MESOSCALE DISCUSSION 0615
   NWS STORM PREDICTION CENTER NORMAN OK
   0119 AM CDT TUE APR 28 2009
   
   AREAS AFFECTED...PARTS OF SERN TX
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 280619Z - 280745Z
   
   THE POTENTIAL FOR ISOLATED SEVERE HAIL WILL EXIST WITH DEVELOPING
   STORMS.  A WW IS NOT CURRENTLY ANTICIPATED.
   
   ELEVATED TSTMS ARE SLOWLY INCREASING IN COVERAGE AND INTENSITY EARLY
   THIS MORNING FROM JUST E OF AUS TO N OF HOU.  ACTIVITY IS LIKELY
   BEING GENERATED WITHIN A ZONE OF ASCENT N OF REMNANT OUTFLOW
   BOUNDARY ALONG 30 KT LLJ AXIS.  RUC FORECAST SOUNDINGS INDICATE THAT
   AIR MASS ABOVE SHALLOW SURFACE STABLE LAYER REMAINS MODERATELY
   UNSTABLE WITH MUCAPE OF AROUND 1500 J/KG.  THIS INSTABILITY IN
   CONCERT WITH 40 KT OF VERTICAL SHEAR THROUGH THE CLOUD-BEARING LAYER
   MAY SUPPORT A FEW INTENSE STORMS CAPABLE OF MARGINALLY SEVERE HAIL.
   
   LOCALLY EXCESSIVE RAINFALL /I.E. HOURLY RATES APPROACHING 2 INCHES/
   MAY ALSO BECOME AN ISSUE WITH TIME OWING TO CELL
   BACKBUILDING/TRAINING.
   
   ..MEAD.. 04/28/2009
   
   
   ATTN...WFO...HGX...EWX...
   
   LAT...LON   29569732 29929760 30259744 30429686 30639593 30629511
               30399475 30019466 29639503 29379593 29369666 29569732