MESOSCALE DISCUSSION 0300
   NWS STORM PREDICTION CENTER NORMAN OK
   0637 AM CDT WED MAR 21 2007
   
   AREAS AFFECTED...MUCH OF CENTRAL/SRN IA AND FAR NRN MO
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 211137Z - 211330Z
   
   TSTMS WILL CONTINUE TO DEVELOP ACROSS SWRN IA/NWRN MO AND SPREAD
   ENEWD ACROSS FAR NRN MO AND SRN/CENTRAL IA THIS MORNING.  ISOLATED
   SEVERE HAIL WILL BE POSSIBLE WITH THE STRONGER STORMS...BUT COVERAGE
   OF SEVERE THREAT SHOULD BE LIMITED AS STORMS MOVE EAST OF GREATER
   INSTABILITY AXIS OVER THE CENTRAL/SRN PLAINS.
   
   WATER VAPOR IMAGERY INDICATED A WEAK MID LEVEL IMPULSE LOCATED ALONG
   THE NEB/IA BORDER...WITH THIS FEATURE EXPECTED TO TRACK ACROSS IA
   THIS MORNING.  RECENT TSTM ACTIVITY THAT DEVELOPED OVER SWRN IA
   APPEARS TO BE ORIENTED ALONG THE LEADING EDGE OF STRONGER DEEP LAYER
   ASCENT ATTENDANT WITH MID LEVEL IMPULSE.  THESE TSTMS ARE ROOTED
   ABOVE THE SURFACE...NEAR 850-900 MB...PER LATEST RUC FORECAST
   SOUNDINGS AND NE OF RETREATING WARM FRONT.  MOISTURE/WARM AIR
   ADVECTION ALONG NOSE OF LLJ AND ASCENT WITH MID LEVEL IMPULSE SHOULD
   MAINTAIN TSTM ACTIVITY ENEWD ACROSS IA/NRN MO THIS MORNING.  STEEP
   LAPSE RATES SUGGEST A POTENTIAL FOR A FEW STORMS TO PRODUCE ISOLATED
   LARGE HAIL.
   
   ..PETERS.. 03/21/2007
   
   
   ATTN...WFO...LSX...DVN...ARX...DMX...EAX...OAX...
   
   39649511 40499519 41519532 41889546 42249526 42769383
   42919302 42899264 41879221 40879202 39979215 39619321
   39519444