Flash Flood Warning 58, NWS San Diego, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
930 AM PDT SAT SEP 11 2004

.SYNOPSIS...THE MOIST SUBTROPICAL FLOW ALOFT WILL BRINGING A CHANCE
OF THUNDERSTORMS IN THE MOUNTAINS AND DESERTS THIS AFTERNOON. A FLASH
FLOOD WATCH WILL BE IN EFFECT FOR THESE AREAS FROM NOON TO 8 PM. A
GRADUAL COOLING AND DRYING TREND WILL BEGIN ON SUNDAY...AND CONTINUE
INTO THE EARLY PART OF NEXT WEEK FOR COOLER WEATHER...AND AN INCREASE
IN MARINE LAYER CLOUDS.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES.

SOUTHERN CALIFORNIA CONTINUES TO REMAIN IN THE NORTHEAST QUADRANT OF
A WEAK UPPER LEVEL LOW.  MOISTURE CONTINUES TO FEED INTO THE FEATURE
FROM THE SOUTH.  ENOUGH DYNAMICS AND DIFLUENCE SHOULD SPARK ANOTHER
ROUND OF HEAVY SHOWERS AND THUNDERSTORMS TODAY.  FLASH FLOOD WATCH
STILL LOOKS LIKE A GOOD IDEA.

LOW CLOUDS MANAGED TO COME IN OVER NORTH COUNTY...BUT OTHERWISE MOST
AREAS WERE SPARED. TOMORROWS PATTERN WILL PROBABLY BE SIMILAR...OR
MAYBE A BIT MORE MARINE LAYER LOW CLOUDS THAN THIS MORNING. AS FOR
TEMPERATURES...LATEST GUIDANCE POINTS AT ABOVE NORMAL AFTERNOON
TEMPERATURES AGAIN TODAY WITH RATHER HIGH HUMIDITIES.

THE MID LEVEL MOISTURE SEEMS TO WANT TO HANG ROUND INTO TOMORROW IN
THE MOUNTAINS AND DESERTS FOR STILL SOME RESIDUAL SHOWERS AND
THUNDERSTORMS. A LARGER UPPER TROUGH CONTINUES TO BE ADVERTISED IN THE
MODELS AS A KICKER FOR THE WEAK TROUGH THAT HAS BEEN HANGING AROUND
OFFSHORE THE LAST FEW DAYS...AND BY MONDAY WE STILL PLAN TO DRY OUT
THE FORECAST. IT SHOULD TURN COOLER AND LESS HUMID WITH MORE MARINE
LAYER CLOUDS NEXT WEEK AS THE WESTERLY FLOW INCREASES AND DRIES OUT
THE AIRMASS.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH...........LAXFFASGX.
HAZARDOUS WEATHER OUTLOOK...LAXHWOSGX.

&&

SMALL

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN DIEGO CA
400 AM PDT SAT SEP 11 2004

CAZ055-056-058-060>062-121300-
SAN BERNARDINO COUNTY MOUNTAINS-
RIVERSIDE COUNTY MOUNTAINS-
SAN DIEGO COUNTY MOUNTAINS-
APPLE AND YUCCA VALLEYS-
COACHELLA VALLEY-
SAN DIEGO COUNTY DESERTS-
400 AM PDT SAT SEP 11 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EXTREME SOUTHWESTERN CALIFORNIA.

.DAY ONE... TODAY THROUGH TONIGHT.

SCATTERED THUNDERSTORMS ARE EXPECTED IN THE MOUNTAINS AND DESERTS THIS
AFTERNOON. A FLASH FLOOD WATCH WILL BE IN EFFECT FROM NOON TO 8 PM.
REFER TO LAXFFASGX WGUS66 KSGX FOR DETAILS.

.DAYS TWO THROUGH SEVEN... SUNDAY THROUGH FRIDAY.

ISOLATED THUNDERSTORMS WILL BE POSSIBLE IN THE MOUNTAINS SUNDAY.

MOEDE

PRELIMINARY LOCAL STORM REPORT...UPDATED
NATIONAL WEATHER SERVICE SAN DIEGO CA
915 AM PDT SAT SEP 11 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0504 PM     FLASH FLOOD      BORREGO SPRINGS         33.24N 116.35W
09/10/2004                   SAN DIEGO          CA   PARK/FOREST SRVC

            FLASH FLOODING BEGAN AROUND 445 PM IN BORREGO PALM CANYON
            AND SPREAD TO BORREGO SPRINGS. FLASH FLOODING ALSO
            OCCURRED IN COYOTE CANYON. EMPTY CAMPGROUND OBLITERATED
            BY WALL OF WATER 20 TO 25 FEET HIGH. 70 TO 90 HOMES
            DAMAGED BY WATER AND MUD IN THE SUN GOLD AND DE ANZA
            AREAS OF BORREGO SPRINGS.

&&

BM