MESOSCALE DISCUSSION 1575
   NWS STORM PREDICTION CENTER NORMAN OK
   0412 AM CDT THU JUL 16 2009
   
   AREAS AFFECTED...NEB AND NCNTRL KS.
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 160912Z - 161115Z
   
   TSTMS WILL CONTINUE TO INCREASE ACROSS MOST OF NEB AND PERHAPS
   EXTREME NCNTRL KS THROUGH DAYBREAK.  AT LEAST ISOLD LARGE HAIL AND
   DMGG WIND GUSTS CAN BE EXPECTED.
   
   NOCTURNAL TSTMS HAVE INITIATED IN TWO ZONES EARLY THIS MORNING. 
   FAST MOVING STORMS MOVING OUT OF SRN SD ARE ASSOCD WITH MODEST
   ASCENT ASSOCD WITH A MID-LVL IMPULSE.  A SEPARATE AREA OF STORMS HAS
   EVOLVED ALONG THE NOSE OF A 30 KT SLY LLJ AND ALONG EXTREME SRN
   FRINGES OF THE SD IMPULSE.
   
   THROUGH DAYBREAK...EXPECT THAT STORMS WILL INCREASE E AND NEWD FROM
   SWRN NEB AND SEWD THROUGH NRN/CNTRL NEB AS LARGE SCALE HEIGHT FALLS
   INCREASE OVER THE REGION AND THE LLJ BEGINS TO VEER.  EFFECTIVE
   SHEAR REMAINS QUITE SUPPORTIVE OF BRIEF SUPERCELLS...THOUGH NUMBER
   OF STORMS BEING GENERATED /STORM COMPETITION/ MAY ADD TO THE
   RANDOMNESS OF UPDRAFT INTENSITY.  NONETHELESS...MID-LVL LAPSE RATES
   WERE QUITE STEEP AND STRONGER CELLS WILL YIELD LARGE HAIL.
   
   ADDITIONALLY...KINEMATIC/THERMODYNAMIC SETUP...PARTICULARLY OVER
   SWRN NEB...WILL LEAD TO A SHORT TERM THREAT FOR VERY HVY RNFL RATES.
    PWATS OF 1.5-1.9 INCHES /PER GPS SENSORS/ WILL FEED INTO BACK EDGE
   OF CURRENT STORMS AND BACKBUILDING/TRAINING OF STORMS WILL GIVE A
   RISK OF A FEW HOURS OF 1-2 INCH PER HOUR RATES.  THIS WILL
   ESPECIALLY BE THE CASE IN AREAS NEAR/S OF KLBF SEWD TO JUST S OF
   KLXN.  SOME OF THIS ACTIVITY MAY APPROACH PARTS OF EXTREME NCNTRL
   KS...BUT THE PRIMARY DEVELOPMENT SHOULD BE OVER NEB.
   
   ..RACY.. 07/16/2009
   
   
   ATTN...WFO...FSD...OAX...GID...LBF...GLD...
   
   LAT...LON   42800217 42979880 42549703 41839620 40909649 40239792
               39809877 39890024 40420112 40970171 42800217