCUSSION 1329
   NWS STORM PREDICTION CENTER NORMAN OK
   0617 PM CDT MON JUN 20 2011
   
   AREAS AFFECTED...CNTRL/ERN NEB...NRN/ERN KS...WRN IA...SERN SD
   
   CONCERNING...TORNADO WATCH 523...524...
   
   VALID 202317Z - 210015Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 523...524...CONTINUES.
   
   NEW WW WILL LIKELY BE FORTHCOMING TO REPLACE PARTS OF WW 523/524 AND
   TO INCLUDE PORTIONS OF SERN SD/NWRN IA.
   
   GREATEST TORNADO THREAT SHOULD PERSIST ACROSS PORTIONS OF
   CNTRL/E-CNTRL NEB N/E OF PRIMARY SURFACE CYCLONE NEAR GRI...EVOLVING
   E/NEWD THROUGH THE NEXT FEW HOURS. ENLARGED HODOGRAPHS /SAMPLED BY
   OMAHA VWP/ HAVE CONTRIBUTED TO 0-1 KM SRH AOA 200 M2/S2 AMIDST A
   STRONGLY UNSTABLE AIR MASS WILL REMAIN VERY FAVORABLE FOR SUPERCELLS
   AND POTENTIAL SIGNIFICANT TORNADOES.
   
   FARTHER SW...TSTM CLUSTER HAS REMAINED QUASI-STATIONARY INVOF PIVOT
   POINT OF SHORT WAVE TROUGH AXIS OVER NWRN KS. TORNADO THREAT SHOULD
   GRADUALLY DIMINISH HERE AS SHORT WAVE TROUGH CONTINUES EWD.
   
   STRONG LINEAR FORCING ASSOCIATED WITH THE N/S-ORIENTED SURFACE COLD
   FRONT AND S/SWLY DEEP-LAYER FLOW HAVE RESULTED IN VIGOROUS UPSCALE
   GROWTH AND INCIPIENT QLCS FORMATION ACROSS PORTIONS CNTRL/ERN KS. AS
   MID-LEVEL SPEED MAX SHIFTS E/NEWD THIS EVENING AND SURFACE COLD POOL
   STRENGTHENS...EMBEDDED LEWPS/BOWING STRUCTURES APPEAR LIKELY TO
   DEVELOP...ENHANCING THE THREAT FOR DAMAGING WINDS ACROSS ERN KS/FAR
   SERN NEB TOWARDS THE MO RIVER VALLEY.
   
   ..GRAMS.. 06/20/2011
   
   
   ATTN...WFO...EAX...FSD...OAX...TOP...ICT...OUN...GID...LBF...
   DDC...GLD...
   
   LAT...LON   39040003 39020044 39200075 40040076 40850029 42239922
               42909824 43079685 42729615 40959549 39169529 37029567
               36959777 38309737 39999759 40689816 40649881 39040003