MESOSCALE DISCUSSION 1961
   NWS STORM PREDICTION CENTER NORMAN OK
   0847 PM CDT SUN AUG 23 2009
   
   AREAS AFFECTED...PARTS OF SERN CA...SRN NV...WRN AZ
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 732...
   
   VALID 240147Z - 240315Z
   
   CORRECTED FOR GRAPHIC POINTS
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 732
   CONTINUES.
   
   THE NEED FOR A NEW WW IS NOT CURRENTLY ANTICIPATED...AND THE SEVERE
   THREAT IN THE CURRENT WATCH MAY DIMINISH BEFORE 06Z.
   
   STORMS HAVE WEAKENED/DIMINISHED CONSIDERABLY DURING THE PAST HOUR OR
   SO ACROSS PARTS OF THE MOHAVE DESERT INTO THE LOWER COLORADO VALLEY.
   DESPITE FAVORABLE LARGE-SCALE ASCENT AHEAD OF A MID-LEVEL TROUGH
   PROGRESSING INTO SOUTHERN CALIFORNIA...WEAK LOW/MID-LEVEL WIND
   FIELDS AND SHEAR HAVE LIMITED THE DURATION OF THE INDIVIDUAL
   STORMS...AND THE OVERALL ORGANIZATION OF CONVECTIVE DEVELOPMENT. 
   WHILE...ISOLATED SHORT-LIVED STRONG/SEVERE STORMS REMAIN POSSIBLE
   ...THESE ARE EXPECTED TO BECOME INCREASINGLY SPARSE IN COVERAGE WITH
   THE ONSET OF DIURNAL BOUNDARY LAYER COOLING THROUGH 02-04Z.
   
   ..KERR.. 08/24/2009
   
   
   ATTN...WFO...FGZ...SLC...PSR...VEF...
   
   LAT...LON   37191527 37201274 33491337 33471580 37191527