Flash Flood Watch 8, NWS San Diego, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
200 PM PDT MON AUG 4 2008

.SYNOPSIS...
MONSOONAL MOISTURE WILL BRING SOME AFTERNOON AND EVENING
THUNDERSTORMS TO THE MOUNTAINS AND DESERTS THROUGH THE EVENING. A
GRADUALLY SMALLER CHANCE OF THUNDERSTORMS WILL CONTINUE DURING THE
AFTERNOONS TUESDAY THROUGH THURSDAY. A DISRUPTED MARINE LAYER WILL
BRING AREAS OF NIGHT AND MORNING LOW CLOUDS AND FOG ALONG THE COAST.
A WEAK TROUGH OF LOW PRESSURE OFF THE WEST COAST WILL BRING DRIER
WEATHER LATER THIS WEEK.

&&

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

SCATTERED THUNDERSTORMS IN THE MTNS AND DESERTS ARE CAPABLE OF
PRODUCING FLASH FLOODS. THE AIR MASS IS QUITE MOIST AND THE TSTORMS
ARE GOING NOWHERE ONCE THEY FORM...SO ALL THAT HEAVY RAIN CAN FALL
IN ONE PLACE. EASTERLY FLOW MAY GUIDE A FEW OF THOSE TSTORMS INTO
THE INLAND VALLEYS. THE MARINE INFLUENCE IS OUT AND THE MONSOON
INFLUENCE IS IN FOR A COUPLE DAYS. COASTAL CLOUDS WILL BE PATCHY
TONIGHT AND TUE MORNING. HIGHER TEMPS WILL BE NOTICED TODAY BECAUSE
OF THE HUMIDITY. THE TSTORMS SHOULD DIE OUT TONIGHT. ON TUE THE
MONSOON MOISTURE DECREASES DURING THE DAY...BUT A LITTLE HANGS ON
WED AND EVEN THU...ENOUGH TO KEEP ISOLATED TSTORMS IN THE FORECAST
DURING THOSE AFTERNOONS. THE MARINE LAYER CLOUD DECK SHOULD BE
REBOUNDING A LITTLE BY THEN...BUT WILL REMAIN SHALLOW...SO THE
NOCTURNAL LOW CLOUDS WILL NOT BE EXTENSIVE. THE UPPER TROUGH OVER
THE PACIFIC NORTHWEST IS FORECAST TO EXTEND SOUTHWARD JUST A TOUCH
ON FRI...ENOUGH TO PRODUCE DRIER SOUTHWEST FLOW OVER SOCAL. THEN IT
RECEDES EVER SO SLIGHTLY OVER THE WEEKEND TO ALLOW A LITTLE MONSOON
MOISTURE TO SLIP BACK INTO THE REGION.

&&

.AVIATION...
042000Z...MONSOON AIR MASS FROM THE EAST IS MOSTLY KEEPING THE
MARINE LAYER WELL TO THE WEST OF THE COAST. MARINE LAYER STRATUS AT
1000 FT IS BEGINNING TO MOVE INTO THE EXTREME SOUTHERN SAN DIEGO
COUNTY BEACHES. EXPECT TO SEE SOME STRATUS AND FOG MOVE INTO THE
COASTAL AREAS TONIGHT BUT NOT MUCH FURTHER INLAND. CLEARING OF THE
STRATUS AND FOG IS EXPECTED BEFORE 17Z TUESDAY MORNING.

ABOVE THE MARINE LAYER...INCLUDING THE MOUNTAINS AND
DESERTS...SCATTERED SHOWERS AND THUNDERSTORMS ARE DEVELOPING IN THE
MOUNTAINS AND ADJACENT DESERTS WITH BASES AT OR ABOVE FL080...WITH
ISOLATED TOPS TO FL500 AT TIMES. OTHERWISE CIGS AND VIS WILL REMAIN
UNRESTRICTED. TSTMS SHOULD BEGIN TO DISSIPATE AROUND 03Z THIS
EVENING. PG

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...FLASH FLOOD WATCH FROM NOON PDT TODAY THROUGH THIS EVENING FOR
     APPLE AND LUCERNE VALLEYS-COACHELLA VALLEY-RIVERSIDE COUNTY
     MOUNTAINS-SAN BERNARDINO COUNTY MOUNTAINS-SAN DIEGO COUNTY
     DESERTS-SAN DIEGO COUNTY MOUNTAINS.

PZ...NONE.

&&

PUBLIC...MM
AVIATION/MARINE...PG

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