MESOSCALE DISCUSSION 0505
   NWS STORM PREDICTION CENTER NORMAN OK
   0650 PM CDT FRI APR 17 2009
   
   AREAS AFFECTED...LOWER SABINE RIVER VALLEY SWWD INTO THE LOWER TX
   COAST
   
   CONCERNING...TORNADO WATCH 162...
   
   VALID 172350Z - 180115Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 162 CONTINUES.
   
   THE POTENTIAL FOR ISOLATED SEVERE STORMS IS EXPECTED TO CONTINUE
   ALONG THE COAST THROUGH AROUND 01Z.  HAIL AND LOCALLY STRONG WIND
   GUSTS WILL REMAIN THE PRIMARY SEVERE WEATHER THREATS.
   
   AS OF 2330Z...REGIONAL RADAR IMAGERY INDICATED A LONG-LIVED MCS OVER
   FAR SERN TX INTO SWRN LA WITH THE LEADING EDGE OF THE MOST INTENSE
   CONVECTION FROM ORANGE COUNTY SWWD TO GALVESTON BAY.  WHILE THE MCV
   ATTENDANT TO PARENT SYSTEM IS TRANSLATING EWD...THE MORE INTENSE
   CONVECTION ALONG LEADING EDGE OF THE COLD POOL IS MOVING/PROPAGATING
   SEWD AT AROUND 20 KT.  LOCALLY EXCESSIVE RAINFALL /HOURLY RATES OF
   1-2 INCHES/ WILL BE THE PRIMARY HAZARD...THOUGH STRONG WIND GUSTS
   REMAIN POSSIBLE.
   
   ELSEWHERE...MORE ISOLATED STORMS EXHIBITING CONSIDERABLE DISCRETE
   PROPAGATION WERE OBSERVED ALONG WRN EXTENSION OF MESOSCALE OUTFLOW
   BOUNDARY OVER NUECES INTO DUVAL COUNTIES IN DEEP S TX.  SOME
   PERIODIC SUPERCELL CHARACTERISTIC HAVE BEEN OBSERVED WITH THIS
   ACTIVITY AS IT PROGRESSES SEWD/SWD AT 10-20 KT.  HAIL AND LOCALLY
   STRONG WIND GUSTS WILL REMAIN POSSIBLE WITH THESE STORMS PRIOR TO
   MOVING OFFSHORE AND/OR SLOWLY WEAKENING WITH THE DIURNAL COOLING OF
   THE BOUNDARY LAYER LATER THIS EVENING.
   
   ..MEAD.. 04/17/2009
   
   
   ATTN...WFO...LCH...HGX...CRP...EWX...BRO...
   
   LAT...LON   27549889 28559786 29599654 30209533 30519426 30139370
               29459396 28289595 27449712 27269774 27229834 27549889