MESOSCALE DISCUSSION 1620
   NWS STORM PREDICTION CENTER NORMAN OK
   0554 PM CDT SUN JUL 19 2009
   
   AREAS AFFECTED...EAST TEXAS
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 603...
   
   VALID 192254Z - 200030Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 603
   CONTINUES.
   
   THE NEED FOR AN ADDITIONAL WW IS NOT ANTICIPATED.
   
   LARGE-SCALE FORCING FOR UPWARD VERTICAL MOTION ACROSS THE REGION IS
   WEAK/UNCLEAR...PERHAPS LIMITED TO WEAK LOW-LEVEL WARM ADVECTION
   BENEATH BROADLY DIFLUENT NORTHWESTERLY MID/UPPER FLOW.  THIS IS
   EXPECTED TO REMAIN THE CASE THROUGH THE REMAINDER OF THE AFTERNOON/
   EVENING.  CONVECTIVELY GENERATED CLOUD COVER AND SURFACE OUTFLOW
   APPEAR TO HAVE STABILIZED A CONSIDERABLE PORTION OF THE WATCH AREA
   ...AND A CONVECTIVE OUTFLOW ENHANCED SEA BREEZE HAS STABILIZED MUCH
   OF THE HOUSTON METRO AND ADJACENT COASTAL AREAS.  WIDELY SCATTERED
   SHORT LIVED STRONG STORMS REMAIN POSSIBLE IN POCKETS OF LINGERING
   MIXED LAYER CAPE OF 2000-3000 J/KG ACROSS CENTRAL/EASTERN AND
   SOUTHEAST TEXAS...BUT POTENTIAL FOR THE EVOLUTION OF AN ORGANIZED
   STORM CLUSTER APPEARS TO BE DIMINISHING.
   
   ..KERR.. 07/19/2009
   
   
   ATTN...WFO...LCH...SHV...HGX...FWD...EWX...
   
   LAT...LON   33239802 33229525 30079404 30139678 33239802