MESOSCALE DISCUSSION 1308
   NWS STORM PREDICTION CENTER NORMAN OK
   0916 PM CDT SUN JUN 19 2011
   
   AREAS AFFECTED...PARTS OF ERN NEB...SRN IA...NRN MO
   
   CONCERNING...TORNADO WATCH 516...
   
   VALID 200216Z - 200315Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 516 CONTINUES.
   
   ANOTHER WW LIKELY WILL BE ISSUED ACROSS PORTIONS OF THE MID MISSOURI
   VALLEY TO THE NORTH OF WW 516 WITHIN THE NEXT HOUR OR SO.
   
   NEW CONVECTIVE DEVELOPMENT NOW APPEARS UNDERWAY ACROSS SOUTHEASTERN
   NEBRASKA AND NORTHWESTERN MISSOURI.  THIS IS OCCURRING WITHIN A ZONE
   OF STRENGTHENING LOWER/MID TROPOSPHERIC WARM ADVECTION...ON THE
   NORTHEASTERN FRINGE OF VERY WARM AND MORE STRONGLY CAPPING ELEVATED
   MIXED LAYER AIR WHICH HAS OVERSPREAD MUCH OF THE CENTRAL AND
   SOUTHERN PLAINS.  AS A SOUTHERLY LOW-LEVEL JET INCREASES TO 50-70
   KTS ACROSS THE CENTRAL PLAINS THROUGH 03-06Z...THUNDERSTORMS ARE
   EXPECTED TO INCREASE IN NUMBER/COVERAGE...AND MAY IMPACT AREAS OF
   EASTERN NEBRASKA/SOUTHERN IOWA TO THE NORTH OF WW 516.  BENEATH
   30-40 KT WEST SOUTHWESTERLY 500 MB FLOW...VERTICAL SHEAR AND
   INSTABILITY ARE FAVORABLE FOR SEVERE STORMS...INCLUDING A FEW
   SUPERCELLS.
   
   ..KERR.. 06/20/2011
   
   
   ATTN...WFO...DVN...DMX...EAX...OAX...
   
   LAT...LON   41629707 42089628 42079420 41899237 41319192 40659204
               39949291 39889381 40269546 40529659 40559713 41629707