MESOSCALE DISCUSSION 0799
   NWS STORM PREDICTION CENTER NORMAN OK
   0910 AM CDT TUE MAY 12 2009
   
   AREAS AFFECTED...CENTRAL/ERN OK INTO PARTS OF CENTRAL/ERN KS AND WRN
   AR
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 121410Z - 121515Z
   
   ISOLATED SEVERE HAIL WILL REMAIN POSSIBLE FROM PARTS OF CENTRAL OK
   AND DEVELOP NWD INTO PARTS OF CENTRAL KS THIS MORNING.
   
   WATER VAPOR IMAGERY INDICATED A WEAK SHORT WAVE TROUGH TRACKING EWD
   ACROSS CENTRAL KS...WITH AN ATTENDANT 45 KT WLY MID LEVEL SPEED MAX
   OVER FAR NRN OK PER WIND PROFILER.  LOW LEVEL MOISTURE RETURN/WARM
   AIR ADVECTION WILL PERSIST ALONG NOSE OF 35-40 KT LLJ EXTENDING INTO
   WRN/CENTRAL OK TO CENTRAL KS.  THIS COMBINED WITH ASCENT ATTENDANT
   TO MID LEVEL IMPULSE IS EXPECTED TO SUPPORT ADDITIONAL STRONG/
   SUSTAINED UPDRAFTS ALONG WRN EDGE OF ONGOING ACTIVITY FROM CENTRAL
   OK INTO CENTRAL KS...WITH THIS REGION RESIDING CLOSER TO STRONGER
   MOIST/MODERATELY UNSTABLE INFLOW.  EFFECTIVE BULK SHEAR /30-40 KT/
   AND STEEP MID LEVEL LAPSE RATES /7.6 C/KM PER OUN 12Z SOUNDING/ WILL
   SUPPORT ISOLATED SEVERE HAIL WITH THE STRONGER UPDRAFTS.  ACTIVITY
   SHOULD TEND TO WEAKEN AS IT SPREADS EWD INTO A MORE STABLE AIR MASS.
   
   ..PETERS.. 05/12/2009
   
   
   ATTN...WFO...LZK...SHV...TSA...TOP...ICT...OUN...DDC...
   
   LAT...LON   34979751 35859809 37319838 38829797 38669626 37399579
               36319581 35599492 35029357 34379338 33749437 34149561
               34979751