SPC MESOSCALE DISCUSSION 1368 FOR SRN CA VALLEYS/MOUNTAINS
CONCERNING...SEVERE THUNDERSTORM POTENTIAL...

VALID 032148Z - 040000Z

THUNDERSTORMS PRODUCING STRONG/LOCALLY DAMAGING WIND GUSTS ARE
EXPECTED TO MOVE FROM THE MOUNTAINOUS AREAS FROM SAN DIEGO COUNTY
CA TO LOS ANGELES COUNTY AREAS WESTWARD INTO THE INTERIOR AND
COASTAL VALLEY AREAS LATE THIS AFTERNOON.  A WEATHER WATCH IS NOT
ANTICIPATED. 

LATEST VAD WIND PROFILE FROM SAN DIEGO AREA WSR-88D INDICATES
EASTERLY 500 MB FLOW OF 25 KNOTS.  SURFACE DEWPOINTS ON BOTH SIDES
OF THE MOUNTAINS ARE WELL INTO THE 50S AND AS HIGH AS THE MIDDLE
60S F.  DIURNAL HEATING OVER THE DESERTS HAS AGAIN BEEN
INTENSE...WITH TEMPERATURES RANGING FROM THE 100S IN THE HIGH
DESERTS TO THE 110S IN THE LOWER DESERTS.  MODERATE INSTABILITY
WITH MLCAPE OF 1000 J/KG IS INDICATED OVER THE MOUNTAINS...WITH
INSTABILITY IN EXCESS OF 500 J/KG AS FAR WEST AS SOME OF THE
COASTAL VALLEY AREAS.  GIVEN LARGE TEMPERATURE/DEWPOINT
SPREADS...DOWNBURSTS ARE POSSIBLE IN THE DESERT AND MOUNTAIN AREAS. 
WITH TEMPERATURES IN THE 90S AWAY FROM THE COASTAL STRIP...ISOLATED
STORMS WILL LIKELY MOVE WEST OF THE MOUNTAINS WITH POTENTIAL FOR
ISOLATED STRONG/SEVERE WIND GUSTS. 

..CRAVEN.. 07/03/01