MESOSCALE DISCUSSION 1180
   NWS STORM PREDICTION CENTER NORMAN OK
   0543 PM CDT WED JUN 17 2009
   
   AREAS AFFECTED...NERN CO/SERN WY/NEB/NRN KS/SWRN IA/NWRN MO
   
   CONCERNING...TORNADO WATCH 440...445...
   
   VALID 172243Z - 180015Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 440...445...CONTINUES.
   
   ISOLATED STORM DEVELOPMENT IS ONGOING ACROSS THE CENTRAL PLAINS
   REGION...WHERE LOCAL SEVERE/TORNADO THREAT CONTINUES.
   
   LATEST SURFACE ANALYSIS INDICATES A WARM FRONT LYING ROUGHLY W-E
   ACROSS THE CENTRAL THIRD OF KS...WITH A VERY UNSTABLE AIRMASS /3000
   TO 5000 J/KG MIXED-LAYER CAPE/ NEAR AND N OF THIS BOUNDARY.  EARLIER
   CONVECTION OVER SERN SD/NERN KS CONTINUES MOVING ESEWD ACROSS NWRN
   MO INTO TORNADO WATCH 443...BUT ISOLATED STORMS CONTINUE TO DEVELOP
   FARTHER W WITHIN SELY LOW-LEVEL FLOW FIELD N OF THE FRONT ACROSS
   NERN CO/SERN WY AND EWD ACROSS NEB.
   
   AS A SLY LOW-LEVEL JET INCREASES THIS EVENING AHEAD OF A MID-LEVEL
   SHORT-WAVE TROUGH EJECTING NEWD FROM THE CENTRAL ROCKIES...STORM
   COVERAGE IS EXPECTED TO CONTINUE INCREASING.  MODERATE WLYS AT
   MID-LEVELS ATOP STRENGTHENING SLY LOW-LEVEL FLOW WILL RESULT IN
   SHEAR INCREASINGLY-FAVORABLE FOR SUPERCELLS...AND THUS THE
   SEVERE/TORNADO THREAT SHOULD EXPAND WITH TIME ACROSS THIS REGION. 
   WITH THIS THREAT LIKELY TO INCREASE WITH TIME N OF THESE WATCHES --
   I.E. ACROSS N CENTRAL AND NERN NEB AND INTO THE SERN QUARTER OF
   SD...NEW TORNADO WATCH WILL LIKELY BE REQUIRED IN THIS AREA.
   
   ..GOSS.. 06/17/2009
   
   
   ATTN...WFO...DMX...EAX...FSD...OAX...TOP...ABR...GID...LBF...
   UNR...GLD...PUB...BOU...CYS...
   
   LAT...LON   41890523 42450231 42730138 43420039 43939570 41669372
               39679427 39289917 39060515 40630562 41890523