MESOSCALE DISCUSSION 0908
   NWS STORM PREDICTION CENTER NORMAN OK
   0711 PM CDT TUE MAY 13 2008
   
   AREAS AFFECTED...PARTS OF THE SERN PLAINS THROUGH THE MS VLY
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 140011Z - 140215Z
   
   SCATTERED ONGOING CLUSTERS OF STORMS CONTINUE TO DEVELOP FROM PARTS
   OF SOUTHEAST TEXAS/LOUISIANA NORTH NORTHEASTWARD THROUGH MUCH OF THE
   MISSISSIPPI VALLEY.  THESE ARE LIKELY ASSOCIATED WITH ZONES OF
   STRONGER/STEEPER ISENTROPIC ASCENT WITHIN A BROADER BELT OF
   ISENTROPIC ASCENT DOWNSTREAM FROM NORTHERN AND SOUTHERN BRANCH
   TROUGHS.  ACTIVITY FROM NORTHEAST ARKANSAS THROUGH NORTHERN
   ILLINOIS/WISCONSIN WILL LIKELY DEVELOP EASTWARD INTO PARTS OF THE
   LOWER OHIO VALLEY AND GREAT LAKES REGION THIS EVENING...AHEAD OF THE
   MORE PROGRESSIVE NORTHERN BRANCH SYSTEM.  STORMS OVER EAST
   TEXAS/LOUISIANA WILL PROBABLY BE MUCH SLOWER TO SHIFT EASTWARD.
   
   ACTIVITY APPEARS MOSTLY BASED IN A MOIST LAYER RETURNING ABOVE A
   RELATIVELY COOLER/DRIER BOUNDARY LAYER ASSOCIATED WITH THE
   RETREATING SURFACE HIGH ACROSS EASTERN STATES.  BUT...MODERATE
   INSTABILITY AND WEAK TO MODERATE CLOUD BEARING LAYER SHEAR HAVE BEEN
   SUFFICIENT FOR HAIL IN STRONGER STORMS.  WHILE CONVECTION MAY BE
   SLOW TO DIMINISH THIS EVENING...HAIL POTENTIAL IS EXPECTED TO BECOME
   MORE MARGINAL/LOCALIZED AS THE SOURCE REGION FOR THE LIFTED PARCELS
   BEGINS TO STABILIZE WITH LOSS OF DAYTIME HEATING.
   
   ..KERR.. 05/14/2008
   
   
   ATTN...WFO...CLE...ILN...DTX...APX...LMK...IWX...GRR...OHX...IND...PAH...LOT...ILX...MKX...MEG...JAN...LIX...LSX...DVN...LZK...SGF...LCH...SHV...
   
   29979224 31289330 32209452 33449394 34719375 35929307
   37039186 39179069 40978983 42488863 44238653 44408528
   41748340 39158379 36898585 35618832 34309013 31409010
   30348956 29428969