Flood in California, September 10, 2002

EXTREME SOUTHWESTERN CALIFORNIA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
300 AM PDT TUE SEP 10 2002

.SYNOPSIS...ENOUGH RESIDUAL MOISTURE MAY REMAIN FOR A FEW
THUNDERSTORMS OVER THE MOUNTAINS AND DESERTS THIS AFTERNOON.
OTHERWISE...FAIR WEATHER WILL CONTINUE WITH BUILDING HIGH PRESSURE
ALONG THE WEST COAST BRINGING WARMER TEMPERATURES BY THE WEEKEND.

.DISCUSSION...THE ETA IS INITIALIZED BEST WITH THE WEAK UPPER LOW
JUST TO THE SOUTHWEST OF SAN DIEGO. THIS LOW WILL MOVE SLOWLY
NORTHEASTWARD DURING THE NEXT TWO DAYS...EXITING SOUTHERN CALIFORNIA
BY WEDNESDAY NIGHT. MID LEVEL MOISTURE OVER SOUTHWEST CALIFORNIA IS
BEGINNING TO DECREASE...BUT SHOULD STILL BE SUFFICIENT FOR A FEW
THUNDERSTORMS OVER THE SAN DIEGO COUNTY MOUNTAINS AND POSSIBLY THE
HIGHEST PEAKS OF THE SAN BERNARDINO MOUNTAINS THIS AFTERNOON. WITH
MOISTURE DECREASING...ANY THUNDERSTORMS TODAY SHOULD GENERATE MORE
WIND AND LESS RAINFALL THAN THOSE MONDAY AFTERNOON. MID LEVEL
MOISTURE SHOULD CONTINUE TO GRADUALLY DECREASE WEDNESDAY AND
THURSDAY...BUT WITH ENOUGH FOR A FEW AFTERNOON CLOUDS OVER THE
MOUNTAINS EACH AFTERNOON. WEAK EASTERLY LOW LEVEL FLOW WILL ALLOW
TEMPERATURES WEST OF THE MOUNTAINS TO REACH LEVELS A LITTLE GREATER
THAN THOSE OF MONDAY. BUILDING HIGH PRESSURE ALONG THE WEST COAST
COMBINED WITH WEAK DIURNAL OFFSHORE PRESSURE GRADIENTS COULD ALLOW
TEMPERATURES WEST OF THE MOUNTAINS TO GET QUITE WARM DURING THE
WEEKEND. IT MAY NOT BE UNTIL EARLY NEXT WEEK UNTIL THERE IS ANY
GREAT RESURGENCE OF THE MARINE LAYER.

.SAN...NONE.

MARTIN