MESOSCALE DISCUSSION 1676
   NWS STORM PREDICTION CENTER NORMAN OK
   0945 AM CDT SUN JUL 26 2009
   
   AREAS AFFECTED...W CENTRAL AND SWRN MS/NRN AND CENTRAL LA/PARTS OF E
   TX
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 261445Z - 261645Z
   
   LOOSELY-ORGANIZED CLUSTER OF STORMS FROM NRN MS WWD TO NE TX MAY
   INTENSIFY BY EARLY AFTERNOON...POSSIBLY REQUIRING EVENTUAL WW
   ISSUANCE.
   
   RADAR IMAGERY CONTINUES TO SHOW SWD-MOVING STORMS DEVELOPING IN A
   DISCONTINUOUS BAND FROM NE TX ENEWD INTO NRN MS -- WITH THE MOST
   VIGOROUS ACTIVITY -- CAPABLE OF PRODUCING MARGINALLY-SEVERE HAIL --
   NOW OVER NWRN MS.  STORMS APPEAR TO BE ELEVATED...BEING FED FROM THE
   W BY A WEAK WLY LOW-LEVEL JET.  THE BOUNDARY-LAYER AIRMASS AHEAD OF
   THE CONVECTION REMAINS QUITE MOIST...AND WITH VISIBLE IMAGERY
   SHOWING ONLY SCATTERED CLOUDS...EXPECT MODERATE DESTABILIZATION TO
   OCCUR IN CONJUNCTION WITH DIURNAL HEATING.
   
   WHILE HIGH-RES MODEL DATA SUGGESTS SOME POTENTIAL FOR CONVECTIVE
   WEAKENING AS THE LOW-LEVEL JET DIMINISHES INTO THE
   AFTERNOON...DESTABILIZING AIRMASS COULD ALTERNATIVELY SUPPORT A
   CONVECTIVE INCREASE -- PARTICULARLY IF AN ORGANIZED COLD
   POOL/OUTFLOW CAN EVOLVE THIS MORNING FROM THE ONGOING STORMS.  WHILE
   DEEP-LAYER WIND FIELD IS NOT PARTICULARLY STRONG...A SWD-MOVING
   CLUSTER OF STORMS AT THE LEADING EDGE OF A COLD POOL -- MOVING SWD
   AT 20 TO 30 KT IN NLY MEAN FLOW -- COULD RESULT IN A HEIGHTENED
   THREAT FOR DAMAGING WINDS.  WHILE THIS SCENARIO REMAINS
   UNCERTAIN...WE WILL CONTINUE TO MONITOR ONGOING CONVECTION FOR SIGNS
   OF COLD POOL ORGANIZATION AND SUBSEQUENT TRANSITION TO PRIMARILY
   SURFACE-BASED STORMS -- WHICH WOULD THEN REQUIRE WW ISSUANCE.
   
   ..GOSS.. 07/26/2009
   
   
   ATTN...WFO...JAN...LIX...LCH...SHV...HGX...FWD...
   
   LAT...LON   32229558 32679314 33639004 33128956 32248952 30789065
               30119344 30309471 31179533 32229558